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Old 09-15-2021, 12:01 PM   #11
BASE
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Join Date: Oct 2016
Location: St Louis, MO
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Re: Big block problems (Chevelle)

Quote:
Originally Posted by Keith Seymore View Post
Maybe I missed it, but how much lift on the cam?

Is there clearance from the inside of the rocker to the locking nut in that area? Meaning - is the cast portion of the rocker hitting the nut in that area and causing a stress riser?

Is it time for a stud girdle?

K
That would make sense. The intake and exhaust pushrod lengths are different in those things so it could explain why only the exhaust is breaking.

Just doesn't seem like a failure would happen where they are breaking even if they were heated up too much, should be breaking down where they are loaded.
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