Quote:
Originally Posted by MOTORHEAD
Thanks to all for your input. The Hot Rod tests show the basic differences I was wondering about.
Now for the rest of the story:
When I built this engine I was camming it for Webers, and asked Barry Robotnik for his opinion and he got me a Comp hyd roller with 112 LSA, which worked well with the webers, but I had what turned out to be a sealing problem at the port head/intake junction. As a last resort,I took off the webers and manifold and installed the original holley and manifold, and it runs just fine, been using that set up for quite a while with no problems, just wondering if I was losing power by keeping the "weber" cam with the 4 bbl set-up.
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Too many variables to say. You'd have to pick apart each cam timing event separately.
I will say this: camshafts revolve around overlap. If you have too much overlap for a given displacement/cylinder head/rpm combination, then the engine will be terribly inefficient and power will be lost. Hydraulic rollers for large displacement engines typically have large advertised durations, which increases overlap. Going to a shorter LSA may hurt things. Just depends on the entire combination and the camshaft specs.
There are no general rules.