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Sparkplugs 1963 gmc
#1379254 Fri Oct 02 2020 01:22 PM
Joined: Mar 2019
Posts: 1,072
G
Shop Shark
My application is 1963 GMC 305e motor. What sparkplugs are required and available for this motor? Resistor or nonresistor type? Or does it matter? Any help is appreciated. Not finding a clear answer anywhere..

Re: Sparkplugs 1963 gmc
glenns towing #1379258 Fri Oct 02 2020 02:22 PM
Joined: Aug 2018
Posts: 276
D
Shop Shark
The '66 AC Spark Plug Catalog shows spark plug 45NS as correct for the 305E engine. That crosses to the AC R45XLS, available currently. Both are 3/4" reach plugs. The original 45NS was partially threaded, and the R45XLS is fully threaded on the reach. Shouldn't matter, nor should the fact that it is a resistor plug. If originality is any concern, NOS 45NS plugs pop up on eBay occasionally.

Doug

Re: Sparkplugs 1963 gmc
glenns towing #1379260 Fri Oct 02 2020 02:47 PM
Joined: Mar 2019
Posts: 1,072
G
Shop Shark
Thanks. But all i can find is " ac r44xls" locally. Or a champion "r n12yc". Would you use either of these?

Re: Sparkplugs 1963 gmc
glenns towing #1379264 Fri Oct 02 2020 03:30 PM
Joined: Apr 2005
Posts: 1,788
R
Shop Shark
The "44" series is a colder plug. It's better to stay with the correct heat range.
Fred

Re: Sparkplugs 1963 gmc
glenns towing #1379269 Fri Oct 02 2020 04:07 PM
Joined: Aug 2018
Posts: 276
D
Shop Shark
RockAuto has 'em on close-out sale at $0.71 each: R45XLS [rockauto.com]. FWIW, I usually hold off on ordering from RockAuto until I have enough that the shipping doesn't outweigh their low prices. But, plugs are light so might be a good deal even with shipping cost, since the price is certainly right. They are good about shipping fast, too.

Doug

Re: Sparkplugs 1963 gmc
glenns towing #1379301 Fri Oct 02 2020 08:25 PM
Joined: Mar 2019
Posts: 1,072
G
Shop Shark
Thanks guys. I went ahead with the 44s. I realize theyre a step down but will see what if anything happens. Also figured while i was in tuneup mode , id adjust valves. I should've took a pic. Not one spec of sludge and the vavle springs were still nicely painted grey. Couldnt believe it if i didnt see it myself. Oh and a tick quited down a bunch after servicing them.. Im a happy camper to say the least, so i thought id share. Have a great weekend 😀

Re: Sparkplugs 1963 gmc
glenns towing #1379373 Sat Oct 03 2020 02:10 PM
Joined: Mar 2019
Posts: 1,072
G
Shop Shark
Hey Drdoug, appreciate the rockauto heads up and figured id grab them for future use. But the number of plugs available is only 1. thumbs_up

Re: Sparkplugs 1963 gmc
glenns towing #1379430 Sat Oct 03 2020 10:27 PM
Joined: Aug 2018
Posts: 276
D
Shop Shark
Ha! that wouldn't be too good. Sorry about that, but, all you had to do was change the drop down to their regular inventory in the little box in the middle of the part entry, and they have them in stock at $1.40. Guess I should've explained better...

Re: Sparkplugs 1963 gmc
glenns towing #1379431 Sat Oct 03 2020 10:28 PM
Joined: Aug 2018
Posts: 276
D
Shop Shark
Ha! that wouldn't be too good. Sorry about that, but, all you had to do was change the drop down to their regular inventory in the little box in the middle of the part entry, and they have them in stock at $1.40. Guess I should've explained better...

Doug

Re: Sparkplugs 1963 gmc
glenns towing #1379442 Sat Oct 03 2020 11:26 PM
Joined: Mar 2019
Posts: 1,072
G
Shop Shark
Lol. No biggie. At least i know what im after next time around. It was NOT your explanation, it was probably the recipient, me, ha and or the rockauto website that didnt offer em up when clicked on. Why would there be 1 on sale and others at regular price.? Thanks again for your time and effort. Much appreciated.


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