Cam Swap
02-08-2010, 12:36 PM
#1
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Join Date: Feb 2010
Location: Indiana
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Cam Swap I am getting ready to change out the cam in my LS1. I need to know if I need shorter push rods. This is the comp cam I am using-RPM range: 2,000 to 7,000 rpm. Duration at .050" lift: 224/230 (int/exh) Valve lift with 1.7 rockers: .581"/.588" (int/exh). You input would be greatly appreciated.
02-08-2010, 01:09 PM
#2
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Join Date: May 2009
Location: Central Florida
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If your heads haven't been milled then you shouldn't need shorter pushrods. If your cam doesn't have a smaller base circle than stock, you shouldn't need longer pushrods. A pushrod length checker is cheap insurance in any case.
02-08-2010, 03:30 PM
#3
Whoever ground/sells the cam (Comp) would be able to tell you a whole lot more than most people here.
Comp will be able to tell you if the base circle is smaller or not, and just like ^ said, as long as the heads arent milled than they shouldnt need to be shorter.
Comp will be able to tell you if the base circle is smaller or not, and just like ^ said, as long as the heads arent milled than they shouldnt need to be shorter.
02-08-2010, 03:34 PM
#4
measure to be safe. The checker is like $20.00 bux. I bought one, would let you borrow if you were closer. I don't see why shorter though, you never mentioned the heads being touched, just the cam. Usually the base circle is smaller, which would lead to a longer rod. Also, sometimes, depending on the cam grind, lifter preload preference, and manufacturer, sometimes to have it 100% perfect, you may need (2) different size lengths for intake and exhaust. I know that should be the case of my MS4, but thats a much different cam.
