1986 Chevrolet Truck Replaced Entire Gasket Group Top Engine 5 7 Holley

1986 CHEVROLET TRUCK

38,000 MILES

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i have replaced the entire gasket group for the top of the engine..its a 5.7 holley performance engine..all new spark plugs..spark plug wires..new distributor cap with built in ingnition coil and new rotar button..it has a holley 600 cfm carb 4 barrel i have re timed this engine 3 times but still it backfires thru the carb..any words of advice?

Mar 24, 2013 at 10:57 PM

HMAC300

CAR REPAIR CONTRIBUTOR
48,601 POSTS

check for a worn cam or a pushrod that has come off on the exaust side find what cylinder it is first by reomving plug wires one at a time until it stops then pull that side valvecover off. start engine and if 1 rocker arm isn't going up and down like the others then the camshaft is worn probably. or ook for a pushrod off of rocker arm or through it.

Mar 24, 2013 at 11:04 PM

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