I am working on a 1969 camaro for a customer of mine. The engine is a brand new rebuilt (by somebody else) 350 V8 with HEI ignition, MSD supercoil, large cam, Trick Flow aluminum heads, demon carborator, roller rocker and roller lifters. We have checked the timing, rebuilt the carborator, changed the spark plugs because they were fouled out, adjusted the valves, and tomorrow we will be changing the oil because it is very saturated with gasoline. The car idles great but at high RPMs loses power and consistantly backfires out the exhaust. The backfiring is not one big bang, but a timed series of low pops as if it is even with the ignition. I believe this has something to do with the valves or the cam not being broken in correctly. Everything on this engine is brand new and we did a compression test and the numbers came out 150 or higher. What do we do next? Thanks.
(asking for husband)
2007-06-04
15:41:45
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9 answers
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asked by
wendysorangeblossoms
5