Here at JH Mountain Auto Services when we partnered with JASPER® Engines originally it was because of their dedication to quality and their reputation in the market as being the nation's largest and oldest remanufacturer! As we have grown in that relationship, we continue to find more of our values and goals are the same for the customers we serve here in Silverthorne which is unique in a nationwide company that has been around since 1942. They provide a very high-quality product for the automotive - truck - marine customers and just like us have a passion for performance and classic authentic engines.
JASPER® PERFORMANCE CRATE ENGINES: STOCK, CLASS I, STOCK PERFORMANCE & CLASS II
JASPER® offers 4 levels of engine performance models for our Silverthorne drivers to choose from with the complete information listed below for your convenience.
JASPER® PERFORMANCE STOCK ENGINES
"Stock" is the general engine offered in a production vehicle and it receives the JASPER® Engines standard remanufacturing process which includes torque plate honing, three-angle valve seat machining precision crankshaft machining, oil chamfering, and polishing plus computer-assisted live-run testing.
JASPER® PERFORMANCE CLASS I ENGINES
The "Class I" engine receives a mild camshaft upgrade providing about 10% more horsepower and torque over the standard stock engine. The Class I version of the JASPER PERFORMANCE Engine is for the individual who wants more performance than stock but nothing too radical in camshaft or engine design. The Class I engine does not use a radical camshaft. The camshaft included with the engine is a torque-economy type that provides better everyday performance than stock without sacrificing smooth idle and driveability. This type of cam is also compatible with today’s computer-controlled engines.
JASPER® PERFORMANCE STOCK PERFORMANCE ENGINES
The JASPER® "Stock Performance Engine" has a more aggressive camshaft profile compared to the Class I engine and also receives 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. This engine is ideal for street rods, Corvettes, Camaros, and other performance vehicles. Priced very reasonably, this engine includes the block, Vortec-style heads, oil pump, and timing cover.
JASPER® PERFORMANCE CLASS II ENGINES
Our serious performance-minded drivers wanting power for their street rods, muscle cars, racing, or a project vehicle always choose the JASPER® Class II Performance Engine which receives additional machining to castings such as align boring, block deck surface machining, 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.
JASPER® AUTHENTIC CUSTOM ENGINE & DRIVETRAIN DIVISION
Here at JH Mountain Auto Services in Silverthorne, our classic car and truck owners take pride and satisfaction in owning their classic vehicle and it is all about being authentic. The JASPER® Authentic Custom Drivetrains Division shares the same feelings in the quality of their work, making sure that you are satisfied with every detail of this exciting experience which is why we recommend the JASPER® solution to our classic car enthusiasts.
They rebuild your authentic gas engine include a numbers-matching build, original paint, testing, and, upon request and for an additional charge, valuable documentation of the remanufacturing process. With experience dating back to 1942, the latest technology, and their passion for perfection, you can expect only the best from the JASPER® Authentic Custom Drivetrain team.
Our Silverthorne drivers who have requested a documentation package, have received bills of material, specifications, dynamometer reports (if appropriate and when they purchased the Dyno Package) plus detailed in-process information, including photos. Anything you would like to know about your engine as it goes through the extensive and precise process is provided and information available 24/7 via a web page that is uniquely yours. The documentation and photos, specific to your engine build, are also provided in a hard copy after the final bolt is tightened. That is an authentic custom building in our books here at JH Mountain Auto Services!
If you have any questions about performance engines or authentic custom engines, talk to our team of automotive technicians here at JH Mountain Auto Services in Silverthorne, CO.
Class 1 Engines for mild camshaft profiles and 10% more horsepower and torque than a stock engine.
Stock Performance Aggressive camshaft profile in comparison to Class 1 Engine with upgraded aftermarket cylinder heads.
Class II Engines Serious horsepower for specific applications with additional machining of castings and performance valves. Matched high-tension valve springs and high-performance fasteners.
JASPER® Performance engines offer a wide range of proven products and performance levels to meet your individual needs
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