67GTX440
Well-Known Member
Since I have about exhausted all cooling system causes of my car running at just over 200 degrees, I am looking at the timing, advance and A/F tomorrow.
Car is a 440 with a replacement Edelbrock 4 bbl carb and the engine was rebuilt pretty much stock with minor modifications to better run off unleaded gas. It has had a Pertronix electric ignition conversion added to the distributor. I run it on standard 93 octane unleaded from Shell. No knocking at all. I do not know the specifics of the rebuild. Car starts first bump of the starter after sitting for weeks and drops into a decent idle immediately. Exhaust looks clean. Car seems to run fine and has done so without touching the carb or distributor the past four years.
My question is regarding the specs from the shop manual. Should all of these settings for timing, advance, plug type and plug gap still be where I want it set? Would any of these be different as a result of premium unleaded now being the fuel source as opposed to premium leaded in 1967?
12.5 degrees BTC at set at idle
0 degrees advance at 325 to 425 RPM
0 to 4 degrees advance at 425 RPM
4.5 to 6.5 degrees advance at 640 RPM
8.5 to 10.5 degrees advance at 2200 RPM
Is J-11Y Champion or P3-3P Mopar plugs gapped at .035
Thanks!
Don
Jacksonville, FL
Car is a 440 with a replacement Edelbrock 4 bbl carb and the engine was rebuilt pretty much stock with minor modifications to better run off unleaded gas. It has had a Pertronix electric ignition conversion added to the distributor. I run it on standard 93 octane unleaded from Shell. No knocking at all. I do not know the specifics of the rebuild. Car starts first bump of the starter after sitting for weeks and drops into a decent idle immediately. Exhaust looks clean. Car seems to run fine and has done so without touching the carb or distributor the past four years.
My question is regarding the specs from the shop manual. Should all of these settings for timing, advance, plug type and plug gap still be where I want it set? Would any of these be different as a result of premium unleaded now being the fuel source as opposed to premium leaded in 1967?
12.5 degrees BTC at set at idle
0 degrees advance at 325 to 425 RPM
0 to 4 degrees advance at 425 RPM
4.5 to 6.5 degrees advance at 640 RPM
8.5 to 10.5 degrees advance at 2200 RPM
Is J-11Y Champion or P3-3P Mopar plugs gapped at .035
Thanks!
Don
Jacksonville, FL