compblower cam and pushrod length
Thread Starter
Teching In
Joined: Dec 2004
Posts: 9
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compblower cam and pushrod length I got some great info from Vettenuts over on corvetteforum, but before I install my new pushrods, I have a question about the length.
I put in ported 243 heads and a comp cams blower cam. The valves were oversized, so they are not the LS6 hollow/sodium filled valves. When measuring with a comp cams pushrod length checker, 6.800" - 7.800" I turned it 9.5 turns to where the rocker was not tickig on the valve stem, but no pressure on the lifter. That gave me a length of 7.275. I then added .100 for lifter preload for a total of 7.375".
My question is why do I calculate a shorter than stock pushrod? it is my understanding that the base circle for comp cams is smaller than my 97 LS1 stock cam.
Any thoughts?
I put in ported 243 heads and a comp cams blower cam. The valves were oversized, so they are not the LS6 hollow/sodium filled valves. When measuring with a comp cams pushrod length checker, 6.800" - 7.800" I turned it 9.5 turns to where the rocker was not tickig on the valve stem, but no pressure on the lifter. That gave me a length of 7.275. I then added .100 for lifter preload for a total of 7.375".
My question is why do I calculate a shorter than stock pushrod? it is my understanding that the base circle for comp cams is smaller than my 97 LS1 stock cam.
Any thoughts?
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Are your heads milled? Which gasket are you running.
What are the cam specs (lobes)
22lbs/ft is your trq on rockers, that has to be done on base of cam lobe. 2 turns sounds like your p-rods are too short.
What are the cam specs (lobes)
22lbs/ft is your trq on rockers, that has to be done on base of cam lobe. 2 turns sounds like your p-rods are too short.
