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Old 09-13-2017, 07:58 AM   #12
homemade87
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Join Date: Apr 2010
Location: Guntersville Alabama
Posts: 1,073
Re: Need advice on fixing broken rocker stud on Big Block..

Quote:
Originally Posted by bs46488 View Post
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
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 .
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