Can anyone tell me what pistons are in my 409 here is a pic they are 30 0ver

[pepemotorsports]

I can’t find any other markings on them
Thanks
Pepemotorsports

 

[Don Jacks]

These are the Truck,Marine,and industrial pistons.Very low compression ratio,and of cast aluminum construction.They make good ashtrays but that's about it.

 

[pepemotorsports]

I’m putting it in a 57 Chevy
456 olds rear
Only using it for street cruise
Will it be ok?
Or should I change the Pistons
It has recently been rebuilt.
Thanks It’s a t3 block QC
Paul

 

[pepemotorsports]

Sorry 63 Block
QC
Also it’s a 4 speed car
If not what would be a nice set of pistons and rods for what I’m using it for
Thanks

 

[La Hot Rods]

To do it proper you would need to have the engine machined for new pistons.
The KB Icon for the big block chevy rods look like a good choices for a street engine and easy on the budget.
Check in Show Cars catalog.

 

[pepemotorsports]

Since it was recently rebuilt, would’t I just need to horn And Install 30 over Pistons ?
Thanks

 

[La Hot Rods]

You have to see what size the new pistons are and what your bore measures.

 

[pepemotorsports]

Gotcha !
Thanks

 

[Skip FIx]

And probably rebalance crank, doubt they weight the same .

 

[Don Jacks]

The Icon piston will take a bore/hone an extra .008 .They are available in .028 thur .078 sizes,and use the 440 Mopar ring pack.You can get the Ross pistons[ more expensive] in the typical .030,ect.,and either way a rebalance of the rotating assembly is needed.

 

[1958 delivery]

Doesn't look very recent rebuild to me. Since some one used those pistons in a good QC block I would not take a chance on anything that was done to that engine. I would completely disassemble and do it right.

 

[pepemotorsports]

Point well taken
What is the compression on those type of pistons?

 

[Don Jacks]

7.75-1 in a truck block,in that car block,about 8.5-1.