Cam Lobe Base Circle Sizing
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
I did not see anything on base circle sizing for the different comp lobes, thats why I posted. Sorry if I missed it but does anyone know specifically if XFI lobes on a stock ls1 longblock would be 7.400" pushrods?
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Always measure, and theoretically all aftermarket cams require longer pushrods because they start as stock cores, they are regrinded, and re-hardened. Meaning they all should have smaller then stock base circles.
According to Comp tech lines they say that they definitely preach measuring but most stock ls1 engines will be 7.400" for cams with lift less than .600 and 7.425" for cams with above .600.
Consider this....how do you expect to install a cam with such a high lift with a stock base? It wont physically go in the engine without a smaller base.
Don't listen to anyone about PR length, you have to check your self for your engine. I'm sure we all get sick of engine problems related to PR length or the questions asking...
Don't listen to anyone about PR length, you have to check your self for your engine. I'm sure we all get sick of engine problems related to PR length or the questions asking...
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