CALL 800-827-7455 OR LOGIN TO YOUR ACCOUNT

For the best possible cylinder wall geometry, JASPER torque-plate hones all Chrysler 5.7L Hemi blocks to ensure the bore is consistent from top to bottom.

JASPER upgrades the Chrysler 5.7L Hemi with improved parts such as nitrided valves, JASPER designed pistons with more robust piston rings and updated press-fit valve seats for early-style heads.

JASPER Engines undergo Live-Run Testing using state-of-the-art Data Acquisition to check compression, vacuum, and oil pressure for your assurance of reliability.

BRINGING MORE VALUE TO YOU AND YOUR CUSTOMERS

100% installation of the latest design roller bearing assemblies for maximum lifter durability and longevity.

• Early-style heads receive NEW updated valve seats which are press-fit to tighter specifications to ensure seat retention.

• Block and head surface finishes are machined to a 50-150 Rz finish to prevent external leaks.

• MLS (Multi-Layered Steel) head gaskets ensure superior protection against gasket leakage. Our MLS gasket is also more robust to maintain the correct compression ratio.

• JASPER includes a stronger, more robust piston ring pack for greater durability, better heat resistance, and improved oil control as compared to OE.

• Torque-plate honing, provides cylinder wall geometry that matches the cylinder head as a complete running assembly, for improved ring sealing.

• Re-engineered JASPER piston design features:

Full-floating pin to reduce pin bore scuffing.
Twice the piston skirt (thrust area) for improved durability and reduced piston scuffing tendency.
Graphite coated piston skirts help prevent piston scuffing and dry start-up.
Additional center skirt drain backs provide 3X more oil return.

• Upgraded rear cam bearing, with larger oil hole for improved oiling.

• Nitrided valve upgrade improves heat resistance and reduces valve guide wear.

• To prevent bearing damage, crankshafts are machined and micro-polished to JASPER’s exact and proven specifications for improved, more precise oil tolerances and longer bearing life.

• High-temperature fluoroelastomer polymer (FPM) rear seal is installed to prevent oil leaks.

• Live-Run Testing, with Data Acquisition and other assessments for your assurance of reliability, includes:

Compression
Vacuum
Oil Pressure

3 Year / 100,000 Mile Nationwide Transferable Warranty

Full warranty disclosure available at www.jasperengines.com or
upon request. Specifications subject to change without notice.

Product Videos

Jasper Engines & Transmissions - Chrysler 5.7L HEMI Piston Design Update

Jasper Engines & Transmissions - Chrysler 5.7L HEMI Head Gasket Update

Jasper Engines & Transmissions - Chrysler 5.7L Hemi Valve Seat Update

Chrysler 5.7L Hemi Engines

Value-Added Quality Improvements from JASPER

Issue / Concern:

JASPER Solution:

Lifter/Roller Failure

100% installation of NEW (15-needle) roller bearing assemblies. The pin is improved with a through-hardening process followed by a case-hardening procedure for maximum lifer durability and longevity.

Dropped Valve Seats

Early-style heads receive tighter press-fit seats to ensure seat retention.

Head Gasket Leaks

Surface finish on heads and blocks are machined to a 50-150 Rz finish to protect against external leaks.
Installation of MLS (Multi-Layered Steel) head gaskets with a larger firing ring bore to improve sealing and more robust in design to maintain OE compression ratio.

Oil Consumption

JASPER includes a stronger, more robust piston ring pack for greater durability, better heat resistance, and improved oil control as compared to OE.
Torque-plate honed to simulate cylinder bore distortion, which occurs after block/head assembly, ensuring correct bore roundness.
Additional center skirt drain backs provide 3X more oil return.

Dry Start-up and Piston Scuffing

Re-engineered JASPER piston design features:
- Full-floating pin to reduce pin bore scuffing.
- Twice the piston skirt (thrust area) for improved durability and reduced scuffing tendency.
- Graphite coated piston skirts help prevent piston scuffing and dry start-up.

Valve Guide Wear

100% installation of NEW nitrided engine valves for improved heat resistance and reduced valve guide wear.

Low Oil Pressure/Knocking

Micro-polished crankshafts are machined to exact tolerances for improved, more precise oil tolerances and longer bearing life.

Oil Leaks and Runability Issues

High-temperature fluoroelastomer polymer (FPM) rear seal is installed to prevent oil leaks
Every engine is live-run tested to verify proper compression, vacuum, and oil pressure. JASPER also performs a black light leak test to ensure the unit is leak-free.

MDS Delete

JASPER offers MDS Delete as an option for select Ram 1500 5.7L Hemi engines.
MDS Delete engine will have a Non-MDS Cam, 16 standard lifters, and MDS solenoid plugs installed.
MDS Delete option is 49-state compliant. Not legal for use or sale in California.
JASPER includes a Diablo programmer with all MDS Delete engines.
Diablo programmer is 50-state legal and available for purchase with standard replacement engines. (CARB E.O. D-770).