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68gmsee · 10-25-2012, 05:37 PM

First thing I would do is to change the timing back to specs. 12º BTDC is too advanced for that six with points. You can play with it and advance it slightly to 2º or maybe 4º but even on my 250 with HEI I keep it at around 8º BTDC.

10-25-2012, 05:37 PM	#12
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Cracked Exhaust Manifold Questions First thing I would do is to change the timing back to specs. 12º BTDC is too advanced for that six with points. You can play with it and advance it slightly to 2º or maybe 4º but even on my 250 with HEI I keep it at around 8º BTDC. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...