Gmc 302 spark plug recommendations

New To the Site I Love It Great Information!

Running a GMC 302 In a 1949 CHEVROLET 3600 Three On The Tree w/BW Overdrive just completed most of a Tune Up had been Running NGK B6S Plugs but are Dirty & Wet a crossed All GMC 302 Years Factory recommended AC 44 which are NLA but some are Running AC R45,R45S with NAPA 700165 Resistor Wires which I just installed any Input appreciated.

Thanks!

Mike

 

Welcome. Love the 302 Jimmy! Is that military surplus? How about some more pics of your pickup?

 

Morning Thanks for the compliment!

Tried to Upload more Images however unsuccessful have emailed Webmaster for Help.

Do You have any Input on Spark Plug Choices for GMC 302 ?

Have A Great Day!

Mike

 

Morning Thanks for the compliment!

Tried to Upload more Images however unsuccessful have emailed Webmaster for Help.

Do You have any Input on Spark Plug Choices for GMC 302 ?

Have A Great Day!

Mike

 

I use NGK B6S in mine and replace them at 5,000 mi intervals.

 

Morning

Thanks for the Reply,yes I too Use NGK B6S however notice a lot of Carbon and Wet so was wondering about AC R45S Extended Plug being an OHV Engine ?

Thanks!

Mike

 

Welcome from Virginia.

 

Thanks for the Welcome!

OK went with AC R45 Installed Runs FANTASTIC will take for a Ride next nice Day and inspect for Carbon & Wet

Dwell steady 37 Timing Advanced a bit seems to like that Setting per the Vacuum Readings so All Is Good!

 

I use NGK 3332 with a mini HEI. I am running a set gapped at 0.050 that work much better than the original AC R44 plugs. Starts easier and idles smoother.

 

Thank You motion guru !

Yes thats what I understand to be the case a lot of improvement HEI Conversion for now Im holding on to some originality and actually enjoy tinkering now if and when I begin to have to Call AAA well then maybe Id consider HEI.

Have A Great Day!

Mike

 

My HEI is from an early 80's V6 S10 and has a vacuum advance. Bottom tuned down to fit into the GMC distributor bore and the shaft cut, bored and a stock GMC distributor shaft section with gear and tang stabbed in and pinned with the gear retainer pin.

Looks close enough to stock to fool the casual looker. Running a 0.6 ohm Pertronix Flame thrower coil - looks like the original. Magnecore wires and it all came together nicely.