Maximum Performance N/A 383 build. Input wanted from engine gurus.

67charger383 said
For the engine gurus:

My current project to build a maximum performance B block 383 with the goal of using a stock block. Money isn't really an object but I want to keep it to mostly not one off parts.

Engine Specs:

0 deck 30 over 383 block
forged rods and crank
TRW L2293 Dome Pistons
Super Damper
Fully race prepped 452 heads with near max wedge size intake ports
Harland Sharp 1.5 rockers
Mechanical Roller Cam
Lunati Mech Roller Lifters
Milodon Gear Drive
Milodon External Oil System
Fabbed aluminum oil pan with a crank scraper
Ported Weiand 2x4 Tunnel Ram
2x Holley 750 Double pumpers
Hooker Super Comp Headers
Accel BEI II Ignition



Car Specs:

67 Charger body
4000lbs with driver
Fully built 727 (kevlar clutches, RMVB, deep pan)
Turbo Action 5000 stall converter
8-3/4 Sure Grip with 4.11 Yukon gears
28' Tall tire


Yes I know it is a heavy car with small cubes. The goal is to go the fastest with an all steel 67 charger body with an Iron 383 block and stock stroke N/A.

Well anyways, I called up a few cam companies today to spec a custom grind mech roller, and they all told me to make the heavy car with small cubes combo work I would need to be turning 7500-8000rpm. I was then told that I really should get Trickflow 240 heads, H beam rods, and more modern lighter dome pistons. They told me that the TRWs are too heavy to run that type of RPM, Is that true? I know alot of SS guys ran them back in the day... I was also told that I could make the combo of Iron heads and TRWs work if they flowed around 290-300cfm. The cam specs I heard from multiple sources were: 280/280@50 680 Lift 110 LSA

So I have a few questions for any engine gurus here:

Can I turn 7500+ Rpms with the TRW Slugs? I already have the full rotating assembly balanced and blueprinted.
If so can I run them with TF 240 heads, or would there be piston-valve clearance issues?
Is it possible that the worked iron heads flow around the 280-300cfm range? I have big $$$ into them but for the price of getting them on a flow bench it wouldn't be worth it. I was quoted $500 to flow test them.
I will most likely go for the TF 240 heads.
Any recommendations for a modern lighter dome piston that would put the compression at roughly 13-1?

What needs to be done to prep the block to handle these high RPMs?

Can forged stock rods and stock hardware handle 7500? or am I stuck with having to get H beams and full ARP hardware?

I would appreciate any input or further recommendations.
Click to expand...
The parts you have are not "max performance" anymore. That might have been a max performance build in 1975, but it isn't today. Just call it "old school" and roll with it. Sounds like you have all the parts except for the cam. PRH can get you the best cam for the combination so talk to him. If this is drag race only with open headers then the cam can be fairly radical. Cast iron heads are pretty crappy in terms of flow so those old engines had a ton of cam duration. Old engines need completely different cams than newer engines with Trick Flow or Indy heads so you need to talk to someone like PRH who understands the difference. I'm not sure that you can make 600 hp with your existing heads. A good set of NHRA legal heads will make that kind of power but those heads are super expensive. You'll just have to put the combo together and find out how good it is. Nobody on here will know anything about it since we have no idea how well the heads have been ported.