426 HEMI piston experts!

[Meep-Meep]

Does anyone have an idea what compression these are from these pics? They are for a stock stroke crank. Thanks. They are for sale by the way, but I'd like to have an idea what they are. .005" over.

 

[69Bee]

Any part numbers? I have old DC catalogs to look them up.

 

[69hemibeep]

Just by appearance I'd guess at 10.25-1 but maybe higher. The factory made .005 over pistons but I'm not aware of any one else that made them. They look like mine and should have a part #.

 

[Meep-Meep]

These are Venolia forged. I was thinking the dome might be too high for 10.25:1 but then again it's not like I tore down a bunch of hemis. I had some people say they looked like 13:1 but that didn't seem right. I thought those pretty much looked like a pup tent (no flat spot in the center). I suppose I can send the pic to Venolia. Anyone have a pic of a factory street hemi piston?

 

[lewtot184]

pretty sure they're 12.5's. there was a 13.5 pro-stock piston in the early '70's but it had a little more dome.