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Hi im new to forums and sled mechanics so i rebuilt my 1973 340 olympique a short time ago after finding out one cylinder had zero compression so i got it done and it ran great for a little while lots of power and rpm's but now it idles fine but after that it just backfires and boggs alot and no power, theres no electric leaks visible in the dark so now i just dont know what to do thanks for any advice :face-icon-small-dis. I just rechecked the compression since after the rebuild and its now way down at 94 psi a side
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