View Single Post
Old 10-13-2020, 07:02 PM   #4
nikwho
Registered User
 
nikwho's Avatar
 
Join Date: Apr 2010
Location: Flagstaff, AZ
Posts: 974
Re: Carb tuning question for altitude and temperature change.

No AFR readings, though my new exhaust system has bugs welded in already. Im going that route soon. Might need to for that trip! Like I said, limited test and tuning time on the new engine. Ive pulled plugs and they looked good, but it was on mains, secondaries and idle circuit after pulling them. I haven't gotten out and made wide open throttle or half throttle runs, then shut immediately down and checked them.. not yet, anyway.. Went from NGK UR5 plugs to UR4 plugs. I figured being a moderately stock engine, there was no need to move to a cooler plug from stock. And I BELIEVE that the UR4 NGK plugs are considered a "standard" plug. I've got both, though.

I'll pull a little timing out of it, to get it at 34°-36° total timing. That'd give me around 12° or so initial timing.
__________________
'59 Apache - 383" SBC/TH-350
'68 GMC - BBC/TH400
nikwho is offline   Reply With Quote