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KB Series Hypereutectic 390 Alloy with 16% Silicon Pistons
This is an all out Hypereutectic T-6 heat treat piston with machining features of their next generation forgings. There are significant advantages with hypereutectic pistons in compression restircted classes. The lower conductivity of the alloy and reflective piston top lowers oil temperatures, reduces combustion heat and pressure lost. Tight suggested clearances keep things quiet and reduces oil comsumption. Lockrings and pins included at no extra charge. Sets of 8.
High Performance - Marine - Drag - Circle Track - Towing
CNC machined pin bores produce straight and accurately sized bores
Diamond Finished Skirts
Machined in Oil Returns
Accumulator Grove aids with compression ring seal
Fully Machined head and valve reliefs
Mini Grooves to reduce scuffing if overheated
Triple Spiral Lock Rings
Part Type: Pistons
Model: Hypereutectic 390 Alloy with 16% Silicon Pistons
Application: Chevrolet Big Block V8 (Closed Chamber Head)
Piston Style: Solid Dome with 1 Valve Relief
Cylinder Bore: 4.290"
Compression Distance: 1.520"
Crankshaft Stroke/Rod Length: 4.250" with 6.535" Connecting Rod (491ci)
Deck Height: 10.200"
Dome Volume: -17cc
Compression Ratio 4.250" Stroke w/96.5cc Heads: 12.3
Compression Ratio 4.250" Stroke w/108cc Heads: 11.0
Compression Ratio 4.250" Stroke w/119cc Heads: 10.0
Piston Material: Hypereutectic 390 Alloy
Intake Valve Relief Depth: .266"
Intake Valve Relief Diameter: 2.310"
Exhaust Valve Relief Depth: N/A
Exhaust Valve Relief Diameter: N/A
Accumulator Groves: Yes
Forced Pin Oilers: No
Gas Ports: No
Skirt Coating: No
Lock Removal Indents: No
Average Piston Weight: 652
Wrist Pin Style: Press-Fit or Floating
Wrist Pins Included: Yes
Wrist Pin Size: .990" x 3.000"
Average Wrist Pin Weight: 158
Pin Lock Included: Triple Spiral
Ring Grove Sizes: 1/16", 1/16", 3/16"
Piston Rings Included: No
Manufacturer: United Engine and Machine Company
Manufacturer's Part Number: KB397.040
Weight: 15.5 lbs.
Warranty: Sold without warranty or guarantee of any kind
Quantity: Sold as Sets of 8
Note: Centered Pin. Closed chamber heads.
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