Push Rod Length
Push Rod Length I just installed a LPE-gt2-5 222/222 .566/.566" on a 112lsa and i do not know what the base circle is of the cam to see how it compares to a stock cam. I put the stock rockers and pushrods back in the engine and spun it over to make sure there were no piston to valve problems. The sweep of the rockers looks to be alright on the valve tip but i'm not sure if the stock pushrod length is acceptable and how relible it is?
Originally Posted by 50chevy
I just installed a LPE-gt2-5 222/222 .566/.566" on a 112lsa and i do not know what the base circle is of the cam to see how it compares to a stock cam. I put the stock rockers and pushrods back in the engine and spun it over to make sure there were no piston to valve problems. The sweep of the rockers looks to be alright on the valve tip but i'm not sure if the stock pushrod length is acceptable and how relible it is?
Originally Posted by 50chevy
Ya, they are the stock heads #706 on a 2001 5.3L
So let's say you were running an F14 cam and milled the heads .007 and then dropped in a 43" head gasket...would 7.400 PRs work?
Looks like my base circles are 1.450. The above configuration would put the valvetrain .018" closer to the lobes.
Looks like my base circles are 1.450. The above configuration would put the valvetrain .018" closer to the lobes.
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Originally Posted by orangeapeel
Would that be an MLS or cometic?
I have an OEM MLS for measuring PtoV and I'm hoping I'll be able to get away with the .043. I was looking at SCE Titans as I can drive to Summit Racing and pick them up. I've heard Cometics have looooooooong lead times.
What about Fel-Pro or anyone else?
(Sorry to jack the push rod post)
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Verdad Gallardo Im not a fan of the FEL Pro personally. I have used MLS gaskets everytime and they have worked great. I have seen some pansy setups blow head gaskets that were fel-pro'd...
Plus I believe that this thread is answered for the most part.
Plus I believe that this thread is answered for the most part.
Originally Posted by orangeapeel
Im not a fan of the FEL Pro personally. I have used MLS gaskets everytime and they have worked great. I have seen some pansy setups blow head gaskets that were fel-pro'd...
Plus I believe that this thread is answered for the most part.
Plus I believe that this thread is answered for the most part.
TECH Senior Member
Joined: Mar 2004
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From: BFE
Originally Posted by SUX2BU
Yeah most aftermaret cams are .100 smaller on the base circle. so to keep the stock lifter preload you would need a .050 longer pushrod. but many people have run stock length pushrods with aftermarket cams for years with no problems. if you want it to be perfect get some 7.425 PR. they actually mic out to 7.440 so you would be .010 away from stock preload.
It all depends on the lobe used and the lifts.
Best way is to measure the Base Circle and go from there.
