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Vehicle Info NeededUNITED ENGINE MACHINEPART NUMBER: 648-KB100KTD.040
Chevy 383 ci. Hypereutectic Flat Top Piston Set w/Rings for 4.040 in. Bore, 5.7 in. Rod
$55502
Ships on 09/14/2026
Lowest Price GuaranteeChevy 383ciFlat Top Pistons Use w/5.700'' Connecting Rods Use with Chevy 350ci Block and 400ci Crankshaft
Chevy 383ci Hypereutectic Pistons and RingsFlat Top w/2 Valve Reliefs 4.040 in. Bore (+.040 in.) Use w/5.700 in. Rod & 3.750 in. Stroke Crank Includes: File Fit Plasma Moly Coated Ring Set 1/16, 1/16, 3/16 in. Ring Grooves Set of 8
Chevy 383 ci. Hypereutectic Flat Top Piston Set w/Rings for 4.040 in. Bore, 5.7 in. Rod:
- Alloy: Hypereutectic 390
- Bore: 4.040 in.
- Crankshaft Stroke: 3.750 in.
- Connecting Rod Length: 5.700 in.
- Deck Height: 9.025 in.
- Compression Height: 1.433 in.
- Pin Size: 0.9272 in.
- Pin Location: Centered
- Flat Top: -7cc 2 Symmetrical Valve Reliefs
- Intake Valve Relief: 0.280 in. Depth / 2.168 in. Diameter
- Exhaust Valve Relief: 0.280 in. Depth / 2.168 in. Diameter
- Top Landing Height: 0.275 in.
- Ring Grooves: 1/16 in. Top; 1/16 in. Middle; 3/16 in.Bottom
- Gram Weight: 500/145
- Compression Ratio: 11.9:1 w/58cc Heads; 11.3:1 w/62cc Heads; 11.1:1 w/64cc; 9.7:1 w/76cc Heads
- Use with 350ci block and 400ci crankshaft. This is a stroked 350ci chevy combination
- May require block clearancing
100% CNC Machined Pistons
New high silicon alloys and diamond tooling have give Keith Black designers the material and equipment for performance breakthroughs in engine design. KB piston are 100% CNC machined and T-6 heat treated from 16%-18% silcon Hypereutectic alloy. Features include drilled oil returns and pin oil supply, .072'' spiral wound retaining ring, 100% diamond turned, compensated high strength ring lands, high top ring location, 360° pressure pin oiling, diamond honed pin hole and lightweight rigid rib skirt design.
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Features:
- 390 Hypereutectic alloy with 16% Silicon
- Fully machined crowns and valve reliefs
- Drilled oil drain backs
- Full floating wrist pins
- Triple wound spiral locks
- Reflective alloy allows 2% power increase
- Quench dome technology minimizes deterioration
- Zero deck quench designs
- Sold in Sets (except when noted as 1 piston per package)
Click here for reference guide to piston top designs
Part TypePiston
Product LineUEM Pistons KB Signature Series Hypereutectic Small Block Chevy Pistons
BrandUNITED ENGINE MACHINE
Package Height3.8
Package Width9.2
Package Length18.1
Weight12.51 PG
Part CategoryPerformance Parts
Piston Ring Thickness (In.)1/16 x 1/16 x 3/16
File FitYes
Wrist Pin StylePress-fit or floating
QuantitySet of 8
Piston StyleFlat top, with two valve reliefs
Piston Head Volume (Cc)7
GaplessNo
Compression Distance1.433 in (36.398 mm)
Top Ring Facing MaterialPlasma-moly
Piston MaterialHypereutectic
Pin Diameter0.927 in (23.5 mm)
Part FitmentSemi Universal
Vendor Part NumberKB100KTD.040
Package Qty1
Package TypeEA
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