01-18-2008, 11:05 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Like Chaplin said, you have a lot of experienced guys in this thread....one that used to work for a BIG name automotive supplier and now runs his own business dealing with engines...and several others who have been around the block a time or two. This isn't really an opinion issue. It's more of a "this is how you need to do it, no questions asked" type of issue.
A couple of things that I'm seeing:
1. You're gonna need an awfully big cam to get a 498ci FE to rev the way you want. To get 498ci to make power at 6500-7000rpm, my guess is that your duration at .050" would need to be in the 260-270 range, if not higher.
2. If you're using said cam, you're gonna need some awfully big valve springs to keep everything in check. With that much valve spring pressure, I really, really, really think you need to remove the inner springs.
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