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I have replaced the entire gasket group for the.

Tiny
ANONYMOUS
  • MEMBER
  • 1986 CHEVROLET TRUCK
  • 38,000 MILES
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?
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Sunday, March 24th, 2013 AT 10:57 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 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.
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Sunday, March 24th, 2013 AT 11:04 PM

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