[pontiacs-r-us]

I haven’t seen any comments on PRW’s aluminum body rockers… do they show the same issues in pin/roller area? Are they questionable also? I just purchased an engine that has the aluminum PRW’s on it. Was built by a reputable race engine builder( of all brands)… this is a milder hyd roller cam,but gives me concern after reading about these for so long…. TY …

[Formulajones]

The only aluminum body rockers I trust are Harland Sharp. Otherwise I prefer a steel rocker from Comp or Crower.

It's really up to you but I'd for sure keep an eye on them.

[nas t eh]

As Cliff has indicated watching them or checking on them in hydraulic cam installations, you don’t get any noise indicating an issue, just metal filings/paste on the oil drain plug. The other check is to remove a few and check how much play there is in the pin and roller tip.

[Steve C.]

1.6:1 Rocker-Arm Comparo

What’s in a Number? More Than You Think

"...deflection present in the body of the rocker arm and the pushrod, as both flex under the load of the valvespring, the stresses of harmonics transmitted throughout the valvetrain, and elevated engine temperatures."

https://www.motortrend.com/how-to/hr...r-arm-comparo/


I've seen flow bench testing on a set of SD Performance KRE D-port 300-305cfm CNC ported heads. Tested to 0.600" lift on the intake with the numbers increasing.
Most all the ported aftermarket alum cylinder heads flow well above 0.600" valve lift.


.

[Dragncar]

Originally Posted by Formulajones

The only aluminum body rockers I trust are Harland Sharp. Otherwise I prefer a steel rocker from Comp or Crower.

It's really up to you but I'd for sure keep an eye on them.

Ever hear of problems with Crower aluminum rockers ? I have a set of 1.7s on the self.
Thinking about picking up a set of those Comp chrome molly 1.65s you run to keep on the self.
320$ is a good deal, cheaper than Harland Sharp.
The only set of real 1.65s I have a Erson with I like a lot, they are forged, not extruded. But the are 3/8" stud, almost useless.
For most there is not much a a reason to buy the Crower Enduro 1.65s.
Doubt anyone would ever hurt the Comps.

[Formulajones]

I've never tried the Crower aluminum rockers but Crower makes really nice stuff and their steel enduros are my favorite. I likely wouldn't be afraid to try any of that stuff made by Crower. The Comp steel rockers I've never seen an issue on the street engines I've used them on. Been a while since I've used them till recently though when I couldn't get the Enduros.

The engine I'm doing now I bought a set of Ultra Pro Magnums because I was told Enduros wouldn't be available for months (this was 4-5 months ago) The Ultra Pros have the oversized trunions, extra retainer clearance, and made of 8650 chrome molly. I don't think I can hurt them with a hydraulic roller on this engine. In fact I could get away with less but I tend to like to overbuild a bit for added insurance.