Best spark plug for my combo
Posted: Mon Oct 09, 2017 9:30 pm
383 sbc srp dome pistons 12.5.1 dart sportsman 2 heads I’m using ac delco R42ts now. Just looking to optimize my combo. I’m also running VP- c12 gas.
That plug may still be too hot for that amount of compression and iron heads.
I use an auto light racing plug AR-133 or AR 134