the only markings on them are a "960P" on one side and "FEB .95" on the other.

engine is a '69 455 .030 over. stock crank, far as i know stock cam, J heads.

 

Those look like 40cc stock dish replacements.
Yuk!
That motor is probably at or just below 8:1 compression at the moment, if the heads haven't been milled any.

 

How much soup do you get with them?

 

I recall seeing something that looks very familiar at my friends garage with cigarette butts and ashes in them!

 

the dish measures at .340 to .360

very hard to measure

 

after doing a little research i think these are sealed power pistons. the date mark and the 3 digit "P" number both look like marks on some of their older products. i was unable to find anything searching for the 960P number, maybe discontinued. anyone know how to check on the older numbers?

 

Typical factory replacement lo-comp pistons but forged so thats a plus. Good for the street. Don't worry about compression on the street in your Delta conv. I have similar pistons in my 71 Royale conv. I built it for torque and it moves out pretty good. I have tube headers, performer intake/holley/small converter. Build a nice "streeable" engine and it will be much more enjoyable driving. I have a comp's cam .456/.456 cam in mine. I like the cam. Ken

 

thanks kenny. im thinking ill clean em up and put them back in. after checking around for upgrades i dont think i want to drop 4-6 hundred bucks on better ones..... but i think ill put better heads over them. im looking at tearing apart my "J" heads anyway.... might as well put the time into some "C"s or a guy on here that lives in my state has some "G"s coming up for sale soon. know anything about the "G"s? the good, bad, ugly.

 

how would i go about buying the correct rings for these pistons, not knowing exactly what they are? is there a huge variety of sizes and brands that could lead me to make a fatal error? i know i need to get .030 over...

 

Uhhh, my money is on that those are cast pistons, not forged. Got a set of standard ones sitting in my garage.

You can get a better pistons for less than $400.00 and you might want to have those checked first before you buy rings.

As far as rings go any .030 over 5/64, 5/64, 3/16 ring pack will do. Sealed Power makes a good one for not a lot of money. Don't buy Moly type though if you're not going to hone it for that. Takes a different wall finish to be correct. Standard bore is 4.125, 4.155 is .030 over.

 

going .060 over on my cylinders. junking these pistons. my block will get bigger holes so i posted a new thread about a couple deals i see on ebay.

 

You can buy good pistons at a decent price from suppliers like Jegs and Summit. I put TRW 2323F pistons in my 455. They are forged and don't have the low compression dog dishes. They aren't much more expensive than a set of stock pistons.