Rocker Arm Round-up
Thread Starter
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
Likes: 13
From: Texas
Rocker Arm Round-up Just trying to sort out what all is out there from a rocker arm standpoint, if it will clear the stock valve covers, ratios, and perhaps (but not required) list price.
Mfg/ratio/clear/price
Stock GM/1.7/y/???
SLP (stock look alike)/1.8/y/???
SLP aluminum/1.8/y (with minor clearance work)/$499
Comp magnum rocker / 1.75,1.85/y/$483.24
Crane Gold/1.8/?/$699
Crane Shaft/1.7-2.0/n/???
Jesel SS / 1.7,1.75,1.8/y/$699
Jesel J2K/ 1.7-2.0/n/$1437
Harlan Sharp/TBD
Yella Terra/TBD
DRE/TBD
Scorpion/TBD
Please feel free to add to the list. I'll pretty it up as I go along...
Mfg/ratio/clear/price
Stock GM/1.7/y/???
SLP (stock look alike)/1.8/y/???
SLP aluminum/1.8/y (with minor clearance work)/$499
Comp magnum rocker / 1.75,1.85/y/$483.24
Crane Gold/1.8/?/$699
Crane Shaft/1.7-2.0/n/???
Jesel SS / 1.7,1.75,1.8/y/$699
Jesel J2K/ 1.7-2.0/n/$1437
Harlan Sharp/TBD
Yella Terra/TBD
DRE/TBD
Scorpion/TBD
Please feel free to add to the list. I'll pretty it up as I go along...
Put DRE in the bag and Scorpion should have some by PRI. It's funny you mention rockers arm J-rod. I thought about you yesterday as I was on the phone with a fellow I consider one of my mentors and one of the smartest men in this industry, French Grimes. Rockers came up yesterday. French simplifies everything so one can understand but when he said the following I had to smile on the phone because I new the answer: "What makes a good rocker a good rocker?", he asked. I said, " a tri-angle". I could hear him grin and we were back on my topic of conversation of trying to diagnose timing chain failures which we feel is do to a Power Harmonic.
. .well back to work.
. .well back to work.
Originally Posted by Cstraub
Put DRE in the bag and Scorpion should have some by PRI. It's funny you mention rockers arm J-rod. I thought about you yesterday as I was on the phone with a fellow I consider one of my mentors and one of the smartest men in this industry, French Grimes. Rockers came up yesterday. French simplifies everything so one can understand but when he said the following I had to smile on the phone because I new the answer: "What makes a good rocker a good rocker?", he asked. I said, " a tri-angle". I could hear him grin and we were back on my topic of conversation of trying to diagnose timing chain failures which we feel is do to a Power Harmonic.
. .well back to work.
. .well back to work.
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and they do NOT clear the stock valve covers without some grinding. 
TECH Resident
Joined: Dec 2004
Posts: 881
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T&D shafts...a little less $$$ than the Jesels, also race worthy...maybe a little below the Mohawks in finish. T&D and Jesel are major providers of racing shaft systems (I believe all NASCAR teams use either Jesel or T&D).
Crane's clear without issue on centerbolt, not on early perimeter. Just installed in my 02 Vette without a problem.
I would suggest, if you can find the information, adding not only weight (which may be less relevant) but also rotary mass moment of inertia. Just not sure if the manufacturers will provide the information or how to obtain for stock rockers. This is perhaps a more important number than just dead weight.
I would suggest, if you can find the information, adding not only weight (which may be less relevant) but also rotary mass moment of inertia. Just not sure if the manufacturers will provide the information or how to obtain for stock rockers. This is perhaps a more important number than just dead weight.
Teching In
Joined: Apr 2005
Posts: 4
Likes: 0
The stock rockers weigh in at 137 grams. The Crane/VHP rockers weigh 142 grams. The bulk of the weight is located over the stud, which lessens the moment of inertia. on the Crane/VHP rocker. The stock rocker begins to deflect at 2200 lbs pressure and breaks at 2300 lbs. The Crane/VHP rocker is still steady at 3400 lbs. I think the slight increase in weight is well worth the extra strength factor, especially when the weight is centered over the stud. There is no doubt in our minds that the power increases have been well documented on this and other sites. We have never recorded an instance of any sort of rocker failure in the seven years we have been using our Crane/ VHP rockers. Roger
Thread Starter
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
Likes: 13
From: Texas
I'll start putting htis into an excel spreadsheet with all y'all suggestions. Thanks. If anyone can help dig up more data on mass, adjustability, etc... Feel free to post it up. I'll include whatever we can find.
Originally Posted by Cstraub
Put DRE in the bag and Scorpion should have some by PRI. It's funny you mention rockers arm J-rod. I thought about you yesterday as I was on the phone with a fellow I consider one of my mentors and one of the smartest men in this industry, French Grimes. Rockers came up yesterday. French simplifies everything so one can understand but when he said the following I had to smile on the phone because I new the answer: "What makes a good rocker a good rocker?", he asked. I said, " a tri-angle". I could hear him grin and we were back on my topic of conversation of trying to diagnose timing chain failures which we feel is do to a Power Harmonic.
. .well back to work.
. .well back to work.
Is French related to Norm?
Bret
Originally Posted by SStrokerAce
This is why I like you!
Is French related to Norm?
Bret
Is French related to Norm?
Bret
Chris
TECH Resident
Joined: Sep 2003
Posts: 848
Likes: 1
From: Working in the shop 24/7
Originally Posted by Cstraub
. . .oohh it even got better. We got into rod/stroke ratio and going back to something DenzSS had touched on last year about angularity and cylinder pressure and runner volume based in relation to the CID and intended rpms of an engine. It was pretty interesting listening.
Chris
Chris
Ed
