I’m trying to identify these aftermarket 340 pistons from a 30 year old build. the casting number is 1029p . I had the short block rebuilt when i was in high school. I don’t remember specs . I remember the guy taking me into lowering compression ratio to run pump gas. Probably because i was a broke kid who couldn’t afford new forged pistons at the time had something to do with it lol. If anyone can identify these pistons that would be awesome, Thanks!
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