When I was building my 408 I sent them to Ryan Johnson to be freshened, the valves were beat so he installed new 2.055" intakes and 1.600" exhaust, blended the intake bowl and did a 5 angle valve job another $1000. Until the next installment, enjoy the gallery below. I believe the trick flows are built more for higher end revs/power not low end torque. Being that you have a heavy 4wd, no need for full race type stuff. I ran them for five years on my 340, 7.24 @ 3240# with a hydraulic cam and on pump 93. What you don't see: a mess all over your expensive, ceramic-coated headers every time you change the oil. The cam Mike Jones spec'd for my 383 isn't that far off from those specs and this is for a 7200 rpm, 13.5, ported W2 headed, alky burner but I need torque off the corners at about 3500 - 4,000 rpms and Mike sez no dice on those big lift and duration numbers. No smog/emissions to deal with, so no cats on that 2.25 exhaust. I gave $700 for the heads, then sent them to Curtis Boggs. 115 is super light. This would also help in upping the compression with less chance of detonation than using the iron heads. I trust him. I assume your duration numbers are at .050? Part #: JPP 1194 At the base of the block, the dipstick will need to take a rather sharp turn away from the timing cover. Or you could try feeding your engine Extenze. I certainly started out thinking I would use my stock heads, they're 596 castings but I havent had them checked yet and am worried I'd spend enough money on these with new valves, springs and machine work when for a little more i can go with something like the edelbrocks, which I can get for a little more than $1k. Let it breathe. We did discover a few things that were not only important to the build, but not well known in the community. Which State Attracts The Most Sports Cars? That might be one reason the cam is a bit milder than would normally be considered for a 408" like that, it's more of a challenge keeping decent dynamic compression at ~5500 ft above sea level. With our Control Freak tubular K-member,the Milodon pan will just clear the Flaming River steering rack in the early B-body. We'll send you the most interesting Street Muscle articles, news, car features, and videos every week. The Fora platform includes forum software by XenForo, https://ramchargercentral.com/projects/pc1p's-1993-ramcharger-le-1ton-build/msg3540946/#msg3540946, My '74 Power Wagon I Ordered from Dodge on 8/73, http://www.immengines.com/indyimmironheads.html, Ramchargers, Traildusters, Durangos and other SUVs, Rams, Power Wagons, D/W 50s, Dakotas and other tru, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I will say I have been impressed with the torque. I agree with Hughes. We counted on Scat Crankshafts for our rotating assembly with custom JE Pistons. This article is to help others with our discoveries. The Trick Flows I have on my 2000 5.9 magnum engine use regular LA Rocker arms. So i can certainly go bigger if that is needed, but thought removing the cats and higher flow mufflers would still work since I'm not revving this to 5k RPM. What you dont see: five trap doors/gates, three deceleration gates, and two lateral gates to keep the oil near the sump and not sloshing around, all while holding six quarts of oil with better ground clearance. 3000lb car preferably. Upgraded Induction and Valvetrain Makes Great Power on our Small Block Mopar. Sure, some people are experts, but a cloud that looms over some of us has a slightly blue tinge to it from all the times we smoked our headers. Luckily, they let us have it for a great price. Cost: $175, $135, $135, respectively. We contacted a company that makes valve covers. Our 410ci Magnum gets supporting upgrades, including a bigger camshaft, better cylinder heads, and high-flowing induction. One look at Hughes Engines, and we found a main-stud girdle to help tighten up the bottom end. What you don't see: movement. Putting a 408 together, block is from a 02 Chevy 2500HD 6.0L Iron block. Cost: $64.95 from Summit Racing Equipment. Every head's HP potential is limited by the radius of the turn of the intake port to the valve as average port speed goes up in a pretty much linear fashion with power production. They can machine the caps down flush with the girdle for more strength and stability. He knew all my spring data before he made the cam, so not sure where those numbers came from honestly. For a better experience, please enable JavaScript in your browser before proceeding. Bore, Chevy, Each. The oil dipstick in LA engines is typically on the passengers side of the front timing cover. Did I read you correctly? Re: 400 inch sb with trick-flow 190 heads, Powered by UBB.threads PHP Forum Software 7.7.1. Given that LS1/2/3/&6 heads all come with 4.9" long valves, they all have about the same radius turn to the valve which limits the maximum speed air can turn the corner and therefore max HP. Subscribe to PN+ and watch all episodes commercial free. Like a stock eddie head valve spring. Many high-performance engines will run okay without one, but those with stud-mounted rockers will typically run better with the Jomar stud girdle. TTi focuses on the various aftermarket companies producing parts for Mopars by sticking with a specific marque. For Mopars, there are only a few. We used ARP polished stainless steel 12-point nuts and bolts to pretty-up our build. The design isnt just to route the tubes away from other components, the headers are designed to deliver the best possible performance. If you decide to give him a call, you might as well sit back with a cup of joe and be prepared for a series of fascinating stories of trial and tribulation about boat engines, horsepower, and the good old days! It also hurts on the top end as well, engines tend to wind out a bit earlier than normal at altitude. From: Jomar Performance Youll find references to Schumacher engine mounts, Control Freak Suspension, Edelbrock cylinder heads, et. Daily, PowerNation On The Road, Search & I ran them for five years on my 340, 7.24 @ 3240# on pump 93 with a hydraulic cam. Their improved flow characteristics and compatibility with the Chevy 1.6-ratio roller rockers that we received from COMP Camsmade them ideal. David Hughes told us, Ive had several customers with 700 horsepower naturally aspirated builds, and theyve been doing just fine.. The horizontal fittings as opposed to vertical give this filter mount a lower profile. Bore, .051 in. Worked okay, just weren't super impressive. And yes like kurt said dont choke the flow. Weve finally completed our 408ci stroker small-block Mopar build for Project Track Attack. The springs are rated up to .650 lift, which I will be under. In my street/strip Dart, 3260#, 10.8-1, 260/264, .633/628" flat solid with 4.10 gears it ran a bunch of 6.57's at a little over 104 mph on pump 93. We eventually found Dan Medice of Medice Manufacturing, in Cochranton, Pennsylvania. That's the "why". Although Mopar is in his blood, he loves any car that looks great and drives even faster. Your building a stroker. Garage, PowerNation It's so much nicer to mount the filter remotely where it's easier to change. What you don't see: damage from close tolerances. What you don't see: designed for flush mounting (preferred) or spaced, you want to send this girdle to the machine shop that is prepping your block. John tells us the benefits to the top end equate to a slight power increase. We opted for the stud girdle instead. They design all of their headers to be body-specific, meaning the collector flange is in a fixed location on every set of V8 headers they make. Our initial build was a slightly warmed-over street build. Info on my truck Too much going on here not enough space. (You must log in or sign up to reply here.). It does so without increasing the vertical limitations a lowered car will have. However I have no experience with the others, so I cannot compare. Connecting all of the studs together with the girdle eliminates that deflection and stabilizes the valvetrain. The headers are mandrel bent on CNC machines, meaning the tubes arent compressed where the pipes bend. We did a little mixing and matching, but werent exactly pioneers in the LA block/Magnum head build. Iron Animal Part 1: Building a 408 Stroker. It was highly recommended by Mopar enthusiasts to use a 1970-1973 block. Need to keep it on 91 octane and there are quite a few options for cylinder heads (Speedmaster, Edelbrock, trick flow) with the main differences (other than quality) being slight differences on the exhaust valve size and advertised runner cfm. What's The Perfect Amount Of Horsepower To Have In Your Street Car? Here is the cam card. We do something that has never been done before: build two identical 496 Big Block Chevy engines to run on the dynoat the SAME TIME!! I know someone looking at doing this, but I didn't know if it was worth the effort. Thanks! I notice the OP is in Denver, when I had my cam spec'd by Racer Brown (I'm in northern CO) Jim mentioned the lower air density kind of throws a wrench into the mix. Welcome to our site! I'll respond to what you mentioned in the other thread here. the cam depends on where he want's his power band, not something to give maximum high end hp and no torque curve, I have a stock stroke 360 thats barely over 10 to 1. Were expecting great numbers in the dyno cell for the 410ci Small Block Ford. I believe the trick flows are built more for higher end revs/power not low end torque. San Francisco Paints No Parking Zone Around Parked Car and Tickets It, Three Arrested After New Ford F-150 Raptor Pickups Stolen from Factory Storage, Woman Has The Perfect Response After Cited $6.7 Million Parking Ticket in Greece, PowerNation From: Hamburgers Performance Products Many of you know, changing your oil can be a mess if you have a Mopar small-block with headers. Some were difficult to find, and others were easy to find if you knew where to look. If you've got to ask, you don't understand. We got the same answer from everyone we asked: I dont know have them made. That wasnt giving us much confidence, but the stud girdles were installed, and we werent turning back. Milodon had the solution for us. Breathing is important, so we opted for Edelbrocks Magnum heads. However, we also heard that one used in conjunction with a main stud girdle is a bit of a pain and can be problematic, so we chose to stick with our original plan. Michael is a Power Automedia contributor and automotive enthusiast who doesnt discriminate. I gave $700 for the heads, then sent them to Curtis Boggs. We were able to loan our car to the team for test fitting of the Poly headers, so we were already familiar with the quality. What you don't see: gaskets squeezing out. the eddies are a great choice. After two failed attempts with an eBay dipstick tube, we succeeded with the Milodon unit in a few seconds. Please explain that to me. In 1966, a prototype for his own 1965 Corvette with a tired mill proved to be beneficial, increasing his RPM and performance and he contacted a patent attorney. Cost: $177.00 from Hughes Engines. Its ill-advised to expect your street cruiser to handle the punishment those trips to the track will dish out. Nice deal, but you could run lots more camshaft with that stroke and compression easily and cruise to your hearts content. We also liked the fact that many nut and bolt combos use different wrench sizes, like our engine-mount bolts, so we didnt need a matching pair of box-end wrenches. It would be nice to have the money for an R3 race-block, but the best blocks are either too expensive or too difficult to find. An open end wrench for leverage and a dead blow hammer made this a simple install. The unique attachment bracket allows you to clock the filter mount in numerous positions as well. The rocker arm stud girdles were a great find, but that lead us to clearance issues with the valve covers anybodys valve covers. I was able to get the exhaust kit made for the RC for $100 awhile ago, this was also when I was just planning on intake and exhaust rather than now going the whole kit and caboodle with the stroker. The rockers are Hughes 1.6's that I ground the pi$$ to clear the valve springs. Seconds on smaller ports for an engine that isnt going to rev high. It also ensures that your rocker arms dont budge, eliminating the need for constant valve-lash adjustments. We connect TWO 496 Big Block Chevy engines to the dyno to find out exactly how much power two of the same engine will make running in tandem! But both are great performing heads based on who owns which. I run Edelbrock on my 408 in a work truck. When I bought my used Edelbrocks the only other (aluminum) options were Indy and Brodex. We found a 1973 block from a friend in Dulzura, California. Different answer if you were talking port injection. Our builder suggested that we strengthen up the top end with a rocker arm stud girdle for this build. JavaScript is disabled. I have a stock stroke 360 that barely over 10 to 1. A stubborn oil filter can be difficult to remove no matter how careful you try to be. What makes this pan different from a standard deep-sump pan or a drag race pan is the baffling. Let it breathe. Can't tell you the difference between those heads, but I am plenty satisfied with ported stock heads for power on mine. I certainly started out thinking I would use my stock heads, they're 596 castings but I havent had them checked yet and am worried I'd spend enough money on these with new valves, springs and machine work when for a little more i can go with something like the edelbrocks, which I can get for a little more than $1k. ARP's 12-point design allows for a smaller wrench/socket size for tighter quarters, like our coated valve covers. This is the ticket for maintaining the duration your cam is rated at, because the rocker studs won't budge when the revs increase. We reached out to other builders, shops, manufacturers, and finally stumbled upon the solution. Exhaust Headers Yes@ 50. I am just south of Denver at 6,000 ft. Bandimere is around 5,800+. Iron Animal Part 2: Flow Bench Testing Heads. Will it run fine, of course it will, never said it wouldn't. Ok, thanks. IIRC they flowed 293 @ .600. The filter is directly above the secondary tubes, and the area is tight. My total duration is 308/308. Daily, PowerNation Rocker Arm Stud Girdles The rockers are Hughes 1.6's that I ground the pi$$ to clear the valve springs. One other area of importance to TTi is consistency: theyre consistent with the location and the clocking of the collector flange on every set of headers they make. It only made sense to go back to them for headers for the new engine, and that was for a couple of reasons. He does warn about over-camming an engine and using the girdle, suggesting to make sure the cam is right for the rest of the engine. As they say though, Rome wasnt built in a day and neither is an old-school Mopar. They say timing is everything, and for us, it was perfect timing. A 6-point nut required a larger socket size that rubbed, but the ARP hardware gave us better tool clearance, plus they're stronger and great eye candy. Follow along as we take a well used Dodge Ram SST and turn it into the tire fryer it was meant to be. Got back working on my set. Cost: $469.95 at Summit Racing Equipment. Those grooves are what Medice calls its GasketLok feature; as compression begins, the gasket 'locks' into place on the spacer and won't squeeze out, helping to keep oil inside. The girdles are very affordable, and is a wise addition if youre heading past the 400 horsepower mark. The big block TF heads were impressive right out of the box on a variety of engines so we were expecting a lot from the SB heads. 9 Forms of Friction: Raybestos Clutch Plates Explained, Going Against The Grain Pays Off For Mike Obermyers 68 C10, SEMA 2021: Turbosmarts Straight-Gate50 Is Redefining Wastegates, ARP Bolt Talk: What Is Torque Spec And Why Fastener Torque Matters. Youll enjoy the ease of changing filters once you go remote. Look at the dinky springs they tecommend for that cam. When the rocker arm opens the valve, compressing the spring, the stud is deflected away from the spring towards the pushrod., That deflection results in a decrease of effective 0.050 lift on valve open duration. From: Medice Manufacturing As with our case, swapping engines doesnt require having a new exhaust system fabricated, because we are already running TTi headers on the old engine. Bolt sets are available for many common engine families, in both polished or black oxide and with 12- or 6-point bolt heads. I gave $700 for the heads, then sent them to Curtis Boggs. Drag race pans have baffling to combat the sudden rush of oil heading towards the back of the pan at launch. 2022 Power Automedia. Milodon had the only true road-race pan we could find. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. So are these heads tons better than Edelbrock Performer RPM's? We would be remiss if we didnt mention another component thats renowned in the automotive world: ARP bolts. Do Not Sell My Personal Information -, By logging into your account, you agree to our, I'm not gonna get into TFS vs AFR because it's a never ending argument. Specials. Cost: $326.88. Oil Filter Relocation Kit On a budget no less! If you only race your car a couple times a year, you should still make sure to build it with that in mind. Some of these components arent exactly new discoveries to the Mopar crowd, but they were very trick components for us. This 400 based 512 inch stroker is all about power. Cookie Policy -
What you don't see: fitment problems. Block cleaned up at .040 over and I'll be ordering a SCAT rotating assembly with a (likely) 230/234 110 lsa Hughes hyd roller cam. A 340 build would have been better, but who can find a buildable 340 block these days? Plymouth Barracuda & Dodge Challenger Message Board Forum, Login with username, password and session length, In the immortal words of Jimmy Scott- "pace yourself! The girdle can mount in one of two ways: by machining the caps flush with the girdle (preferred) or using spacers. After a few months at the machine shop, the build was ready to commence. So i can certainly go bigger if that is needed, but thought removing the cats and higher flow mufflers would still work since I'm not revving this to 5k RPM. After about three months of empty promises, we decided to hit the internet again. So if I put long enough valves in my LS3/L92 heads I can get more power from them than from the LS7 heads? I have PRW 1.6 stainless steel rockers and mike from B3racing engines Geromity corection kit. It's not what you buy, it's what you build. There are kits available to convert to a four-bolt main, but drilling into the blocks lower webbing is rumored to weaken the block. Click the "ENTER THE GIVEAWAY" link for your chance to win the sweepstakes. Add the billet fuel-pump-cover plate on our Billet Specialties Tru Trac front drive system to the mix and youll have a very difficult time installing anyones dipstick tube.
IIRC they flowed 293 @ .600. How to turbo-charge an iron block LS stroker to make 1000 horsepower with a single 88mm turbo and air-to-air intercooler. Once you start the engine, a worrisome smell accompanied by smoke will cause your heart to skip a beat. I'm ordering up longer valves today. I'll respond to what you mentioned in the other thread here. 1 5/8 headers to dual 2.25 exhaust, 4.10 gears and OD trans. What that means is, every time we rounded a corner, we were met with unanswered questions. No complaints. One or two capsules a day might make it much more fun. BLOCK: 400 lo deck 512 ci, 2-bolt main With ARP main studs and billet main caps, CRANKSHAFT: 4.150" Scat forged crankshaft, CAMSHAFT: Hydraulic roller, duration @ .050: 245 / 252, lift: .565"/.565" 110 LSA (optional solid roller camshaft - add $750.00), TIMING CHAIN: 9 keyway adjustable billet double row, CYLINDER HEADS: Trick flow Aluminum CNC ported 270cc with 2.19" intake valves / 1.88" exhaust valves, By Performance Injection Equipment/MediaMekanik. I told them what I had, which was an LA360 stock with EDDY HEADS AND A cast intake 4 barrel, the first thing he told me was he was surprised I splurged on the heads but not the intake, but is also not surprised as the stock intake actually flows pretty damned good. A few times at Willow Springs we noticed the oil-pressure gauge dancing on the lower psi readings during hard cornering. With the flexible braided sleeve of the Milodon unit, we simply used an open-end wrench for leverage and tapped on it to drive the end of the tube into the block. He charged $1100 to port, do a 5 angle valve job and mill them to 55cc chambers. Part #: HAM-3373 570rwhp, I think you just convinced me to sell my l92 stuff and switch to tfs. I appreciate the feedback. All rights reserved. Part #: TTi 340BE-C4 Weve been told that a windage tray is a nice addition. Road Race Oil Pan Part #: HUG 7382K When it comes to headers, you can probably find a dozen or so headers for a SBC. All rights reserved. Dan was just finishing up his Magnum valve cover spacers, CNC machined from 6061 billet aluminum. John said, In virtually all engines with a stud-mounted rocker system, the rocker-arm stud is inclined towards the valve stem. A few drops of oil will collect around the tubes just before the collector, making it near impossible to clean up. He charged $1100 to port, do a 5 angle valve job and mill them to 55cc chambers. of torque! The air here sucks for racing due to various oxygen and density variables. Main Stud Girdle My personal opinion of Dave Hughes, I wouldn't piss on his head if his hair was on fire. You might think $840 is a lot for headers, but a custom set will run you even more to get this quality. We asked if its always necessary, and he did say that mild street engines will seldom benefit from a stud girdle. No smog/emissions to deal with, so no cats on that 2.25 exhaust. Below, well share some secrets and tips, in case you decide to perform a similar build. ", Linkback: https://forum.e-bodies.org/engine-transmission-and-rear-end/4/best-heads-for-a-408-stroker-magnum/8239/, Re: Best heads for a 408 Stroker (Magnum), Quote from: Chryco Psycho on August 27, 2018, 10:49:26 PM, Quote from: Chryco Psycho on August 30, 2018, 12:56:42 AM, MOVED: Best Alum, heads to use on 408 Stroker. From: Milodon That includes 1967-1973 cars with later K-members. This Small Block Ford receives big power upgrades. Enter Our Dog Days of Summer BBQ Giveaway Now! Were not interested in launching on a sticky track with sticky tires, at I cant hear you RPM. .. this just in "don't choke the flow". what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-14-20_819415, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-14-14_050416, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-14-07_184316, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-13-59_093362, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-13-52_787005, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-13-46_307210, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-13-39_751414, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-13-32_891436, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-13-25_939191, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-13-19_559707, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-13-12_416353, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-13-05_991754, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-12-59_064216, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-12-51_495657, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-12-44_197889, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-12-37_180901, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-12-30_023118, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-12-22_433202, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-12-14_745409, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-12-07_533137, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-12-00_220388, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-11-53_467631, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-11-47_013669, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-11-41_114454, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-11-34_604318, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-11-27_805341, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-11-20_979628, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-11-14_229153, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-11-07_816361, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-11-01_375899, what-you-dont-see-tricks-behind-our-408-stroker-small-block-build-2019-05-27_15-10-48_858352. al. We ran an early set on the dyno on a mild 408 and they didn't do anything great. TIA. We crank up the power on our old-school GM 4.3L V6 with some turbocharged forced induction. Were not just about numbers here were about driveability and usefulness. Yellow Fever Black Magic (Rislone Mustang), Assembly Lubricant, for Engine Assembly and Fastener Installation, Ultra Torque, 1 Pint, Each, Bolts, Hex Head, Chromoly Steel, Black Oxide, 8mm x 1.25 RH Thread, 30mm UHL, Set of 5, Head Gasket, MLS, 4.080 in. Originally focused on the Ram Charger / Trail Duster, our members own, drive and wrench on Mopars from the 40s to the current day. That is one reason my power curve may be lower and flatter than most. That was too costly, so we contacted a local company that already had the Magnum pattern. Stainless Steel Oil Dipstick 1988 Ramcharger LE 150 318 TBI 727 non-lockup. Springs, Ti-Retainers, GM LS3, Each, Timing Chain and Gear Set, Double Roller, Billet Steel Sprockets, Chevy, 4.8, 5.3, 6.0, 6.2L, 3-Bolt, Set, Timing Chain Dampener, Plastic, LS2/LS3, Non-VVT Engines, Includes Adapter Bracket, Kit, Piston, Pro Tru, Forged, Dome, 4.030 in. Its impossible to run a tube straight into the opening the tube needs to snake around the front-drive components. We arent the first ones to use these parts, but we had to find a solution on our own. My point is he with zero doubt left a good bit of power on the table with that small of cam. All of them are what helps make our build a little unique and ready for the track or our next trip to Vegas. What you don't see: two failed attempts with a solid tube and not getting the bend just right to clear the new front drive components. The following errors occurred with your submission, LS1TECH - Camaro and Firebird Forum Discussion, Poll: Pick the best HP/TQ Heads for my 500+HP 408CI Stroker, Gen 5 Camaro Tuning, Diagnostics, Dyno results, Hot Rod Power Tour/ Pump Gas Drags/ Drag Week. When I was building my 408 I sent them to Ryan Johnson to be freshened, the valves were beat so he installed new 2.055" intakes and 1.600" exhaust, blended the intake bowl and did a 5 angle valve job another $1000. In other words, we arent concerned with living our Belvederes life ten seconds at a time. We do plan so see some high numbers, but well leave the 1,000 horsepower to the braggarts.