Cosmic Charlie

This motor is transplanted in to my 69 Cutlass ...

from ClassicOlds -- A '70 455 could be either 9:1, 10.25:1, or 10.5:1.
The 9:1 pistons had a half-moon notch at the front-facing side.
The 10.25:1 pistons had a V-shaped notch.
The 10.5:1 pistons were flat tops, with no dish.

Any Idea which Piston this is ? What Car it was in ? I see a single V notch (?) so 10.25:1
Block Stamp - 30M209943
Block Casting # - 396021F
Heads # - E - 403686
Intake = 404521

my new $ 19.99 Bore Scope - 1st picture I ever took with it LOL

Cosmic Charlie

I turned up the light on this one

joe_padavano

Yes, that is 10.25:1.

Cosmic Charlie

Thank You (again !)