R43 Spark Plugs don't fit in crate engine? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

saxart · 09-23-2017, 02:48 PM

I just tried to install some AC Delco R43 spark plugs in the crate engine (190hp 350SBC) in "Old Roy" and they won't thread into the spark plug holes. I had a set of older (used) AC Delco 41-905's (tapered seat) and they went right in. I'm guessing the R43's are the wrong plug for this engine? Should I run a new set of the 41-905s? Or something else?? For what it's worth, I'm running a Skip White HEI distributor and plan to gap the plugs @ .45

Thanks!

harpo231 · 09-23-2017, 02:55 PM

(AC Delco p/n 065-R45TS, Autolite p/n 417-144)

09-23-2017, 02:48 PM	#1
saxart Registered User Join Date: Aug 2012 Location: St. Croix River Valley, WI Posts: 795	R43 Spark Plugs don't fit in crate engine? I just tried to install some AC Delco R43 spark plugs in the crate engine (190hp 350SBC) in "Old Roy" and they won't thread into the spark plug holes. I had a set of older (used) AC Delco 41-905's (tapered seat) and they went right in. I'm guessing the R43's are the wrong plug for this engine? Should I run a new set of the 41-905s? Or something else?? For what it's worth, I'm running a Skip White HEI distributor and plan to gap the plugs @ .45 Thanks! __________________ Meet "Old Roy": http://67-72chevytrucks.com/vboard/s...d.php?t=707801

09-23-2017, 02:55 PM	#2
harpo231 Registered User Join Date: Nov 2014 Location: Lincoln City DE Posts: 1,292	Re: R43 Spark Plugs don't fit in crate engine? (AC Delco p/n 065-R45TS, Autolite p/n 417-144) __________________ Stan 67 swb BLU MULE posted via flip-fone

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