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Old Mar 14, 2007 | 08:46 PM
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Question pushrod length ?

Got some new heads and was checking for pr length, my pr length from the checker is 7.266. If I pre load the lifters .042, you get a 7.308. I have 7.300 and some 7.350. Which ones do I use?? It is kinda hard to adjust the the checker while in the head so I had to keep taking the rockers off to do so. The first measurement was a 7.262 and then I remeasured and then got the 7.266. So it's somewhere close in this range. The rocker barely lifts off of the valve stem but I think I'm pushing the down on the lifter.

What ya'll think....????

James
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Old Mar 14, 2007 | 08:47 PM
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You want more preload than that, try more like a .075 preload
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Old Mar 14, 2007 | 09:08 PM
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So use the 7.350's???? If I use the 7.350's, the lifter's will pre-loaded @.085. I guess this is too much??

James
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Old Mar 14, 2007 | 09:35 PM
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Originally Posted by closet red neck
So use the 7.350's???? If I use the 7.350's, the lifter's will pre-loaded @.085. I guess this is too much??

James
No thats not too much preload. i believe .100 is the max preload you would want IIRC.
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Old Mar 15, 2007 | 09:39 AM
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James

What lifters are you using?
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Old Mar 17, 2007 | 08:46 PM
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Originally Posted by Viper
James

What lifters are you using?
Sorry for taking so long on getting back to you guys, the lifters I'm using are the GM High Performance lifters. The LS7 lifters.........they cost $217 off of Scoggin's. I measured on the heel side of the cam with pr checker. Mic'd this and then I need to add .060 of preload to the pr checker length. I think .042 is the were the most power was made but in everyday driving, .060 is good. I'm running the Edelbrock cnc'd heads.

James
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