Load image into Gallery viewer, 3-3275-4040-Boss 331 Stroker-Small Block Ford 289 - 302 FX3 Series +7.5cc  Dome Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.04 inch bore
Load image into Gallery viewer, 3-3275-4040-Boss 331 Stroker-Small Block Ford 289 - 302 FX3 Series +7.5cc  Dome Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.04 inch bore
Load image into Gallery viewer, 3-3275-4040-Boss 331 Stroker-Small Block Ford 289 - 302 FX3 Series +7.5cc  Dome Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.04 inch bore
Load image into Gallery viewer, 3-3275-4040-Boss 331 Stroker-Small Block Ford 289 - 302 FX3 Series +7.5cc  Dome Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.04 inch bore

SKU: 3-3275-4040

3-3275-4040-Boss 331 Stroker-Small Block Ford 289 - 302 FX3 Series +7.5cc Dome Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.04 inch bore

Regular price $939.95
Sale price $939.95 Regular price
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Ships in 1 - 8 days

Made in the USA

Made in the USA

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This is a pre order item. We will ship it when it comes in stock.

Boss 331 Stroker Small Block Ford 289 - 302 FX Comp Height: 1.165 +7.5cc Dome Top PIN: .927 Ring Groove: 1.2/1.2/3MM Stroke: 3.25 ROD: 5.4 Forged and Machined in Saint Charles Illinois USA! Boost and NOS Ready! (Moderate to Extreme Levels) Comp Ratio: 58cc-12.58, 64cc-11.51, 70cc-10.62


Engine Brand: Ford

Engine Family: Small Block Ford 289 - 302

Engine Size: Boss 331 Stroker

With/Without Rings: Without Rings

Cylinder Bore Size: 4.040 in - 102.54 mm

Ring Width: 1.2/1.2/3MM

Compression Height: 1.165

Pin Diameter: .927

Connecting Rod Length: 5.400 in

Crankshaft Stroke: 3.250 in

Piston Series: 3 - FX Series

Alloy: Forged 2619

Cylinder Head: 351 Cleveland \ Boss Open & Closed Chamber

TDC Assembly Height: 8.190000000000001

Piston Top Aprox. Comp. Ratio:

+7.5cc Dome Top 351 Cleveland \ Boss Open & Closed Chamber
ChamberComp Ratio
58cc12.58 to 1
64cc11.51 to 1
70cc10.62 to 1

Download Piston Instructions

Piston Specs

Engine Brand: Ford

Engine Family: Small Block Ford 289 - 302

Engine Size: Boss 331 Stroker

With/Without Rings: Without Rings

Cylinder Bore Size: 4.040 in - 102.54 mm

Ring Width: 1.2/1.2/3MM

Compression Height: 1.165

Pin Diameter: .927

Connecting Rod Length: 5.400 in

Crankshaft Stroke: 3.250 in

Piston Series: 3 - FX Series

Alloy: Forged 2619

Cylinder Head: 351 Cleveland \ Boss Open & Closed Chamber

TDC Assembly Height: 8.190000000000001

Piston Top Aprox. Comp. Ratio:

+7.5cc Dome Top 351 Cleveland \ Boss Open & Closed Chamber
ChamberComp Ratio
58cc12.58 to 1
64cc11.51 to 1
70cc10.62 to 1

Download Piston Instructions

Engine Power TV

The DSS FX, X-Groove Feature