1:7 Roller Rockers?
Thread Starter
Racer
Joined: Sep 2004
Posts: 363
Likes: 0
From: Granville Illinois
1:7 Roller Rockers?
Ok I am not going to lie...I don't want to tear into my LT4 with no leaks to do the cam if I can keep away from doing so. Does anyone make a 1:7 rocker arm and what kind of improvements would one expect to see.
Burning Brakes
Joined: Nov 2004
Posts: 1,057
Likes: 0
From: Warren Ohio
CompCams and Scorpion both make 1.7 ratio narrow-body rockers last I checked.
The CompCams offering is out of their Hi-Tech line and pretty pricey. $425 comes to mind.
Scorpion was around $200-210 a couple of years ago.
I think that they're both NSA, so you'll need hardened pushrods and guideplates. You'll also need new studs, as the LT4 stock studs are 10mm and the aftermarket pieces will be 3/8" or 7/16". (might as well go with 7/16" if you upgrade.)
You already have 1.6 roller rockers, so the benefits won't be as great as the LT1 guys going from a 1.5 ratio stamped steel rocker to a 1.6 roller.
I'd think you'd net somewhere between 5-10hp, but hopefully one of the LT4 guys will have more qualified feedback on this.
The CompCams offering is out of their Hi-Tech line and pretty pricey. $425 comes to mind.
Scorpion was around $200-210 a couple of years ago.
I think that they're both NSA, so you'll need hardened pushrods and guideplates. You'll also need new studs, as the LT4 stock studs are 10mm and the aftermarket pieces will be 3/8" or 7/16". (might as well go with 7/16" if you upgrade.)
You already have 1.6 roller rockers, so the benefits won't be as great as the LT1 guys going from a 1.5 ratio stamped steel rocker to a 1.6 roller.
I'd think you'd net somewhere between 5-10hp, but hopefully one of the LT4 guys will have more qualified feedback on this.
Last edited by 95PoloVert; Feb 20, 2008 at 03:25 PM.
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Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
His heads are tapped 7/16 for the rocker studs.
The factory GM STUDS are 7/16 on the bottom and 10mm on the top.
NEILZVETTE
All you will need is new 1.7 Rockerarms, regular 7/16 Studs, Guide Plates and Hardened Pushrods. It is a bolt on proceedure.
Will
The factory GM STUDS are 7/16 on the bottom and 10mm on the top.
NEILZVETTE
All you will need is new 1.7 Rockerarms, regular 7/16 Studs, Guide Plates and Hardened Pushrods. It is a bolt on proceedure.
Will