Order Status & Returns
Gift Cards
Help Center
1-800-345-4545
Vehicle Info NeededUNITED ENGINE MACHINEPART NUMBER: 648-KB422.040
Pontiac 400ci Hypereutectic Pistons Solid Dome 10cc +040
$50216
Ships on 09/08/2026
Lowest Price GuaranteePontiac 400ciSolid Dome
- Pontiac 400ci Hypereutectic Pistons
- Solid Dome 10cc
- 4.160" Bore (+.040'')
- Use w/6.630'' Connecting Rod & 3.750'' Crank Stroke
- Comp. Ratio: 9.4:1/100cc
- 8/pkg
Note: Designed to work with 1967 and later 14-degree heads. Piston is .025" below a 10.250" deck. Check small end of rod to piston before assembly / .045" clearance per side minimum.
Technical Specs: - Alloy: Hypereutectic 390 Alloy
- Bore: 4.160'
- Crankshaft Stroke: 3.750'
- Connecting Rod Length: 6.630'
- Deck Height: 10.250'
- Compression Height: 1.710'
- Pin Size: 0.980' x 3.000'
- Pin Location: Centered
- Solid Dome Top: 10.0cc 2 Valve Reliefs
- Intake Valve Relief: 0.239" Depth / 2.140" Diameter
- Exhaust Valve Relief: 0.239" Depth / 2.140" Diameter
- Top Landing Height: 0.300'
- Ring Grooves: 5/64' Top; 5/64' Middle; 3/16' Bottom
- Gram Weight: 582/163
- Compression Ratio: 9.4:1 w/100cc Combustion Chamber Heads
Part TypePiston
BrandUNITED ENGINE MACHINE
Package Height3.8
Package Width9.2
Package Length13.8
Weight7.54 PG
Part CategoryPerformance Parts
Part FitmentSemi Universal
Vendor Part NumberKB422.040
Package Qty1
Package TypeEA
No Questions
No Reviews
Items You Need
![Engine Assembly Lube [4 oz. Bottle]](https://www.jegs.com/images/mini_200/500/555/555-28000.jpg)
JEGS
Piston Ring Pliers Installs and Removes Rings without Breakage
Part Number : 555-80845
$647$6.99
You Save$0.52
UNITED ENGINE MACHINE
Ring Set 4.120 bore .040 oversize 2-5/64 1-3/16 moly ring set qty 8 cyl set
Part Number : 648-4120AM8.040
$10395
JEGS
Part Number : 555-80845
$647$6.99
You Save$0.52
UNITED ENGINE MACHINE
Part Number : 648-4120AM8.040
$10395
Some parts are not legal for use in California or other states with similar laws / regulations
