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Old 07-16-2008, 12:02 PM
ScoTFrenzel ScoTFrenzel is offline
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I'm building a 400/400 right now with ported 915 closed chamber heads.

I don't think that stock open chamber 452's will do it. You need template porting and big valves. Modifications for valve lift will be necessary because you need as much lift as you can get. Stock rockers are fine up to .525. Most testers agree that the big valves without porting is a waste of time.

I suggest the new cams designed for Mopar lifters, roller preferred, solid roller the most preferred which requires a new valve train.
Something as mild as a Purple Shaft flat hydraulic 292/.509/108* I don't think will get you to your goal, but it is a nice street cam in 440s. (we run it in our long cross ram 440s) The LSA is most important. 112*and more sucks.

Pistons with a mild dome to fill the open chamber will be a benefit, keeping the compression about 10.0 for 91 octane.
You will also need a Performer RPM. Avoid single plane intakes.

I'd plan on keeping it under 6,000.
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