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Early Pontiac GTO

Pontiac 4.250 Stroke

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
6130-4120 455 - 4.250 Stroke Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.120 inch bore Pin Dia.: 0.99 6130-4120 455 - 4.250 Stroke Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.120 inch bore Pin Dia.: 0.99
from $749.95
from $749.95
453 Pontiac Late , FX, Comp Height: 1.285, -7cc Flat Top , PIN: .99", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 4.250", ROD: 6.8, Approx Comp Ratio: 62cc-12.95, 87cc-10.03, 124cc-7.64 Effective June 15th 2026, These Pontiac 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.
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6135-4190 455 - 4.250 Stroke Pontiac Late FX Series -18cc Dish Top Pontiac Late Forged Piston Set 4.190 inch bore Pin Dia.: 0.99 6135-4190 455 - 4.250 Stroke Pontiac Late FX Series -18cc Dish Top Pontiac Late Forged Piston Set 4.190 inch bore Pin Dia.: 0.99
from $749.95
from $749.95
469 Pontiac Late , FX, Comp Height: 1.285, -18cc Dish Top, PIN: .99", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 4.250", ROD: 6.8, Approx Comp Ratio: 62cc-11.8, 87cc-9.42, 124cc-7.36 Effective June 15th 2026, These Pontiac 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.
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6135-4150 455 - 4.250 Stroke Pontiac Late FX Series -18cc Dish Top Pontiac Late Forged Piston Set 4.150 inch bore Pin Dia.: 0.99 6135-4150 455 - 4.250 Stroke Pontiac Late FX Series -18cc Dish Top Pontiac Late Forged Piston Set 4.150 inch bore Pin Dia.: 0.99
from $749.95
from $749.95
460 Pontiac Late , FX, Comp Height: 1.285, -18cc Dish Top, PIN: .99", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 4.250", ROD: 6.8, Approx Comp Ratio: 62cc-11.61, 87cc-9.27, 124cc-7.24 Effective June 15th 2026, These Pontiac 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.
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6135-4125 455 - 4.250 Stroke Pontiac Late FX Series -18cc Dish Top Pontiac Late Forged Piston Set 4.125 inch bore Pin Dia.: 0.99 6135-4125 455 - 4.250 Stroke Pontiac Late FX Series -18cc Dish Top Pontiac Late Forged Piston Set 4.125 inch bore Pin Dia.: 0.99
from $749.95
from $749.95
454 Pontiac Late , FX, Comp Height: 1.285, -18cc Dish Top, PIN: .99", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 4.250", ROD: 6.8, Approx Comp Ratio: 62cc-11.47, 87cc-9.18, 124cc-7.17 Effective June 15th 2026, These Pontiac 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.
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6135-4125 400 - 4.250 Stroke Pontiac Late FX Series -18cc Dish Top Pontiac Late Forged Piston Set 4.125 inch bore Pin Dia.: 0.99 6135-4125 400 - 4.250 Stroke Pontiac Late FX Series -18cc Dish Top Pontiac Late Forged Piston Set 4.125 inch bore Pin Dia.: 0.99
from $749.95
from $749.95
454 Pontiac Late , FX, Comp Height: 1.285, -18cc Dish Top, PIN: .99", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 4.250", ROD: 6.8, Approx Comp Ratio: 62cc-11.47, 87cc-9.18, 124cc-7.17 Effective June 15th 2026, These Pontiac 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
6135-4120 455 - 4.250 Stroke Pontiac Late FX Series -18cc Dish Top Pontiac Late Forged Piston Set 4.120 inch bore Pin Dia.: 0.99 6135-4120 455 - 4.250 Stroke Pontiac Late FX Series -18cc Dish Top Pontiac Late Forged Piston Set 4.120 inch bore Pin Dia.: 0.99
from $749.95
from $749.95
453 Pontiac Late , FX, Comp Height: 1.285, -18cc Dish Top, PIN: .99", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 4.250", ROD: 6.8, Approx Comp Ratio: 62cc-11.47, 87cc-9.16, 124cc-7.15 Effective June 15th 2026, These Pontiac 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
6130-4180 455 - 4.250 Stroke Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.180 inch bore Pin Dia.: 0.99 6130-4180 455 - 4.250 Stroke Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.180 inch bore Pin Dia.: 0.99
from $749.95
from $749.95
467 Pontiac Late , FX, Comp Height: 1.285, -7cc Flat Top , PIN: .99", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 4.250", ROD: 6.8, Approx Comp Ratio: 62cc-13.26, 87cc-10.3, 124cc-7.84 Effective June 15th 2026, These Pontiac 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
6130-4125 455 - 4.250 Stroke Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.125 inch bore Pin Dia.: 0.99 6130-4125 455 - 4.250 Stroke Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.125 inch bore Pin Dia.: 0.99
from $749.95
from $749.95
454 Pontiac Late , FX, Comp Height: 1.285, -7cc Flat Top , PIN: .99", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 4.250", ROD: 6.8, Approx Comp Ratio: 62cc-12.97, 87cc-10.05, 124cc-7.65 Effective June 15th 2026, These Pontiac 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