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Old October 6th, 2012, 09:16 PM   #1
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Default propane problems on sbc

I have recently converted my built 327 to propane using an impco 425 and model e. I have recurved the distributor to be full in early at 34 degrees roughly. I am having a problem with it caughing out the intake up around 3k rpm and above and heavy load situations but lower rpms just cruising down trails and crawling the rocks it does well just when you thrash it and really get into it it has issues. also sometimes at lower rpms when you let off the throttle it almost wants to stahl for some reason. It seams to have a bit of a miss at times and isnt as responsive on the throttle as I believe it should be and Its also a bitch to start. I have no experience with the propane and am learning as i go but so far everything i have read and confirmed to be the correct way of setting this up through tons of research and reading tons of forum threads has helped but its still not right I dont know what dirrection to go. I have been wondering if the motor is built too much for propane but am unsure if that will even hurt it. I have read that propane actually likes higher compression and single plane intakes but again this is just what i have read as im inexperienced with propane. I am running Victor jr intake with around a .560 lift cam alluminum vette heads and mallory ignition aroung 12-1 compression. Hopefully someone can help me out and shed some light onto my situation. I have given all the info i can think of. Any help or ideas at all are appreciated.
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