Yup, dude, thats probably the cause of your backfire. There's extra oxygen getting in there and ther unburnt fuel is igniting.
The flange separates all the time for me, especially after I went to aftermarket headers. The mac's had some cheap studs that came out the first time I tightened the nut and they have been backing off at regular intervals ever since. You'll need about 2 extensions at least to reach the nut down there and it's loads of knuckle busting fun! =P
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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