Yeah, the plug that shot out was a Dorman 1 3/4" replacement. I replaced them all prior to putting the motor in and hadn't noticed this plug said clearly "1 3/4" on it. The other 5 are actually the 1 49/64 plugs. I already broke the bank and bought the proper plug for all of $0.59 But again, a block heater would be a handy thing to have.

So if all 6 are the same size then the block heater directions were probably just for efficiency's sake like i was thinking.

Thanks!

Justin