Need engine advice N A 598 cubic inch rebuild
#21
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Check the intake manifold and the other bank of cylinders for the missing valve head. Them damn things have a habilt of traveling around in areas you wouldn't believe.
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#28
http://www.ferrea.com/Big-Block-Engine-Valves/p34231
FWIW, REV lists a CL 1201 as a Duramax inconel exhaust valve. Not sure if they interchange.
http://premiumparts.ee/work/rev-valves?lang=en
#30
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Man that's an easy fix. Should have seen mine after I detonated it and bent the intake valve over... There was no combustion chamber valve seats nothing. Valve seats ended up in the other bank of the motor hanging valves open. Little welding couple seats valves and good as new. That's the nice thing about aluminum.