The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Question for the guys running 3.73's with a 6cyl and manual trans

curvedglass · 08-05-2015, 11:20 AM

Update:
things have been better. I have been able to get some power out of my third gear now and my last tank of fuel was over 18mpg.

New question ... re-gapping spark plugs.

When I added the carb and HEI I never changed the plug gap. Actually never thought of it. Friend told me I can't take full advantage of the HEI without re-gapping the plugs.

What should the gap be for HEI?

08-05-2015, 11:20 AM	#44
curvedglass Registered User Join Date: Apr 2014 Location: Pennsylvania Posts: 186	Re: Question for the guys running 3.73's with a 6cyl and manual trans Update: things have been better. I have been able to get some power out of my third gear now and my last tank of fuel was over 18mpg. New question ... re-gapping spark plugs. When I added the carb and HEI I never changed the plug gap. Actually never thought of it. Friend told me I can't take full advantage of the HEI without re-gapping the plugs. What should the gap be for HEI?