goinbroke

I installed the comp r lifters before i knew of all of this preload stuff. On my new heads, i just want to do the 22ftlbs on the rockers and be done with it. I will be running comp 977 double springs and want to know what lifters to use? Like i said, i just want to tighten the rockers down without all of the preload crap. Any suggestions?

SPANKY LS1

iTrader: (24)

Comp 977s require Comp "R"s, there is no way around it unfortunately. The seat pressure dictates the use of these lifters because the stockers will collapse. Either have to shim them to get the preload right (PITA) or get some adjustable rockers ($$$$).

Shawn

goinbroke

what about comp 987 springs?

SPANKY LS1

iTrader: (24)

987s can use stockers, I had them on my old TEA heads with a 230/224 and stock lifters, worked fine.

Shawn

goinbroke

Are there any replacement lifters besides stockers that can handle the 977's? By the way thanks for all of your help.

SPANKY LS1

iTrader: (24)

Yeah, Comp "R"s.

Country Boy

iTrader: (24)

With the 977s, youre stuck with the Rs.

goinbroke

Everybody has a different story. Shimm them, adj. rockers, and bolt them down to 22ftlb and your done. So wich one is right?

SPANKY LS1

iTrader: (24)

Shim them or run adjustable rockers. Simply torquing to 22 ft lbs is not an option.

Shawn

goinbroke

Any info on how to do this?

BLUEBALLS ZZ

iTrader: (2)

someone explain why we are pre loading a hydraulic lifter? self adjusting is why they are hydraulic not a solid lifter. that was the whole purpose of that hydraulic design

goinbroke

Good point.

goinbroke

I beleive Lg and TEA say you can just bolt them down to 22ft lbs and be done with it.

Country Boy

iTrader: (24)

Same reason you still adjust a SBC lifter eventhough its hydrolic. Youre putting tension on the piston inside the lifter. Too much tension and the lifter cant do its job. If youve ever tightened a lifter too tight, youd know why preload is important. Its not like its solid. Its hard to explain Hydrolic lifters arent self adjusting.

BLUEBALLS ZZ

iTrader: (2)

they are in a way. you are right. to much you will keep the valve open. and to little you will lose lift and have a noisie valve train. sbc did it. but olds and pontiac motors didn't back in the day when they had thier own motors. just tighten down and your done. you still have a rather large area for the lifter to adjust to. maybe the comp R's have a smaller area of travel with in the lifter. that would make sense btw. i have your old nitous tnt kit still on my car. bet you wonder where that kit went huh

2xLS1

iTrader: (25)

All preload on a hydraulic lifter does is position the piston in the lifter bore. Oil under pressure supports the lifter piston and maintains 0 lash in the valve train. You can say they self adjust to maintain 0 lash.

BLUEBALLS ZZ

iTrader: (2)

nice way to explain it

Nasty N8

iTrader: (33)

Shimming the rockers is not that difficult to get it right it just takes some extra time.

Nate

Cstraub

iTrader: (1)

I will find out about Morels hyd. lifter for the LS1's and what has to be done. The lifter is done with testing and should be ready for the market. If they're protoype of the LS1 lifter is anything like the one for Fuel Cars, it will also win an NHRA Championship.

Stay Tuned:

Chris

Mike 01WS6

Can you run the 987's on a t-rex cam? Or do you have to run a 977?