Hard to beat the 45s for factory street stuff...April 20 2017 at 4:59 AM
doug smith (Login cjshaker)
Response to Best Spark plug
I had an MSD Blaster in my '68 F250 Highboy, 390 with C4 heads, and those plugs lasted 20 years without missing a beat and STILL looked great when I tore the engine down. I use them in the stock 390 in my '65 Galaxie and even my MR headed 427 in the Mach. Never any issues, although I do switch to the 124's in the Mach for racing. I've also used the NGK WR5, which is the equivalent to the Autolite 45.