As posted they are good pistons, your look like the old trw and would have the triangle T on the underside.

Yes they are heavy, these are for a lil 318 project and at 767 grams are only 40 grams lighter the the domed venollia? I have in a 360 currently.

You can still find them new (old) for $300 on ebay semi often.

Since they have been made by so many there is alot of confusion on piston to wall specs as some of the newer spec less.

Ive a set in my v code runner I turned backwards and they have been in since 86 and rattle like a old gm diesel but they run hard.

These were within 3 grams of each other out of the box and easy to get within 3/10s.