Pushrod Length...
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Launching!
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From: Hudsonville, Michigan
Pushrod Length... does 25/1000ths of an inch (1/40th) really make that big of a difference? i thought we had self-adjusting lifters?
i'm about to put my cam in and i don't know whether to get the 7.400" or 7.425" pushrods. input please....
243 ls2 heads. torquer2 cam (232/232 .595" .598" 112LSA)
i'm about to put my cam in and i don't know whether to get the 7.400" or 7.425" pushrods. input please....
243 ls2 heads. torquer2 cam (232/232 .595" .598" 112LSA)
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Launching!
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From: Hudsonville, Michigan
pushrods i would measure. i bought a engine off the forum used. the engine didnt pull past 6000 and cam was good for 6600. since i new all my springs were new since i just freshend the engine i did a compression test and had 170psi. which was a little low. so i backed the rockers off to zero lash and then had 200psi. becuase the pushrods were to long with the stock non adjustable rockers the lifter has too much preload and was hanging the valves open.
-i would measure there are factor like have the heads been milled and what gasket it all adds up.
-i would measure there are factor like have the heads been milled and what gasket it all adds up.
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This is how I do it assuming stock lifters which are forgiving to some degree. Something like Morel needs a bit more accuracy because the preload range is much smaller.
Link
Link
Thread Starter
Launching!
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Joined: Dec 2004
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From: Hudsonville, Michigan
this is what i got after setting the adjustable pushrod to 7.400" and testing on 2 valves checking the wear pattern. ....but this is an incorrect way to check??
This is a shaft mount system, you cannot measure length by checking the wipe pattern. Your method is for a standard SBC. Since you have no adjustability, you need to change the pushrod length in order to get the lifter pre-load right. The method I showed above, or the method Vettnuts listed are both very easy, and pretty accurate.
There is a way to check the wipe pattern with the heads on the car, but you would need to install check springs. Photo's are kind of blurry but the pattern appears to be to the exhaust side. Then again, it may not be correct because of the way it was measured.
