Lifter Preload??

[ghrarhg]

I'm getting ready to toss the cam and lifters in my 2.8. Lifters are here, cam should arrive early next week. I went with comp lifters, and according to the paperwork included with the lifters it say the preload is 0.002-0.004" (hot). From what I've found/read I thought the preload was much higher, like 0.020-0.040" and higher than that in some cases. Questions:

Should I go with the preload recommended by the lifters or the factory spec?

Is the factory preload really 0.020 to 0.040, or is higher like I've heard mentioned?

[34blazer]

I'm getting ready to toss the cam and lifters in my 2.8. Lifters are here, cam should arrive early next week. I went with comp lifters, and according to the paperwork included with the lifters it say the preload is 0.002-0.004" (hot). From what I've found/read I thought the preload was much higher, like 0.020-0.040" and higher than that in some cases. Questions:

Should I go with the preload recommended by the lifters or the factory spec?

Is the factory preload really 0.020 to 0.040, or is higher like I've heard mentioned?

hydraulic right? might be a typo on the cam card. if their hydraulic then 1/2 turn past zero lash

[geoffinbc]

Yea it should be .020 to .040 preload. 1 turn on factory studs and 1/2 or 3/4 on aftermarket 3/8" studs. .003 to .004 is hardly anything. The hydraulic plunger would be pushing against its stop the whole time possibly even breaking it.