4.000 +.020", D-Cup 28cc w/2V,Top Ring:1/16", 2nd Ring: 1/16", Oil Ring: 3/16", Comp Ratios: 9.3w/58cc,9.0/62cc,8.8w/64cc,8.0w/76cc,Gram weight 549/145, INT-Valve Depth/DIA .280-2.168", EX-Relief Depth/Dia .280-2.168"
KB Series Hypereutectic 390 Alloy with 16% Silicon is a High Performance Piston for Marine, Drag, Circle Track and Towng. Fully machined head and valve reliefs. Mini Grooves to reduce scuffing if overheated. Accumulator Grove aids with compression ring seal. Triple Spiral Lock Rings. Machined in Oil Returns. CNC machined pin bores produce straight and accurately sized bores. Diamond finished skirts.
  • Bore: 4.000 +.020"
  • Stroke: 3.750
  • Comp HT: 1.433
  • O.E Deck HT: 9.025
  • Lock Ring:PRJ100-3
  • D-Cup 28cc w/2 Valve Reliefs
  • Centered Pin. Made with Chevrolet 350SB
  • Pin Size: 0.9272 / Pin# 0927X300
  • Ring Set: 4000BD8 or 4000BM8
Attributes
Alloy 390
Base Number KB121
Bore (in) 4
Bore (mm) 101.6
Compression Ratio 58-9.3, 62-9.0, 64-8.8, 76-8.0
Country of Origin (Primary) MX
Crown (cc) +28cc
Crown Type D-CUP 2V
Eng. Disp Liters 6.3
Eng. Disp. In. 383
Engine Family Chevrolet SB V8 Gen I
Engine Manufacturer Chevrolet
Exhaust Valve Depth/diameter .280/2.168
GTIN 00800745043955
Hazardous Material Code N
Intake Valve Depth/diameter .280/2.168
Life Cycle Status Code Available to Order
Lock PRJ100-3
Make For Engine Family General Motors
Oe Deck Height 9.025
Oversize .020
Oversizes STD .020 .030 .040 .060
Pin Configuration Centered
Pin Diameter (in) .927
Pin Diameter (mm) 23.5
Pin Number 0927x300K
Pin Type Press or Floating
Ring Pack 1/16, 1/16, 3/16
Rod (in) 5.7
Rod (mm) 144.78
Sold as PISTON SET
Stroke (in) 3.75
Stroke (mm) 95.3
Top Land .275
Year Range -

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NEW! KB Hypereutectic Pistons KB121.020 KB Hyper Piston - Chevy 383, Rod 5.700, D-Cup +28cc 2V

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Tags: Chevy Small Block Gen I