Rocker arm comparison

[63409impala]

Well, with what im going through with my 409, I figured why not try different rocker arms to see which one is best for my setup. Already tried prw stainless to find out they don't like solid roller spring pressures. I will be comparing harland sharps, scorpions race rockers, comp gold rockers, crower stainless rockers, and walden pedestal rockers.

 

[Skip FIx]

Crower SS are by far the best roller rocker. Larger trunnion bearing than anyone else. Comps' SS are pretty good too,what I have on mine. Heard mixed reviews on PRWs from the Pontiac guys also.

 

[63409impala]

Comp ss rockers don't clear my valvesprings. The trunions on the new ones are too wide.

 

[Fathead Racing]

Hard to beat Harland Sharp.

 

[MRHP]

I have had Scorpions on my stroker for 20 years without issue. 8000+ rpm, hundreds of passes, and thousands of street miles. Enough said.

 

[63409impala]

Hard to beat Harland Sharp.

I have those too but just can not seem to get it close to being right. If I get close my exhaust push rod ends up being shorter than my intake push rod and I am not sure if that's right

 

[63409impala]

Seems like alot of guys are using the scorpions on 409s from what I gather

 

[Fathead Racing]

I have those too but just can not seem to get it close to being right. If I get close my exhaust push rod ends up being shorter than my intake push rod and I am not sure if that's right

You don’t know that the intake and exhaust pushrods are different lengths in the stock W engine?

 

[63409impala]

You don’t know that the intake and exhaust pushrods are different lengths in the stock W engine?

Yes I do know they are different lengths. But usually the exhaust is longer than the intake. Or so I thought. To get the right sweep on the intake, it uses a 9.100 length pr. To get the exhaust looking decent, it's either the same length, or a little shorter.

 

[Fathead Racing]

Yes I do know they are different lengths. But usually the exhaust is longer than the intake. Or so I thought. To get the right sweep on the intake, it uses a 9.100 length pr. To get the exhaust looking decent, it's either the same length, or a little shorter.

I have never encountered that situation in all the valve trains i have set up.

 

[Barry Taylor]

I’m pretty sure the ex. length on my motor is 9.100 and the intakes are 8.900 This is with stock length valves and a 735 lift cam. I’ll try to pull a cover Sunday and see if i can verify this. “There marked”.

 

[63409impala]

Barry, my valves are .100 longer than stockers. And I have a .655 solid roller with 1.7 ratio roller rockers. I'm just trying to do the best I can .

 

[La Hot Rods]

Looking like you will need shaft rocker arm pedestal's with some offset, or look into a shorter valve with a different spring retainer.

 

[Tim]

Comp ss rockers don't clear my valvesprings. The trunions on the new ones are too wide.

Why is there what looks like a bolt holding the rocker on instead of a nut or poly lock?

 

[Tim]

Had plenty or room on mine with big trunnions.

 

[Fathead Racing]

Barry, my valves are .100 longer than stockers. And I have a .655 solid roller with 1.7 ratio roller rockers. I'm just trying to do the best I can .

If I get to the shop today I’ll look up the paperwork on my old 690 heads. If I remember correctly the intakes are Chevy BB and the exhaust are Pontiac Ram Air. The valves themselves are different heights.

 

[63409impala]

Why is there what looks like a bolt holding the rocker on instead of a nut or poly lock?

Thats actually the very top of the rocker stud. Lol

 

[63409impala]

If I get to the shop today I’ll look up the paperwork on my old 690 heads. If I remember correctly the intakes are Chevy BB and the exhaust are Pontiac Ram Air. The valves themselves are different heights.

Thank you so much if you can. Both of mine are bbc valves

 

[63409impala]

And again, thank you to everyone who has commented on the topics I post. Its appreciated more than yall know

 

[Don Jacks]

I distinctly remember Ronnie telling me that when using big block length valves correct geometry becomes a real PITA.Sounds like what you're running into here.