Flat Seat spark plugs? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Nelson · 08-05-2003, 11:18 PM

This might be a studip question, be what exactly are Flat seat spark plugs. Are those the R43 (13/16")? My 441 Heads are suppose to take flat head spark plugs, and I think the regular R44TS might be to long. Any help would be appreciated.

Nelson · 08-05-2003, 11:45 PM

ttt

oldsub86 · 08-05-2003, 11:49 PM

a bit of a guess here but my recollection is that most newer models have spark plugs that have a tapered seat on them just above the threads. Older style heads had plugs with a flat seat and the washers that compressed a bit the first time the plugs were tightened in.

biddaboy · 08-06-2003, 02:15 AM

I use R-44 in all my old style heads with the large plugs and dont forget the washers. biddaboy

dmec · 08-06-2003, 03:08 AM

any ac plug with a t in it stands for tapered seat which does not require a gasket and will not seat properly in early heads. i havent been able to find r44 or r45 plugs. can find r45s. the s stands for extended tip which means the shell doesnt shroud the tip. so stay away from a plug with a t after the number but any number alone or with a s after the number will work.

08-05-2003, 11:18 PM	#1
Nelson Registered User Join Date: Jun 2001 Location: cambridge,ont,canada Posts: 128	Flat Seat spark plugs? This might be a studip question, be what exactly are Flat seat spark plugs. Are those the R43 (13/16")? My 441 Heads are suppose to take flat head spark plugs, and I think the regular R44TS might be to long. Any help would be appreciated. __________________ Nelson 1970 C10 350 Auto. A/C not Working

08-05-2003, 11:45 PM	#2
Nelson Registered User Join Date: Jun 2001 Location: cambridge,ont,canada Posts: 128	ttt __________________ Nelson 1970 C10 350 Auto. A/C not Working

08-05-2003, 11:49 PM	#3
oldsub86 Registered User Join Date: Dec 2002 Location: Canada Posts: 695	a bit of a guess here but my recollection is that most newer models have spark plugs that have a tapered seat on them just above the threads. Older style heads had plugs with a flat seat and the washers that compressed a bit the first time the plugs were tightened in. __________________ 1968 Chevy - 292 with a powerglide

08-06-2003, 02:15 AM	#4
biddaboy Registered User Join Date: Mar 2003 Location: Port Alberni.B.C. Canada Posts: 149	I use R-44 in all my old style heads with the large plugs and dont forget the washers. biddaboy

08-06-2003, 03:08 AM	#5
dmec Senior Member Join Date: Jun 2000 Location: yucaipa ca Posts: 580	any ac plug with a t in it stands for tapered seat which does not require a gasket and will not seat properly in early heads. i havent been able to find r44 or r45 plugs. can find r45s. the s stands for extended tip which means the shell doesnt shroud the tip. so stay away from a plug with a t after the number but any number alone or with a s after the number will work.



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