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Old 05-17-2012, 07:34 AM
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Blown 383 exhaust backfire ?

I 'm new to this board and would like to say hello too everyone . I have a 73' vega wagon with a 383 blower motor that is backfiring thru the exhaust periodicly . It seems be doin it after it gets warmed up real good . or after 15-20 miles it will do it once or twice ? temp is running 160 to 190 @ these times when it does it . I have the AFR 195 competition heads with the 2 750 double pumper holley's 671 weiand blower # 1036 . The carbs are jetted fairly fat for our sea level if this helps . Any help or advise would be greatly apprieciated . I have ran dirt modifieds for years , and several years of drag boats but I've never had any dealins with a blower motor ! Thanks Kenny

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Old 05-17-2012, 11:46 AM
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You're not hitting the rev limiter chip are you? That happened to me before I figured it out when I first built mine. Things were happening so fast between first and second shifts coming up so quickly, I didn't realize it, unburned fuel in the headers when the limiter started interruption.
When I die I want to go peacefully - in my sleep, not yelling and screaming like passengers in my car...

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Old 05-17-2012, 11:47 AM
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Power valve ?

I will look at the when I get home tonight at the carbs for power valve ! Thanks for the info . Does jegs or summit sell a afr gauge ? I'm just cruzing 2 rpms and 50 mph just holding it steady ! And she will pop out the exhaust . Not getting on it at all , she runs perfect when it's to the floor !

Last edited by badvega; 05-17-2012 at 11:52 AM.
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Old 05-17-2012, 01:20 PM
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are you 100% on the firing order? I had a buddies foxbody do the same thing.. it was na but very randomly you could hear a backfire out the one exhaust and it ran fine besides that.. found out two cylinders were swapped and i believe the two ended up being 90* apart on the firing order so it wasn't very noticable
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Old 05-17-2012, 01:34 PM
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Firing Order ?

I'll check that too ,but almost positive it's right ! But you never know , I'll look ! Thanks . . . . .
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