Internal engine problems

1995 CHEVROLET SILVERADO
80,000 MILES • 4.3L • 6 CYL
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MICHAEL ROYER
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Have a Bayliner with a 4.3 Vortec Mercruiser that has back pressure and blew out valve cover gaskets. What caused this?
Jul 6, 2016 at 8:21 PM
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HMAC300
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check for a clogged pcv system normally that is what does it from coming down from higher rpm. also check for a clogged breather system.
Jul 7, 2016 at 6:07 AM