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Impala65SS 07-14-2009 09:34 PM

1965 283 Backfire
Just got done rebuilding the original 283 for my 1965 impala ss resto project, fired up the motor for the first time, it ran good for not being timed yet, there was some top end noise so i went and adjusted the valves the next day like the repair manual says. Losen rocker nut until push rod spins then tighten a full turn. i went to fire it up and it would not start. If i step on the gas pedal at all i get a huge backfire and flame out the carb. Are these valves too tight causing them to stay open?? Or is it a carburetor adjustment?


Gregg-O 07-14-2009 09:58 PM

Back them all off about a 1/2 a turn, adjust them with the car running, backoff until it chatters, tighten until it stops chattering, give it maybe 1/2 turn more. If you have a dwell meter , adjust the points to 30 degrees. Set the timing. Adjust the at a time, turn the mixture screws in until the thing just about dies, then back it out 2 1/4 to 2 1/2 should be able to tell when your in the 'sweet spot'.

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