SBM Roller Lifter Choice
Wow I got a response from Comp
Lobe numbers
Intake - 3015
Exhaust - 3036
THANKS I'll look up that grind in the online lobe list catalog
Found on the Extreme XFI intake page 23 and Exhaust p 24
Intake is 149@200 Intensity is MI 26.6 with 13.1 opening and 13.5 closing
Exhaust is 147@200 MI 27.3 13.4/13.9 intensity should be .006<.050>.006
so far so good
What's interesting is Comp does not use the BBC/ MOPAR size base circle
but uses a base circle smaller than SBC- what we used for stroker SBC's
Why?
one reason might to be to try and get a little more action off the seat/ less side pressure on the lifter
sort of a kludge inverse radius
but there are tradeoffs
smaller base circle requires different pushrods
maybe a different roller lifter
so check it out
no reason that a roller has to be the same base circle as a FT
we used a really small base circle on the 4 1/4 stroke chevy
however I usually like the cam core and base circle and the roller to be as large as possible - again tradeoffs
oil bands can be uncovered at both the bottom but more usually at the top of the lifter bore
this may be a "one size fits all" cost savings or be a great feature IDK
READ THE DESCRIPTION in the Comp Catalog
COMP Cams Lobe Catalog pg 23 and see if it matches MOPAR and/ or your build