smokie wrote: ↑Wed Dec 28, 2022 8:06 pm
Exactly. The pattern I have now is only about .040", but it's so far out on the valve tip it worries me. What if the valve train becomes unstable? Will the rocker fly over the edge of the valve? Just makes me nervous.
I experienced exactly this with:
COMP Pro Magnum 1.6.
.100" longer valve.
Narrow but nearly off the edge.
Crower 1.6 with an .050" backset solved this issue. Narrow and centred.
That was on a RHS iron head.
The same condition existed (more or less) on AFR 195's and the same COMP rocker. However the Crower backset option was too much. But, the conventional Crower with a centred trunnion hole, brought all of the elements together for a narrow centred pattern.
This goes back to your threads original question. Yes, there are differences between brands.
I'm not a professional engine builder as many here are. My scope is very finite and pertains to what I'm involved with. The best I can do is relate my experiences and hope that it helps.
Are those crower rockers steel or stainless steel? What are the crower rockers called? I don't think crower even offers aluminum rockers do they?
Holy shit, 800 bucks for a set of rockers. Good lord that's crazy.
Crower Rockers.jpg
Yep. Pricey.
Try purchasing in Canadian dollars. That's really painful.
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skinny z wrote: ↑Wed Dec 28, 2022 8:21 pm
I experienced exactly this with:
COMP Pro Magnum 1.6.
.100" longer valve.
Narrow but nearly off the edge.
Crower 1.6 with an .050" backset solved this issue. Narrow and centred.
That was on a RHS iron head.
The same condition existed (more or less) on AFR 195's and the same COMP rocker. However the Crower backset option was too much. But, the conventional Crower with a centred trunnion hole, brought all of the elements together for a narrow centred pattern.
This goes back to your threads original question. Yes, there are differences between brands.
I'm not a professional engine builder as many here are. My scope is very finite and pertains to what I'm involved with. The best I can do is relate my experiences and hope that it helps.
Difference in heads though.
That Comp rocker (earlier picture) came off a Brodix head and the contact is narrow and centered, on the Dart and the Vortec with standard valves it's outboard.
Ignorance leads to confidence more often than knowledge does.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
I guess I need to go to the truck stop and start pimping myself lol
The last motor I built was back in 2010, everything has gone up big time and half of what used to be good brands is now selling crap coming out of China. Elgin used to sell some good stuff, now half of it's Chinese from my understanding.
Tom68 wrote: ↑Wed Dec 28, 2022 9:27 pm
Difference in heads though.
That Comp rocker (earlier picture) came off a Brodix head and the contact is narrow and centered, on the Dart and the Vortec with standard valves it's outboard.
Exactly my experience as well. What worked on RHS didn't cross over to AFR.
skinny z wrote: ↑Wed Dec 28, 2022 9:54 pmOr even since 2019!
Yup right after the election I knew that prices were gonna go up and started to plan n buy parts that I need for future stuff. Seen much of it increase since, well a few things got cheaper but meh can't win em all LOL
Still blows my mind how many of the intake manifolds I bought for $200 are now $400, I rem when they were $100!
Yeah, I can't believe a intake is almost $400 bucks. A roller cam is almost $400. Hell I don't have that in my bare head castings. Lol. Valves have went stupid high too.
I'm focusing on a Jones cam.
That's $480 USD.
Or more like $675 in my dollars. Plus shipping.
But I'll pay for quality.
Plus Mike doesn't know how much I'll bug him prior to purchase...
I fully expect to invest 3 grand on the valve train.
Cam, lifters, springs, rebuilding rockers, incidentals.
Not a lot by some of the high zoot standards presented here but a lot just the same.
Crower endurance ss are stainless steel. But crower also has aluminum roller rockers.
Comp did have both chrome moly and stainless steel but 15 years ago they changed the design. Now they have a std version and a XD version the XD has billet insert pushrod cups. Comp are not same or has never been the same as the crow or any other cheap chinese copy. They are made and assembled in the Us.
First two pictures are of ”old” stainless comps.
Last picture from left to right ”old” comp chrome moly ,
”new” comp magnum, ”new” comp XD and last Crower ss endurance. I feel the XD is very nice and close to the Crower ss same with the old stainless comp.
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Chevrolet Chevelle Malibu SS 1964
489 BB 600 hp
Th 400
12 bolt 3.31
Marcus wrote: ↑Sat Dec 31, 2022 7:03 pm
Crower endurance ss are stainless steel. But crower also has aluminum roller rockers.
Comp did have both chrome moly and stainless steel but 15 years ago they changed the design. Now they have a std version and a XD version the XD has billet insert pushrod cups. Comp are not same or has never been the same as the crow or any other cheap chinese copy. They are made and assembled in the Us.
First two pictures are of ”old” stainless comps.
Last picture from left to right ”old” comp chrome moly ,
”new” comp magnum, ”new” comp XD and last Crower ss endurance. I feel the XD is very nice and close to the Crower ss same with the old stainless comp.
I have all of those on the shelf with various mileage (early COMP, newer COMP, Crower).
The Crower SS Endurance are also approaching 30,000 miles and need to be rebuilt. I never would have expected that limited a life span but I guess that's the case.
I measured center of the trunion to the center of the roller tip and it measures 1.43". That sounds like a sb Ford rocker. I gotta give them a call. Surely scorpion doesn't use the same rocker for both.
