Quote:
Originally Posted by spdbrake
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The video at the first link above is on a 400 CID SBC. The cams used (hydraulic flat tappet vs hydraulic roller) had the same specs, though the roller lifter had 0.053 more lift - very similar to the differences between the two cams mentioned by the OP. The results were pretty much the same up to 4,500 RPM, with the roller showing more torque and HP beyond that. The roller peaked at 6.4 lb-ft higher and 21.4 HP higher plus, of course, you have FAR less worry about wiping out lobes and you can run pretty much any
oil you want.
If it was me I'd go roller. The only reason I haven't already swapped out my hydraulic flat tappet cam so far is I haven't had the need (or desire) yet to open things up and make a change. When I do it won't be just for a cam and lifter change, it will almost certainly include heads and pistons as well, and perhaps an intake manifold - necessitating a larger / taller hood scoop as well.