ok so i have a am wondering if any of you guys know of how much power i am lossing beacause ive got the car in my sig. and it has 1.6 rr sa pro mags, and stock lifters,pushrods,and when i set them i set them zero lash then a turn & a 1/4 (because thats what ALL DATA said to do)NOW i have driven the car about 1000 miles and runs fine,until yesterday i got it up to 6000rpm and i compressed a lifter and they only have 15,000 miles on them so i have now ordered comp lifters and chromoly push rods but i would like to know if that would cause a huge power loss haveing them to tight. Ohh and i will be setting the new to zero then 1/8-1/4 wich ever you guys recomend> THANKS

 

I usually tighten my rockers until the pushrods stop spinning easily... then put just a 1/8th turn or so.

 

1-1/4 is way too much. There would be no way to judge power loss. 1/2 turn would be fine for stock lifters.

 

What rocker studs do you have, 3/8-20 or 7/16-20?

One an a quarter turn should not hurt you with either as the factory recommended preload is 1 turn for 3/8 studs and about 3/4 turn for 7/16 studs. With Comp R's it's a different story. Use the preload that's recommended by Comp.

I've run 1.5 turns on lifters in my 1985 TA and had no problems. The maximum travel on a stock 1997 LT1 lifter is .148". This is 3.5 turns with a 3/8-24 stud and 3 turns with a 7/16-20 stud. Not that it's best for performance, but I don't see how 1.25 turns would hurt anything.

 

I believe that the factory spec is 1 turn + or - a 1/4 turn. With that said most people run about a 1/2 turn on stock replacement lifters.