Free Shipping on Piston Orders Over $500.00! Online Purchases Only. Limited Time Offer. Continental U.S. Only.

Olds 442

Big Block Oldsmobile

Clear all
STEP 1: Choose Cyl Bore Size Show all STEP 1: Choose Cyl Bore Size
STEP 2: Piston Series Show all STEP 2: Piston Series
STEP 3: Connecting Rod Length Show all STEP 3: Connecting Rod Length
STEP 4: Piston Pin Diameter Show all STEP 4: Piston Pin Diameter
STEP 6: Top - Comp. Ratio Show all STEP 6: Top - Comp. Ratio
Compression Height Show all Compression Height
Crankshaft Stroke Show all Crankshaft Stroke
6020-4185 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.185 inch bore Pin Dia.: 0.98 6020-4185 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.185 inch bore Pin Dia.: 0.98
from $749.95
from $749.95
437 Big Block Oldsmobile, FX, Comp Height: 1.625, -12cc Flat Top , PIN: .98", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 3.975", ROD: 7, Approx Comp Ratio: 72cc-10.62, 75cc-10.32, 77cc-10.13 Effective June 15th 2026, These Oldsmobile ring grooves have been updated to the new specifications of 1.2-1.2-3mm. Parts manufactured prior to this date feature ring grooves with dimensions of 1/16-1/16-3/16.
Choose Options
6020-4165 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.165 inch bore Pin Dia.: 0.98 6020-4165 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.165 inch bore Pin Dia.: 0.98
from $749.95
from $749.95
433 Big Block Oldsmobile, FX, Comp Height: 1.625, -12cc Flat Top , PIN: .98", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 3.975", ROD: 7, Approx Comp Ratio: 72cc-10.55, 75cc-10.25, 77cc-10.05 Effective June 15th 2026, These Oldsmobile ring grooves have been updated to the new specifications of 1.2-1.2-3mm. Parts manufactured prior to this date feature ring grooves with dimensions of 1/16-1/16-3/16.
Choose Options
6020-4155 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.155 inch bore Pin Dia.: 0.98 6020-4155 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.155 inch bore Pin Dia.: 0.98
from $749.95
from $749.95
431 Big Block Oldsmobile, FX, Comp Height: 1.625, -12cc Flat Top , PIN: .98", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 3.975", ROD: 7, Approx Comp Ratio: 72cc-10.5, 75cc-10.21, 77cc-10.02 Effective June 15th 2026, These Oldsmobile ring grooves have been updated to the new specifications of 1.2-1.2-3mm. Parts manufactured prior to this date feature ring grooves with dimensions of 1/16-1/16-3/16.
Choose Options
6020-4125 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.125 inch bore Pin Dia.: 0.98 6020-4125 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.125 inch bore Pin Dia.: 0.98
from $749.95
from $749.95
425 Big Block Oldsmobile, FX, Comp Height: 1.625, -12cc Flat Top , PIN: .98", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 3.975", ROD: 7, Approx Comp Ratio: 72cc-10.39, 75cc-10.1, 77cc-9.9 Effective June 15th 2026, These Oldsmobile ring grooves have been updated to the new specifications of 1.2-1.2-3mm. Parts manufactured prior to this date feature ring grooves with dimensions of 1/16-1/16-3/16.
Choose Options
6020-4060 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.060 inch bore Pin Dia.: 0.98 6020-4060 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.060 inch bore Pin Dia.: 0.98
from $749.95
from $749.95
412 Big Block Oldsmobile, FX, Comp Height: 1.625, -12cc Flat Top , PIN: .98", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 3.975", ROD: 7, Approx Comp Ratio: 72cc-10.13, 75cc-9.83, 77cc-9.66 Effective June 15th 2026, These Oldsmobile ring grooves have been updated to the new specifications of 1.2-1.2-3mm. Parts manufactured prior to this date feature ring grooves with dimensions of 1/16-1/16-3/16.
Choose Options
6020-4040 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.040 inch bore Pin Dia.: 0.98 6020-4040 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.040 inch bore Pin Dia.: 0.98
from $749.95
from $749.95
408 Big Block Oldsmobile, FX, Comp Height: 1.625, -12cc Flat Top , PIN: .98", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 3.975", ROD: 7, Approx Comp Ratio: 72cc-10.04, 75cc-9.76, 77cc-9.59 Effective June 15th 2026, These Oldsmobile ring grooves have been updated to the new specifications of 1.2-1.2-3mm. Parts manufactured prior to this date feature ring grooves with dimensions of 1/16-1/16-3/16.
Choose Options
6020-4030 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.030 inch bore Pin Dia.: 0.98 6020-4030 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.030 inch bore Pin Dia.: 0.98
from $749.95
from $749.95
406 Big Block Oldsmobile, FX, Comp Height: 1.625, -12cc Flat Top , PIN: .98", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 3.975", ROD: 7, Approx Comp Ratio: 72cc-10, 75cc-9.72, 77cc-9.54 Effective June 15th 2026, These Oldsmobile ring grooves have been updated to the new specifications of 1.2-1.2-3mm. Parts manufactured prior to this date feature ring grooves with dimensions of 1/16-1/16-3/16.
Choose Options
6020-4000 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.000 inch bore Pin Dia.: 0.98 6020-4000 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.000 inch bore Pin Dia.: 0.98
from $749.95
from $749.95
400 Big Block Oldsmobile, FX, Comp Height: 1.625, -12cc Flat Top , PIN: .98", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 3.975", ROD: 7, Approx Comp Ratio: 72cc-9.88, 75cc-9.61, 77cc-9.43 Effective June 15th 2026, These Oldsmobile ring grooves have been updated to the new specifications of 1.2-1.2-3mm. Parts manufactured prior to this date feature ring grooves with dimensions of 1/16-1/16-3/16.
Choose Options