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Pontiac 389

Pontiac 389

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
6104-4180 389 Pontiac Early and Late FX Series -14cc Dish Top Pontiac Early and Late Forged Piston Set 4.180 inch bore Pin Dia.: 0.98 6104-4180 389 Pontiac Early and Late FX Series -14cc Dish Top Pontiac Early and Late Forged Piston Set 4.180 inch bore Pin Dia.: 0.98
from $749.95
from $749.95
412 Pontiac Early and Late, FX, Comp Height: 1.71, -14cc Dish Top, PIN: .98", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 3.750", ROD: 6.625, Approx Comp Ratio: 62cc-10.92, 87cc-8.68, 124cc-6.74 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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6100-4080 389 Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.080 inch bore Pin Dia.: 0.98 6100-4080 389 Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.080 inch bore Pin Dia.: 0.98
from $749.95
from $749.95
392 Pontiac Late , FX, Comp Height: 1.71, -7cc Flat Top , PIN: .98", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 3.750", ROD: 6.625, Approx Comp Ratio: 62cc-11.36, 87cc-8.83, 124cc-6.75 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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