Hydraulic roller lifter preload

[6T9QDA]

What is the acceptable preload range for LA hydraulic roller lifters? Much obliged.

 

[Dana67Dart]

What does the manufacturer say?

 

[6T9QDA]

The manufacturer is Chrysler, and I was hoping someone had the spec handy.

 

[crackedback]

Depends on what you are doing with it.

I set mine with 1/4 turn of preload, when spinning them up hard on RPM. Others put a lot more preload into them for street rpm use.

 

[Turbosmblk]

I do like cracked back. Zero lash and a 1/4 turn. Been 6900 on stock hyd roller lifters so far with no issue.

 

[mopowers]

I do like cracked back. Zero lash and a 1/4 turn. Been 6900 on stock hyd roller lifters so far with no issue.

What spring pressures do you run?

 

[crackedback]

What spring pressures do you run?

LOL They were some type of beehive on one. Went 6400, had some valve train issues and likely needed a correction kit. Eddy heads and crane 1.6 rockers.
I honestly don't remember... blame the heart drugs!

 

[Turbosmblk]

What spring pressures do you run?

Whatever came on Indy la-X heads.

 

[TT5.9mag]

Stock roller lifters have a very wide range. I’ve heard .015-.090 quoted all over the place, from Hughes to comp to Chrysler etc. the plunger has a LOT of travel. Doesn’t really matter where you set them is the opinion I’ve reached. I set em close to the top, IE 1/4 turn from zero. But you could probably set em 1/4 to 2 turns and see no difference in operation on a street car.

 

[MOPAROFFICIAL]

I've also heard stock mags were set at close to .090.
Springs and oil pressure will matter.
I've set them .030 on fresh performance builds I've done at 150/340 lbs, and up to .090 on top end upgrade deals on stock short blocks in trucks with 135/250 lbs stock magnum cam.

If you set them .090 with heavy Springs and an old tired bottom end with a worn out oil pump, you can end up running it solid lifter style when they bottom out LOL