[soupman]

I have a set of PRW stainless 1.65 rocker arms currently on the engine. They seem fine, engine runs fine, but I found a set of Crower enduro 1.65 rocker arms in my garage I must have bought 15 years ago and forgot about them. I want to swap them out and put the Crower on . Is this straight forward swap, not need to change the pushrods?

[steve25]

It’s a straight up swap, and I don’t blame you, as I would feel better when the pedal is to the floor with those Crowers on the motor also then the PRW ones!

[Richie Hoffman]

check pushrod length

[67Fbird]

^^^^ would still verify rocker pattern on valve tip.

[soupman]

Ok thanks. I searched where someone else did this swap straight up but will check the wear pattern.

[soupman]

Now that I pulled off the valve cover to fix the heater nipple, I am going to install the Crower roller rockers. I have comp 857-16 lifters, and was going to use the Jim Hand method of adjustment the preload. Can this method be used for hydraulic roller lifters?

https://www.pontiacstreetperformance...p/rockers.html

[steve25]

Adjustment wise, yes!

Just keep in mind that in terms of 1.5 rockers for every .001” of preload you place in the lifter you loose.0015” of valve lift.

.030” of lifter preload will knock off .045” of lift students the valves.

[Skip Fix]

After playing with a lot of different rockers-check pushrod length!! EVERY brand has a different roller tip OD and often different relation between push rod cup /trunnion and roller tip that can affect that. Even HS "plain" Pontiac rockers vs their thicker "race" body are totally different!

[soupman]

I will check make sure the roller tip is correct, good point.

Spinning the pushrod seems subjective to feel, might have to wiggle it some to determine zero lash point. I really don’t want to pull the intake.

[adynes]

Originally Posted by steve25

Adjustment wise, yes!

Just keep in mind that in terms of 1.5 rockers for every .001” of preload you place in the lifter you loose.0015” of valve lift.

.030” of lifter preload will knock off .045” of lift students the valves.

What???

[soupman]

Changing out the PRW rockers. Tip pattern seems good to me, but would like other people’s opinions, only have about 500 miles on them.

Also one rocker seems out of alignment, it’s cockeyed, all roller tips point to 6:00 but this one roller tip points to 7:00, how do you correct this?

[PunchT37]

Bent pushrod?

[steve25]

What heads are you running?
Did they start life as pressed in stud heads and where drilled and tapped for screw in studs?

Is the push rod cup in these misaligned rockers in the same location left to right as the others that are ok?

Is the guide plate hole not centered on the rocker stud?
If not then you will need to cut the guide plate in half so it can be held down by the stud in the right / correct centered position.

Is the rocker stud dead straight?

[soupman]

These are 96, was a running set I bought to get my motor together and running. Was converted to screw in studs by PO. Ran great with the PRWs. BTW these are not tightened down yet, just sitting on the trunnions to illustrate that one rocker alignment issue. I will check the items you mentioned.
Does the wear pattern on the valve tips look ok?

[67Fbird]

for just drop ins...yeah, need to verify pushrod clearance thru the head hole...not all 1.65's are the same. Yeah you are in for a little work fixing that alignment. You might be able to balance out the intake and exhaust by tweeking the pushrod guide one way..then snug it...see how bad it affects the other rocker AND pushrod thru the head clearances. I hope that pushrod is not seated or something cause thats kind of a mess looking.

[steve25]

Yes, your wear pattern looks good with those length push rods.

[soupman]

Seems the rocker stud is straight, pushrod not bent. I loosened the guide plate and was able to shift them a little, there was some play. Seemed to move back a little, not sure if will shift or not when running.