Quote:
Originally Posted by bs46488
A little more info....
I don't see any marks or contact on the rollers. Here is a pic of the damaged one, you can see some silver on the bottom that looks like the threads.
The rocker studs are 7/16 and just shy of 2"
The previous owner bought these rockers from a marine shop for $120, but no part numbers.
The cam is a Crower 01243, intake 284 with a .541 lift. Exhaust is 290 at .517 lift. The cam card says based on 1.7 rockers, but I can't identify mine.
I can not tell any info on the springs in the head
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The one things I see is there is thread marks on the rocker from the stud . Could be the rocker was pivoting back on the stud and flexing the stud to the point of fatigue and breaking it . This may be the reason why it broke where it did . Could be the reason you see the mark on the stud as well . Take a closer look at it and see if this is a possibility .
If this is the case , could be from the wrong length push rods . Be a good ideal to check the wipe pattern on the valve .