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Old 12-22-2019, 12:12 PM   #3
1976gmc20
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Join Date: May 2015
Location: Montana
Posts: 1,603
Re: Backfire through tbi

Head gasket blown between two cylinders ????
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Current/past Chevy/GMC trucks:
1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10
1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20
1977 Chevy C-10 Suburban; 1980 Chevy K-10
1989 Chevy K1500; 1991 GMC V1500 Suburban
2016 Chevy K2500 HD
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