eran tomer
I'm Awesome
so if a head is stamped 193 it's iron and not aluminum?The standard 193 TBI cast iron head takes 5/8" taper seat plugs. The Vortec head AND any aluminum head takes 3/4" long reach plugs. As an example, the last letters on an ACDelco plug is TS (Taper Seat) for TBI and LTS (Long Taper Seat) for Vortec.