ok I ordering this heads for my 91 gta trans am http://store.summitracing.com/partde...531+4294792917+ . I was wondering if I should use self aliging rr or non-self aliging? I am at a loss right now on which I should use so any info would be greatly appreicated.

 

"Guideplates Included: Yes"

That means non-self-aligning rockers should be used.

 

Nice Job 57kid. Without a doubt non-self aligning

 

Ok thanks. I just wanted to make sure that I wasn't going to get the wrong part for it.

 

Thanks five7, that was a tidbit that I was unaware of - and it helps to answer the question that I had in the rocker arm thread that I started...

One other thing to be aware of is that if you're using guideplates, you'll want to make sure that you use hardened pushrods (not to be "Captain Obvious", but some people don't know).

 

You need one method of locating the rocker. If you have more than one, you'll create a binding situation.

The common methods are: pushrod pass-through slot in the head (the "original" SBC method); guideplates (used on aluminum heads, typically); and self-aligning rockers. The pushrod pass-through in the head is opened to a round hole for heads with either the guideplates or self-aligning rockers.

 

Hey I just read that other post and I never even realized that 1.5rr are to wide or big for the centerbolt valve covers. And I was wondering if they are then what choices would I have for my heads?

 

You'll need narrow-body rocker arms for centerbolt valve covers - and you can get 'em in 1.5 or 1.6 ratios...

(The issue that I have is that since I'm using 7/16" studs, I can't use narrow-body rocker arms, thus I can't use centerbolt valve covers like I'd prefer...)

 

Good question.
I'm rapidly approaching the same dilemma.
I can't positively confirm this, but supposedly
GMPP offers a full roller rocker 1.6, 3/8 stud
that is compatible with center-bolt valve covers.
They occasionally appear on e-bay.
Can anyone confirm the existence of the items?

 

Well if I can't get them what should I do? I thought I could get 1.5rr for my centerbolt valve covers. But since I can't can anyone tell me what I should do?

 

Comp Pro Magnums. Probably the best roller rocker out there.

 

alright cool I'll go check them out thanks for the help.

 

You're using the 72cc chamber and not the 64? I have the original TFS 23d
heads with 64cc. On stock Corvette pistons, my CR is about 10.3:1. But
they are great heads. Great bang for the buck.

 

hmm... i just bought aluminum heads with guide plates. i have a set of summit narrow body, self aligning, 1.6, aluminum roller rockers. that i planned on running. does this mean i can just ditch the guide plates? and just run the self aligners? i surely don't want to spend anymore money right now.

 

Yeah I'm using the 72cc because I've changed the motor to a 383 stroker and put flattop forged pistions and rods in it with the 72cc heads I'll prob. be around a 9.7 to 1 compression ratio which is good for pump gas and nitrous later if I want to. Matched with a t-56 I should be getting the best of both worlds good gas mileage and 1/4 mile and topend speed so I can run with all the newer cars out there.

 

Well I had the same question about guide plates . I had a motor built and I presumed would come with guide plates with my vortec heads. They have switched to using the self aligning Scorpion brand roller rockers. They have had no problems with their builds at all. The Scorpion brand have been getting alot of great reviews from what I have read about them.