1-3270-4125-Boss 331 Stroker-Small Block Ford 289 - 302 FX1 Series -3cc Flat Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.125 inch bore
1-3270-4125-Boss 331 Stroker-Small Block Ford 289 - 302 FX1 Series -3cc Flat Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.125 inch bore
1-3270-4125-Boss 331 Stroker-Small Block Ford 289 - 302 FX1 Series -3cc Flat Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.125 inch bore
1-3270-4125-Boss 331 Stroker-Small Block Ford 289 - 302 FX1 Series -3cc Flat Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.125 inch bore
Load image into Gallery viewer, 1-3270-4125-Boss 331 Stroker-Small Block Ford 289 - 302 FX1 Series -3cc Flat Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.125 inch bore
Load image into Gallery viewer, 1-3270-4125-Boss 331 Stroker-Small Block Ford 289 - 302 FX1 Series -3cc Flat Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.125 inch bore
Load image into Gallery viewer, 1-3270-4125-Boss 331 Stroker-Small Block Ford 289 - 302 FX1 Series -3cc Flat Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.125 inch bore
Load image into Gallery viewer, 1-3270-4125-Boss 331 Stroker-Small Block Ford 289 - 302 FX1 Series -3cc Flat Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.125 inch bore

SKU: 1-3270-4125

1-3270-4125-Boss 331 Stroker-Small Block Ford 289 - 302 FX1 Series -3cc Flat Top 351 Cleveland \ Boss Open & Closed Chamber-Forged-Piston-Set- 4.125 inch bore

$719.95
$719.95
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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 -3cc Flat 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 High Levels) Comp Ratio: 58cc-11.19, 64cc-10.38, 70cc-9.69


Engine Brand: Ford

Engine Family: Small Block Ford 289 - 302

Engine Size: Boss 331 Stroker

With/Without Rings: Without Rings

Cylinder Bore Size: 4.125 in - 104.69 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: 1 - FX Series

Alloy: Forged 4032

Cylinder Head: 351 Cleveland \ Boss Open & Closed Chamber

TDC Assembly Height: 8.190000000000001

Piston Top Aprox. Comp. Ratio:

-3cc Flat Top 351 Cleveland \ Boss Open & Closed Chamber
ChamberComp Ratio
58cc11.19 to 1
64cc10.38 to 1
70cc9.69 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: 4.125 in - 104.69 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: 1 - FX Series

Alloy: Forged 4032

Cylinder Head: 351 Cleveland \ Boss Open & Closed Chamber

TDC Assembly Height: 8.190000000000001

Piston Top Aprox. Comp. Ratio:

-3cc Flat Top 351 Cleveland \ Boss Open & Closed Chamber
ChamberComp Ratio
58cc11.19 to 1
64cc10.38 to 1
70cc9.69 to 1

Download Piston Instructions

Engine Power TV

The DSS FX, X-Groove Feature