KB Hyper Performance Piston Kit, KB257KTM.060

1 Set KB257.060/1 Set 4250AM8.060

Centered pin. OC = open chamber head.

Sold As: Kit with Rings

Engine Manufacturer: Chevrolet

Engine Family: Chevrolet BB V8 Mark IV

Engine Displacement (Liters): 7.4

Engine Displacement (cubic inches): 454

Bore Size (in): 4.25

Bore Size (mm): 108

Piston Head Type: Dome

Crown (cc): -26cc

Compression Ratio: 119-10.2

Top Land: 0.308

Pin Type: Press or Floating

Make for Engine Family: General Motors

Oversizes: STD, .030, .040, .060, .070, .100

Crown Type: .250" OC HOLLOW DOME 1V

Pin Diameter (in): 0.99

Pin Configuration: Centered

Year To: 2000

Bore Diameter IN: 4.25

Piston Material: Cast 390 Hypereutectic Alloy

Compression Height IN: 1.645

Bore Diameter MM: 108

Compression Height MM: 41.7

Rod (mm): 155.829

Lock: PRG110-3

Stroke (in): 4

Oversize: .060"

Year From: 1970

Rod (in): 6.135

Pin Number: 0990x300K

OE Deck Height: 9.8

Year Range: 1970-2000

Alloy: 390

Stroke (mm): 101.6

Ring Pack: 5/64, 5/64, 3/16

Pin Diameter (mm): 25.1

Grade Type: Performance

Oversized: Yes

Base Number: KB257

Intake Valve Depth/Diameter: .266/2.310