[Johnathan]

Hey guys, I don't post too much over here since I can usually find what I need via. the search... That being said I'm stumped on my current issue...

Issue: Backfire/Popping thru exhaust at idle + low rpms

Background: Engine had a broken head stud + exhaust leak so I decided to jump in a do a top end rebuild myself. Replaced rings+rod bearings, rods balanced, heads rebuilt by a reputable shop, reground SC cams to 964. Replaced rusty heat exchangers with SSIs + a 2in banana muffler modified with 2 outs. And all the various other necessities..

Observations: drivers side exhaust out is hotter than the passenger side (~100degF via. infrared thermometer). The individual exhaust tubes seems to be cooler on the passenger side but only by about ~50degF. The popping seems to be coming from the passenger side. Cars drives well at speed, but pops when I come to a stop or am at partial throttle cruising thru the neighborhood.

Corrective Actions: Tightened all exhaust bolts, Adjusted my CIS mixture via adjustment screw.

Tests: Performed CIS pressure tests, checked out OK

Thoughts: Incorrect Cam timing on passenger side cylinders (Please don't let it be this one... I'm sure I set this dead on at 1.26mm). Exhaust leak. Incorrect mixtures... Bad luck???

Thanks for any help you can give guys...