First is 1.937 these I think are the 67 440.
I have my original set of 67s. They are 2.00 and some change. 2.003" I think. My 68-69 (have we decided if 70 is the same?) pistons are 2.034", I think. I need to go out measure again, and write these down, as it seems to come up a few times a year.
Compression height is measured from the center of pin and my 70 standard pistons are under 2 inches and are the same as the TRW L2266 (69). All those measurements I did before are from the pin center.
Right, measured from the pin centerline. The actual original replacement piston for 68-69 is not the TRW L2266. That is what they will let you use today for NHRA and allowing block machining to the compression height. This is because this is the only piston available that is close, I suspect. The original 68-69 NHRA replacement piston was the the L2286 (I have these as well). These were discontinued in the late 1980s. I did just measure my 67 original piston, 2.002" although the mic, piston and pin were about 25°F.
