Rocker Arms
1 - 2 of 2 Posts
The consensus has always been that aluminum rockers will fatigue and fail. Tens of thousands of engines with them. 
Ford used Crane 1.7 full rollers on the 93 Cobra Mustang expecting 150,000+ longevity. But they are on a cam of .471 lift and a spring of 250# over the nose.
Biggest concern is how much lift, how heavy of springs, how much rpm. More load and more rpm = fatigue.
.650 lift, 450# springs, and 7000 rpm is probably asking for trouble. :nono:
Steel rockers are virtually fatigue proof.
Ford used Crane 1.7 full rollers on the 93 Cobra Mustang expecting 150,000+ longevity. But they are on a cam of .471 lift and a spring of 250# over the nose.
Biggest concern is how much lift, how heavy of springs, how much rpm. More load and more rpm = fatigue.
.650 lift, 450# springs, and 7000 rpm is probably asking for trouble. :nono:
Steel rockers are virtually fatigue proof.
1 - 2 of 2 Posts
Join the discussion
