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Posted by Duffy
 - August 05, 2010, 19:19:10 PM

I just put LongShots on my Classic FI (basically the same engine) and had the dreaded popping also.  Mine turned out to be the front pipe had not seated correctly.  Loosened and re-adjusted and now all is good (I used the old gaskets also).

I have Straight shots on the Drifter and it doesn't pop at all but does have a "gurgle" on decel.

Posted by chief
 - August 05, 2010, 10:02:56 AM

Yeah, too much air... either you have a gasket leak OR (like me) you need a EFI add-on to compensate. I had to add a Cobra FI2000 to mine to get rid of the decel backfiring (after I triple checked that there were no air leaks around the exhaust gaskets). There are several boxes you can choose from ... the Cobra was the easiest and did the trick with no tweaking. Check the accessories area of the web site.

Posted by antocas
 - August 05, 2010, 04:06:52 AM

 any one have any clues as to why my new v+h longshots backfire under deceleration

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