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06-27-2010, 09:00 PM
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Registered User
Join Date: Feb 2010
Location: San Marcos, Ca
Posts: 109
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new 454 in my 71, backfiring issues
I put a new motor in my old truck, mild 454. with a cam, new edelbrock 750 carb, new performer intake, thorley tri y's etc. HEI ignition
I am taking it tomorrow for the exhaust, currently running open headers. Under load, the motor backfires. At cruzing speed, like 35-40 it is smooth. Idle in neutral smooth, revving at idle smooth. Once I get moving smooth. The timing is set to 4 degrees btdc and I think I am good on the vacuum side of things. Any advice would be welcome.
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Current stable: 1970 K5 Blazer 4x4 1972 K5 Blazer 4x4 SOLD: 1971 GMC Sierra Grande 2500 2wd 1972 Chevrolet K5 Blazer 1966 Chevrolet C20 1972 Chevy Suburban 4x4 1500 1956 Chevy 150 2 door post 1956 Chevy 2 door post bel air 1968 Chevrolet C20 1958 Ford Thunderbird 1968 4x4 Suburban 1/2 ton |
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