Crate Engines

JASPER has four levels of engine performance for your project vehicle.

• Stock
• Class I
• Stock Performance Engine
• Class II

"Stock" is the general production engine offered in a production vehicle. Stock engines receive JASPER’s tried and true methods of remanufacturing, including torque plate honing, three-angle valve seat machining Precision crankshaft machining, oil chamfering and polishing and computer-assisted live-run testing.

The "Class I" engine is the same JASPER general production engine, but with a mild camshaft upgrade. Class I engines generally produce about 10% more horsepower and torque over the standard stock engine.

The next step up is JASPER’s "Stock Performance Engine." These engines utilize a more aggressive camshaft profile compared to the Class I engine. They also receive performance cylinder heads as an upgraded bolt-on part. With performance starting at 300 horsepower, and that fair idle lope street rod & muscle car guys love to hear, the stock performance engine is regarded as the most economical horsepower build.

Finally, the "Class II" engine is for the serious performance minded person who needs power for a specific application. These engines receive additional machining to castings such as align boring, square decking and balancing of the rotating assembly.

Special components like performance valves, high performance fasteners, a double roller timing set and high tension valve springs are selected and matched for most applications to obtain maximum performance.

Visit the Performance sections of our Video Library and our Literature Downloads for more information. The Performance section of our Literature Downloads page provides a number of specification sheets on the various builds we offer.