I have a set of probe forged pistons that were in my engine for 1 season. They are in GREAT condition , Asking $200 + shipping.
I used these with a 4.500 stroke crank and a 6.700 rod to make a 545 cubic inch 11.5 to 1 compression engine with 76cc combustion chambers.

They are part number 12330-030

Item Code 12330
Vendor Name Probe Industries
Product Type Pistons
Product Model Sportsman Race Series - SRS
Engine Displacement (cu.in.) 532/557
Engine Family FORD-LINCOLN-MERCURY - Big Block V8
Material 2618-t61 Forged Aluminum
Base Bore (in) 4.360
Stroke (in) 4.300/4.500
Rod Length (in) 6.800/6.700
Compression Height (in) 1.350
Top Type Dish Top
Net Head Volume (cc) -22.0
Dish Depth (in) -0.110
Deck Thickness (in) 0.190
Valve Pocket Cutters 2.400 I - 0.000 E
Valve Pocket Depth (in) .270 I - .000 E
Weight Without Pin (g) 536
Wrist Pin Diameter (in) 0.990
Wrist Pin Length (in) 2.930
Wrist Pin Weight (g) 151
Pin Lock Type Dbl Spiral
Ring Set # 315-0025
Top Ring Groove Size 1/16 in.
Second Ring Groove Size 1/16 in.
Oil Ring Groove Size 3/16 in.
Top Ring Land (in) 0.320
Second Ring Land (in) 0.160
Bottom Ring Land (in) 0.085
Oil Rail Support Part # 10205
Quantity Sold in sets of 8.



The only reason I took them out was to go with more compression.