Back4More

I too have replaced my lifters at just prior the 200hr mark and bought the higher rpm CompCam Pro Magnum lifters (#887-16) thinking they were better than the basic street lifter. Also reading the install sheet by chance and read about the 0-1/8 turn lash...???
Well as stated, I also have always done the 1/2 turn lash setting but did the 1/8 this time on these.
Have not had a chance to run the motors on the hose or in the water yet so I wonder who else has used the "high rpm" lifters at this setting and how it worked out?

Back4More

Did a bunch of searching on the web and found that a lot of CompCam ProMagnum lifter users found best result with 0 to just off 0 lash. So I guess the high rpm style hyd. lifters need less lash over regular lifters that like 1/2 turn.

FIXX

iTrader: (2)

Comp cam states that 1/4 turn is equal to .025..i don't believe in adjusting your lifters to 3/4 turn..you can only compress a hydraulic lifter .100 max then it turn into a solid lifter..lets say the retainer clip that holds the plunger comes out of the lifter,this will allow the lifter to pump up to its maximum lift capabilities and possibly allow the valve contact the piston..i have always used the 1/4 to 1/2 turn method so the lifter cant be pumped up the the max..This also allows the valve train to have more cush (between .050-.075),if you tighten them to 3/4 turn you will only have .025 of cush in the valve train..been dong it this way for years and never had any type of valve train problems..The more you preload the lifters the more they will pump up

Back4More

After more talk with other engine gearheads using these im going to re-set at just past 0 lash.

Griff

Comp says 1/4 turn for .025 preload, but Crane says 3/4 for .040. Merc used to spec at 1/2-3/4 for the HP500's. Exact results will vary depending on lifter geometry and the exact amount of preload needed will depend on the lifters being used. I have generally done about 1/2 turn, snug the poly lock and then another 1/8 turn using Crane products.

tmdog

I used the Comp. pro magnums #cca-875's on a sbc. I always adj. a 1/2 turn. Was amazed to read directions for 0-1/8 turn. Did the 1/8 and valve train is very quiet. Runs good too.

pslonaker

iTrader: (1)

Good luck...hope it works for you.

FIXX

iTrader: (2)

Wazz up jimmy how in the heck are you?

tmdog

Take your time setting valve tr. and adj. will work out. Good luck. Let us know how it works.

Back4More

I will. Got them re-lashed last night. Ran the oil pump and they are solid with no bleed down. I think just past 0 was the ticket.