I know its beat to death, but there is so much debate on LS7 lifter preload. I would like to hear from a legit engine builder or vendor please. I measured my push rods today.

Length checker is 6.8" closed

I turned it out 12 times to match my 7.4 push rods.
Closed it down two turns. (7.30") perfect
10 turns to close = .500 6.8+.500=7.300 .100 preload is 7.400

Is .100 good for a street car? I drive it on the weekends and track it about 3 times a year. I've read .050-.080-.100, is there no real answer?

1997 Corvette
GM 5.3 heads bronze guides
Comp cam 228/232 .588 .592

 

I am no master engine builder, but from what I have seen here, people try to hit between .050 and .090 inches of preload for stock lifters.

 

I know they are gone now but Crane did a lot of dyno testing and they determined that .060" was the optimum preload.

 

Thanks guys.