Chevrolet big-block, low dome open chamber moderate compression

Application: 

Recommended for applications using nitrous (400+HP shot) / not recommended for turbo applications.

Includes:

Complete set of pistons, locks, & pins.

Specifications:

Piston top type: dome top.
Bore: 4.280" to 4.530".
Stroke: 3.760" to 4.250".
Rod length: 6.135" & 6.385".
Compression height: 1.275 to 1.768"".
Compression ratio (109.00): 11.40.
Compression ratio (118.00): 10.50.
Compression ratio (124.00): 10.00.
Dome volume: 15.30 to 51.00.
Dome height: .235".
Gram weight: 587 to 725.
Rings: 1/16", 1/16", 3/16".
Ring set: CR9190.
Rings included: no.
Oil rail spacer: ORS-425.
Pin type: 5115 straight wall.
Pin diameter: .990".
Pin length: 2.930".
Pin wall: .150".
Pin weight: 146 grams.
Pin buttons: N/A.
Block height: 9.800".
Top land: .360".
Second land: .185".
Oil land: .085".
Deck thickness: .200".
Intake cutter: 2.400".
Exhaust cutter: slant.
Intake depth: .320".
Exhaust depth: .120" up.
Note: (1) heavy NOS forging design (2) compression ratio based on .050" piston to head clearance (deck & gasket combined).