Zero? Really Griff?
The Gil's have those siameased center ports. The CMI's gotta make a difference.

I was supercharged and SC'd engines really don't need as good of exhaust to still make the same power. They compensate with boost. I replaced the Gil's due to cracking and went with CMI Unitops. They are an 1 piece E Top. I didn't gain anything.

You will have spin the engine at about 5800rpms with a 741 to reach peak HP in with 454. A 731 will make more power and torque at lower rpms, probably around 5400 and have a better torque curve.

I want a dyno and just make pulls all day long!

I've got (2) 731's with low, low hours I will sell for cheap.

Ed

fandango
What do you have for them? Just cams or other valve train for sale too?

Griff
Will the 741 work in my 2000 500EFI's and what if any improvements will I see? I plan on doing head work and reprograming the ECM but wandered about switching the cam
Thanks Steve

Formula377,

I have two sets of Comp Cams roller lifters I am willing to sell They have low hours and are in great shape. They are for Mark IV and Gen V engines.
Let me know if you are interested.

It should work fine. You may want to go with the 525EFI cam instead. Its a 741 ground a 114 lob sep instead of the standard 112. It'll idle a little smoother and probably have a little flatter torque curve.

Just make sure that whoever does the ECM knows exactly what you have. It may be easier to use a known combo by one of the reputable builders.

fandango, email me a price and some contact info [email protected]