[69L78]

1 box of 8 NOS R45S Acniter with the 4 thin green lines, boxes are dated 1972. These have the extended eletrode. Here is a quote from John Hinckley (aka JohnZ) from the Corvette forum. I have used these regularly in L-76's, L-79's, and Z/28's (all of which have factory domed pistons) and have never had a problem. These are listed in the AC catalog for the following applications.

65-68 Camaro, Chevelle, Chevy II, Chevrolet, V8 327

67-70 GTO, Firebird V8 350, 400, and 455 4-Bbl

61-70 Plymouth, Dodge V8 383 2 Bbl.

$56 shipped in the lower 48