closet red neck

iTrader: (6)

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

brad8266

iTrader: (23)

You want more preload than that, try more like a .075 preload

closet red neck

iTrader: (6)

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

brad8266

iTrader: (23)

No thats not too much preload. i believe .100 is the max preload you would want IIRC.

Viper

iTrader: (6)

James

What lifters are you using?

closet red neck

iTrader: (6)

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