Chevrolet 400, 23˚ heads, Heavy Duty flat top

Application: 

 Recommended for applications using nitrous (up to 250HP shot) / boost (up to 8LBS). Image is a representation of this item. Actual item may vary.

Includes: 

Complete set of pistons, locks, pins & oil rail spacers (as required). 

Specifications:

Piston top type: flat top
Bore: 4.125" to 4.165" 
Stroke: 3.480" to 3.875" 
Rod length: 5.565" to 6.000"
Compression height: 1.063" to 1.568" 
Compression ratio (58): 11.30 (4.125) to 12.10 (4.165)
Compression ratio (64): 10.50 (4.125) to 11.30 (4.165)
Compression ratio (76): 9.30 (4.125) to 10.00 (4.165)
Dome volume: -4.00
Gram weight: 437
Rings: 1/16 1/16 3/16
Ring Set: N/A
Rings Included: No
Oil Rail Spacer: ORS-412
Pin Type: 5115 Straight Wall
Pin Diameter: .927
Pin Length: 2.500
Pin Wall: .150
Pin Weight: 118 Grams
Block Height: 9.025
Note: (1) Piston Rings Sold Separately. (2) Compression Ratio based on .050 piston to head clearance (deck & gasket combined).