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JE Ultra Series Chevrolet LS Gen III/IV Piston Kit – 4.005 in. Bore – 1.304 in. CH, -6.20 CC

$1,338.19

SKU: 361723

JE Ultra, Chevrolet, LS Gen III/IV, 4.005 in. Bore, 1.304 CD, Flat Top, 8 Cyl. Piston Kit

Ultra Series forged pistons from JE are the industry’s strongest, most fully featured pistons available off the shelf. Offered for a wide range of domestic applications from LS to Big Block and HEMI to Ford Modular, Ultra Series pistons feature JE’s proprietary Aligned Grain Flow forging technology providing next-level tensile strength ideal for the extreme cylinder pressures of power adder engine builds. Equipped with custom level features including thermal barrier crown coating, skirt coating, gas ports, and more, Ultra Series are the ideal pistons for your boost-heavy or nitrous-huffing V8 engine build. As with all JE Pistons products, Ultra Series pistons are made 100% in the USA.

  • Designed for Power: Every feature on Ultra Series Pistons are optimized to perform high-horsepower racing engines
  • Aligned Grain Flow Technology: Exclusively available on JE Ultra Series, this proprietary, in-house forging process maximizes tensile strength to withstand the stresses of high-performance engine environments
  • Skirt Coating: Reduces friction and wear on piston skirts and cylinder walls while simultaneously reducing operating noise, especially on cold start
  • Thermal Barrier Crown Coating: This ceramic-based coating reflects heat into the combustion chamber, therefore reducing piston crown temperatures and improving exhaust gas scavenging
  • High-Strength Wrist Pins: Premium thick-wall wrist pins are manufactured by Trend Performance in the USA and are designed for the demands of high-performance/power-adder builds
  • Lateral Gas Ports: Help maintain power-producing ring seal at the top compression ring, even in high RPM and high boost situations
  • Optimized Pin Oiling: Enhanced pin oiling features keep pin, pin bores, and small-end lubricated for reduced heat, friction, and wear
  • Made 100% in the USA

GTIN: 00193564038692

Weight 13.000 lbs
Dimensions 26.000 × 12.000 × 6.000 in
Cylinder Head

LS 12 DEG/15 DEG COMBO VR

Bore Diameter

4.005 IN

Piston Head Type

Flat

Compression Height

1.304 IN

Piston Volume

-6.20 CC

Piston Material

2618

Forging Type

FSR

Ring Set Included

No

Top Compression Ring Thickness

0.0475 IN

Second Compression Ring Thickness

0.0600 IN

Oil Ring Thickness

0.1175 IN

Wrist Pin Included

Yes

Wrist Pin Part Number

927-2250-15-51C

Wrist Pin Outer Diameter

0.927 IN

Wrist Pin Length

2.250 IN

Wrist Pin Wall Thickness

0.200 IN

Wrist Pin Retainer Included

Yes

Ring Set Thickness

1.20 MM x 1.50 MM x 3.00 MM

Instructions: Enter a value in the un-shaded boxes below as they pertain to your engine.
Note: For pistons BELOW the block @ TDC – value in box must be a NEGATIVE number (-0.000)
Note: For pistons ABOVE the block @ TDC – value in box must be a POSITIVE number (0.000)
Note: For a DISH piston – value in box must be a NEGATIVE number (-0.0)
Note: For a DOME piston – value in box must be a POSITIVE number (0.0)
Note: Manipulate the DOME/DISH & PISTON to DECK volumes to get the ratio you want.
Enter the number of cylinders of your engine
Bore
Finished bore of your engine
Stroke
Stroke of your engines crankshaft
Rod Length
Ctr. to Ctr. length of your connecting rods
Gasket Bore
Head Gasket bore diameter
Comp. Gasket
Compressed Head Gasket thickness
Block Deck Height
Center of main bearing bore to top of block
Top Ring Down
Top of 1st ring to top of pistons(FLAT)
Chamber Volume
Cylinder Head chamber volume in CC’s
Dome/Dish Volume
DOME (-) or DISH (+) vol. (theoretical) in CC’s
Piston to Deck
Top of BLOCK to top of piston (FLAT) @ TDC
Click “Calculate” for dimension results.
Total Volume
 
Cylinder Volume
Total cylinder volume in CC’s =
Clearance Volume
All effective vol. above block deck @ TDC in CC’s =
Gasket Volume
Volume of your head gasket in CC’s =
Top Ring Volume
Total volume above the top ring @ TDC in CC’s =
Deck Volume
Volume of area above the pistons @ TDC in CC’s =
Piston Top Land
Piston top land diameter for volume calculations =
1/2 Stroke
1/2 stroke of your engine’s crankshaft in inches =
Compression Ht.
Ctr. of piston pin to top of piston (FLAT) in inches =
Cubic Inches
Cubic inch displacement of your engine =
For the given dimensions, your compression ratio