What spark plugs do I use for my vortec heads (96-99 SBC)? I know they are picky and they have to be longer than normal SBC plugs, but what gap, brand, and heat range should I look for? After two weeks of cussing, I figured out my ignition problems were the plugs, so im off for new ones. I used autolite (all the parts store sells) and I dont want platinum plugs because I've heard the have a general heat range and not the best thing for the vortec heads. Thanks guys.