Piston identification help

[Dusterdude72]

Thanks for the info toolmanmike!

 

[T67POWER]

Was this motor running before you pulled it apart????

They are poly pistons installed in a newer LA motor.

 

[Dusterdude72]

Was this motor running before you pulled it apart????

They are poly pistons installed in a newer LA motor.

Yes the engine ran before I pulled it apart.

I was told it only had 12,000 miles on it since it had been built.....which it looked like when pulling it apart.

But it was most likely built many years ago and only accumulated 12,000 miles over the period of time.

so I pulled it apart and refreshed all the gaskets and timing set and put new paint on and found a couple of bad crank bearings and that the crank had poor machining work so I got a new crank and bearings and installed them,headers,intake,carb and so on.....mostly bolt ons I have done to it otherwise everything is just as it was before I bought it including the cam and it was a running engine and I was told it pulled the 66 dodge coronet it was originally in into the 13's in the quarter.

 

[2 Darts]

Here's what the early LA 318 pistons looked like. This engine is from a 1968 Coronet. Hope this photo helps.

 

[Dusterdude72]

Here's what the early LA 318 pistons looked like. This engine is from a 1968 Coronet. Hope this photo helps.

Thanks for the picture..............

I know what engine I have, I know what year it is, ...the only thing I was unsure of was what type of pistons were in it and what everyone thought of the pistons combined with the rest of my setup /specs

I am pretty sure we have all came to the conclusion that they are 30 over poly pistons.

Thanks to all who have gave input on the hole thing

 

[T67POWER]

Just run the engine the way it is.
The motor won't know the difference.
When you get it running again do a cranking pressure test.
I wonder what your compression really is????
The A poly motor combustion chamber is round more like a hemi ,and if those pistons are let's say-- 9 to 1-- for a poly motor, they might wind up bumping your compression up higher in a modern (a--engine) that has a flatter combustion chamber.
You might have a faster motor because of it.:thumrigh:

 

[Dusterdude72]

Just run the engine the way it is.
The motor won't know the difference.
When you get it running again do a cranking pressure test.
I wonder what your compression really is????
The A poly motor combustion chamber is round more like a hemi ,and if those pistons are let's say-- 9 to 1-- for a poly motor, they might wind up bumping your compression up higher in a modern (a--engine) that has a flatter combustion chamber.
You might have a faster motor because of it.:thumrigh:

Thanks for the tip T67, I didnt even think about the combustion chamber shape of a poly head until you mention it, you may be right about it bumping the compression up.