comp 975 lifters
Are you sure it's a 975? Maybe an 875 instead??
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Thread Starter
On The Tree
Joined: Aug 2010
Posts: 108
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From: Mesa,az
I checked the pushrod length an got,almost 1.5 turns.then checked with a dial indicator,and got about .070 ths.this cold on the engine stand.buddy of mine built a ls3,with far heads,same lifters,060.preload,and 7.4 pushrods.6k on motor with no problems.what do you guys think?
If you've got the 875's, you need an adjustable rocker to setup preload properly! They require .002-.004" of preload, otherwise you'll have problems (noise just being one of them).
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Verdad Gallardo Yes, some get away with a stock rocker on the 875 lifter combos....but you have to get VERY close on the preload to start, and then you shin them to get the preload where you want it. The issue with that is you start messing up your geometry just to get the right preload, which is no better than having the wrong preload to start with!
If you search on here, you'll find a few people who have been successful with the stock rockers using this method, but 99.5% of them will complain of loud valvetrain noises and/or instability, and then having switched to an adjustable rocker.
If you search on here, you'll find a few people who have been successful with the stock rockers using this method, but 99.5% of them will complain of loud valvetrain noises and/or instability, and then having switched to an adjustable rocker.
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Thread Starter
On The Tree
Joined: Aug 2010
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From: Mesa,az
Darkman,I noticed most of those post,were in 04/05 years.did comp fix the problem?I checked with a pushrod checker and 7.300 will give me the right preload cold.I'm running a big comp cam 474-11,251/267.624 lift.the motor is not in the car yet.pushrods are cheaper than lifters.
Darkman,I noticed most of those post,were in 04/05 years.did comp fix the problem?I checked with a pushrod checker and 7.300 will give me the right preload cold.I'm running a big comp cam 474-11,251/267.624 lift.the motor is not in the car yet.pushrods are cheaper than lifters.
The pre-load range is from 0.002-0.004 inch. (One poster above misstated it.) You cannot establish a pre-load level within plus/minus two thousandths of inch using a pushrod checker nor can you measure it based on the number of turns on the OEM rocker.
The simple fact is, if you do not have an adjustable valvetrain you cannot set and maintain these lifters to the manufacturer's specifications. Thus you cannot expect them to be reliable.
Precisely. Well stated.
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