Keith Black Hypereutectic pistons are T-6 heat treated and offer reduced scuffing and improved durability over stock replacement pistons. They also allow you to run tighter clearances because of reduced thermal expansion, which means more race winning power.

For Ford 3351W c.i. (4.00" bore x 3.50" stroke). Use piston ring Style A (5/64", 5/64", 3/16").

390 Hypereutectic alloy
Fully machined crowns and valve reliefs
Drilled oil drain backs
Full floating wrist pins
Triple wound spiral locks
Reflective alloy allows 2% power increase
Quench dome technology minimizes deterioration
Zero deck quench designs

Item Details

C/R 64cc: 10.3, C/R 69cc: 9.7
Bore and Stroke: 4.00" x 3.50"
Rod Length: 5.956" Ring Style: A

Charts

474-151 Instructions (PDF)

Ring Style Chart (GIF)

Specs

Pin Diameter: .912"

CA Prop 65

CARB warning

Specifications

KEY SPECS
MFG. Part #	Select Oversize to see
Brand	Keith Black
Piston Style	Flat Top w/ 2 valve reliefs
Piston Material	Hypereutectic Aluminum

GENERAL
Piston Diameter	Select Oversize to see
Stroke	3.500"
Connecting Rod Length	5.956"
Piston Weight	420 grams
Piston Ring Style	A
Wrist Pin Diameter	0.9120"
Wrist Pin Weight	145 grams
Compression 64cc =	10.3 : 1
GTIN Code	Select Oversize to see
Sold in Quantity	Set