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Discussion Starter · #1 ·
How about opinions on the longevity and durability of aluminum rocker arms on a street engine, average performance build?
How about overall opinions on chrome molly rockers?
Thanks everyone! :)
 

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The consensus has always been that aluminum rockers will fatigue and fail. Tens of thousands of engines with them. :rolleyes:

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.
 
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