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tabragg
03-20-2009, 02:21 AM
:machine:need opinions on spark plugs for a 12.1 302 . 1967 corvette heads with 205 valves. running 110 octane most of the time . 118 when i can get it. any input would be greatly appreciated.

MonzaRacer
04-27-2009, 09:12 PM
If those are double humps look for R43 or R44, with big domes you wont get to run a R43 or R44s. if you cant get AC Delco try matching them to Motorcraft or even Bosch Supers, but get 2 or 3 extra supers as I usually find one or 2 that just dont have quality I like, and better have some serious coil/module like a DUI HEI or MSD setup. I do happen to have a small cap GMPP (MSD dist) with GMPP box thats same as MSD 6T.
Not fan of Autolites or Chmpiopns. Good Luck.

70camaro406
07-03-2009, 04:18 AM
When I ran a set of 186's (DZ302/LT-1 350 heads) on my 350 and my 406, I always had good luck using Autolite AR72's. They are a short reach, short electrode race plug made for domed pistons (I had domed 11:1 pistons in my 350). They're also available at NAPA stores pretty cheap. That's what my machine shop recommended to me (and they race super stock).