500hp & 600hp Bench Racing thread

273 said

Yes but by large amounts of just fine tuning opening and closing valve events and lsa ?

I would expect port shape needs to be slightly different also along with intake and exhaust lengths etc.. And stall gearing etc... All this stuff is inter connected so same would be relative term, cause if everything is exact same then it's gonna be mire optimal for one.

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If you can afford to fine tune those types of things on a 273, they'll pay bigger dividends on a 408. This is exactly what I mean when I say 'all things equal' - it means equal effort.

This is why your premise of 'the same parts' isn't useful in any case. What works for one is rarely the right choice for the other. The same level of effort though will reap greater power with a larger displacement.

Also, most hot rod parts are going to favor more cubes anyway. Building a high RPM screamer takes a more bespoke approach. It's not impossible to win with RPM, it's just not the type of program which can be described in a forum post.