Thanks everyone, there was some show on tv where a manufacture was showing all wrong ways to mount a sensor and i swore he said you want it right after all the 4 header pipes converge and maybe 2" after that. Probably doesn't matter so much. I'll try 6" after the collector on the exhaust piping driver's side then. If the shop is doing a good job and good on time i'll have him install a bung with a plug on the other side. i remember to keep over 10 degrees tilted up.
thanks for your help
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69 Gto, 390 posi gears,th400 w/jim hand converter/406 pontiac/#64 HEADS/ 10:1 compression/ 190 PSI with/ TRW 160 thou domes / hooker headers 1 7/8, PRW 1.5 rockers, 405 Crower Springs, Holley 750 vac with proform upgrade, Performer RPM on points / 284 H Single Pattern Crane
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