Changing to roller rockers
Thread Starter
Instructor
Joined: Mar 2006
Posts: 174
Likes: 1
From: Bettendor Iowa
Changing to roller rockers
1985 stock L98. Previous owner changed out 1.5 rockers to 1.6 stock-like rockers (they are not rollers or even roller tip). I've always ran Harlan Sharp aluminum roller rockers on my latemodel racing engines with no failures. 2 questions....will changing to a 1.6 roller rocker give a little more power? and can I just swap out the rockers, adjust the rockers correctly, and not have to make any other modifications? Thanks.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Given the wimpy specs on the stock cam money would be better spent on a cam change.
Plenty of choices that wiill give better results without the rocker change which you can always do latter.
Plenty of choices that wiill give better results without the rocker change which you can always do latter.
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
You will get a little more power with 1.6 RR. I used 1.5 on the exhaust and 1.6 on the intake. No installation problems. Dyno reports on the Forum have indicted about 8 HP (+) gain depending on engine and other options.
Racer
Joined: Oct 2005
Posts: 405
Likes: 0
From: 1984 crossfire, Alhaurin de la Torre Malaga, Spain
Originally Posted by John A. Marker
You will get a little more power with 1.6 RR. I used 1.5 on the exhaust and 1.6 on the intake. No installation problems. Dyno reports on the Forum have indicted about 8 HP (+) gain depending on engine and other options.
Burning Brakes
Joined: Nov 2004
Posts: 1,057
Likes: 0
From: Warren Ohio
Originally Posted by Jansenwins
1985 stock L98. Previous owner changed out 1.5 rockers to 1.6 stock-like rockers (they are not rollers or even roller tip). I've always ran Harlan Sharp aluminum roller rockers on my latemodel racing engines with no failures. 2 questions....will changing to a 1.6 roller rocker give a little more power? and can I just swap out the rockers, adjust the rockers correctly, and not have to make any other modifications? Thanks.
b. "and can I just swap out the rockers...and not have to make any other modifications?" - If you are *already* at 1.6 (and valvetrain geometry is already correct, etc.) then you won't have to worry about springs, pushrod length adjustment, etc.
