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Author Topic:   Sparkplug Questions??????
Speed Racer X
posted March 30, 2003 10:35 PM
I have always been die hard to the good 'ol AC Delcos.

Get off your asphalt
Do it in the DIRT!

posted March 30, 2003 11:31 PM
same here ac r45ts. a couple things you might want to check is make sure your fuel line is'nt geting pinched and also make sure it's not hitting anything hot i had a miss one nite out of nowhere turned out to be the line from my fuel pump to the carb was rubbing on the bottom radiator hose and boiling the fuel before it had a chance to get to the carb

rico 08
posted March 31, 2003 12:39 PM
I have to agree with '54,GM recommends a R44 in their high performance motors on the older heads(flat gasket)and the R43 you we're running are a little cold,the NGK plug you are now using ,if i crossed it right comes out to a 41 heat range in an ac which is the coldest plug they make and will probably foul out at idle rather quickly,i'd switch back to the R43 as the coldest plug to run and maybe even a R44 to keep it from fouling.

DMA Racing
posted March 31, 2003 03:32 PM
i use the 303's,on 461 heads 30 over flat top

posted March 31, 2003 05:21 PM
383 Camel Hump Heads with 11.5(?)C/R. I use Autolite #85 gapped at .040 with the side electrode cut back like the racing series plugs.

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