Spark Plug Question(s) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DT1 · 07-13-2016, 12:00 PM

With the exception of a mild RV cam and a HEI distributor, my SB Gen1 350 is completely stock.
I decided that after 50,000 miles it was about time to replace the plugs. The thing I immediately noticed was that they are burning very lean. The plugs are AC Delco R44TS.
I was wondering if I should go with a shorter tip R44T or maybe a colder R43TS.
Other than the lean condition, the engine runs great and doesn't ping under any condition.

07-13-2016, 12:00 PM	#1
DT1 Registered User Join Date: Oct 2009 Location: Gardnerville Nv No Mo Cali!! Posts: 869	Spark Plug Question(s) With the exception of a mild RV cam and a HEI distributor, my SB Gen1 350 is completely stock. I decided that after 50,000 miles it was about time to replace the plugs. The thing I immediately noticed was that they are burning very lean. The plugs are AC Delco R44TS. I was wondering if I should go with a shorter tip R44T or maybe a colder R43TS. Other than the lean condition, the engine runs great and doesn't ping under any condition.



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