RR question
Thread Starter
Registered User
Joined: Aug 2012
Posts: 134
From: South Jersey
RR question
http://www.summitracing.com/parts/CRN-10758-16/
I was wondering if anyone has used these. If so, what kind of review would you give them. Are they comparable to the Ultra Pro Mags?
I have a chance to get a complete set for $200 with very low miles on them. Would it be worth it or should I save for something better. I take the car to the track maybe 3 times a yr, other than that just a lot of spirited DD driving.
I was wondering if anyone has used these. If so, what kind of review would you give them. Are they comparable to the Ultra Pro Mags?
I have a chance to get a complete set for $200 with very low miles on them. Would it be worth it or should I save for something better. I take the car to the track maybe 3 times a yr, other than that just a lot of spirited DD driving.
Administrator
Joined: Nov 1998
Posts: 71,120
From: Hell was full so they sent me to NJ
Re: RR question
GM used "modified" Crane Golds in the LT4 engines.
ROLLER ROCKER ARMS
The LT1's stamped steel rocker arms exhibited ball galling at 6400 rpm, so modified Crane roller rockers were substituted in the LT4 with lock nut and set screws to replace the conventional ball and friction nuts. Shims were added to maintain the valve stem accurately and the stud slot widened. The roller axle reduces friction measurably, the 2 lbs-ft reduction increasing economy and responsiveness. The rocker arms also have a roller tip. The LT4 has 1.6:1 and LT1 has 1.5:1 Rocker Ratio.
http://www.grandsportregistry.com/lt1vslt4.htm
The LT1's stamped steel rocker arms exhibited ball galling at 6400 rpm, so modified Crane roller rockers were substituted in the LT4 with lock nut and set screws to replace the conventional ball and friction nuts. Shims were added to maintain the valve stem accurately and the stud slot widened. The roller axle reduces friction measurably, the 2 lbs-ft reduction increasing economy and responsiveness. The rocker arms also have a roller tip. The LT4 has 1.6:1 and LT1 has 1.5:1 Rocker Ratio.
http://www.grandsportregistry.com/lt1vslt4.htm
Registered User
Joined: Jan 2005
Posts: 212
From: San Antonio, Tx
Re: RR question
http://www.summitracing.com/parts/CRN-10758-16/
I was wondering if anyone has used these. If so, what kind of review would you give them. Are they comparable to the Ultra Pro Mags.......
I was wondering if anyone has used these. If so, what kind of review would you give them. Are they comparable to the Ultra Pro Mags.......
Are they comparable to Ultra Pro-magnums? Hell.....I'd doubt they are comparable to the old Pro-mags.
Just my opinion.......
KW
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