*ESTIMATED duration at 0.006 inch tappet lift = 278°/280°
Duration at 0.050 inch tappet lift = 224°/226°
Gross valve lift at 1.73:1 rocker arm ratio = 0.578/0.571
LSA = 115°; overlap = 49°
As per the dyno sheet this engine is churning out 539 horsepower peaking at 7000 rpm. The original claim was that this engine is equipped with this Comp Cams Weber Cam. If so it is further proof, if any is needed, that a Cleveland with 4V heads does not need long duration or lots of overlap to make plenty of horsepower or to rev at high rpm.
quote:
Originally posted by René #4406:
115 ° lobe separation, it seems to me that this is the value George recommends for a street engine?
René I used to advocate 115° LSA, but in the last few years I've switched to recommending 114° in the hope that folks will encounter less resistance from the cam grinder. There are still folks at Bullet Cams who contradict the cams I pen, claiming they won't rev as high or make the horsepower I say they will. Despite their claims for being familiar with the 351C 4V, they obviously aren't. If you're going to get a cam ground to specs like these, a person has to be capable of standing firm with the cam grinder.
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