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Chevrolet Performance Engines  |  GM 350 Marine Engines  |  Vortec Engines TBI Engines  |  Panther Engine

Class II Version - Chevrolet 5.7 340 HP  |  Class II Version - Chevrolet 350 280 HP  |  Class II Version - Chevrolet 350 Marine 325 HP  |  Class II Version - Chevrolet 350 280 HP   |  Class II Version - Chevrolet 350 300 HP  |  Class II Version - Chevrolet 350 300 HP Vortex  |  Class II Version - Chevrolet 350 300 HP TBI   |  Class II Version - Chevrolet 350 325 HP  |  Class II Version - Chevrolet 350 350 HP  |  Class II Version Chevrolet 350 360 HP Panther  |  Class III Version - Chevrolet 350 400 HP

Class II Version - Chevrolet 350 JASPER PERFORMANCE ENGINE 280 hp (approx.) @ 4600 rpm • 340 ft. lbs. Torque @ 3800 rpm

Version Description: The Class II Performance engine is for the serious performance minded person who needs power for a specific application. These engines are built with heavy-duty performance in mind. Special components and procedures are selected and matched to obtain maximum performance for your application. Not intended for use on pollution-controlled motor vehicles. 280 hp (approx.) @ 4600 rpm • 340 ft. lbs. Torque @ 3800 rpm Version Applications: • Performance oriented cars and trucks • Street Rods and restored muscle cars • Vans and towing vehicles • Small/medium size engines requiring good low speed torque • O.E.M. replacement Part Specifications: • Approximate 8.75:1 compression ratio • High performance rod bolts and nuts • High rev lifters and performance valve springs with retainers • High volume oil pump • Double roller timing set • Flat top hypereutectic pistons and moly rings • Harmonic balancer • Screw in rocker studs • High performance stainless steel valves: 1.94 Intake; 1.5 Exhaust • Class II camshaft • High performance bearings • High performance head gaskets • Four bolt main block • New Dart Heads Machining Specifications: • Kolene Salt Bath cleaning • Three angle valve seat machining • Precise surface finish measuring • Square decking of block • Main saddle align honing • Electronically balanced engine assembly • Torque plate honing • Computerized boring • Precision crankshaft machining, oil hole chamfering and polishing • Live testing Camshaft Specifications: • Hydraulic Camshaft • .050 Duration: 204° Intake; 214° Exhaust • Advertised Duration: 270° Intake; 280° Exhaust • Cam Lift: .280 Intake; .295 Exhaust • Valve Lift: .420 Intake; .443 Exhaust • Lobe Center: 107° Intake; 117° Exhaust Camshaft Range Guide and Recommended Equipment: • Fair idle with lope • Operating range of 2000-4800 rpm • Good midrange torque and response: 2400-3200 rpm range • Good fuel economy with recommended equipment • Good highway towing with correct axle ratio • Mild bracket racing suitability • Stock automatic or manual transmission compatibility • Recommended 3.70:1 axle ratio • Stock or aftermarket 2 plane or torque type intake manifold recommended • Stock 2 or 4 barrel or low cfm aftermarket carburetor recommended; rejetting may be necessary The “350” JASPER PERFORMANCE Engine was tested with headers, Edelbrock Performer manifold and 600 Edelbrock carburetor.

Class II Version - Chevrolet 350 Marine Engine 325 hp @ 5400 rpm • 364 ft. lbs. Torque @ 3700 rpm

Description: The Class II Performance engine is for the serious performance minded person who needs power for a specific application. These engines are built with heavy-duty performance in mind. Special components and procedures are selected and matched to obtain maximum performance for your application. Not intended for use on pollution-controlled motor vehicles 325 hp (approx.) @ 5400 rpm • 364 ft. lbs. Torque @ 3700 rpm Version Applications: • Marine Performance • O.E.M. replacement Part Specifications: • Approximate 8.75:1 compression ratio • High performance rod bolts and nuts • High rev lifters and performance valve springs with retainers • High volume oil pump • Double roller timing set • Flat top hypereutectic pistons and moly rings • Harmonic balancer • Screw in rocker studs • High performance stainless steel valves: 1.94 Intake; 1.5 Exhaust • Class II camshaft • High performance bearings • High performance marine head gaskets • Four bolt main block • New Dart Heads Machining Specifications: • Kolene Salt Bath cleaning • Three angle valve seat machining • Precise surface finish measuring • Square decking of block • Main saddle align honing • Electronically balanced engine assembly • Torque plate honing • Computerized boring • Precision crankshaft machining, oil hole chamfering and polishing • Live testing Camshaft Specifications: • Hydraulic Camshaft • .050 Duration: 224° Intake; 224° Exhaust • Cam Lift: .300 Intake; .307 Exhaust • Valve Lift: .450 Intake; .460 Exhaust • Lobe Center: 114° Intake; 114° Exhaust The “350” JASPER PERFORMANCE Engine was tested with headers, Edelbrock Performer manifold and 600 Edelbrock Marine carburetor.

Jasper Performance Products Class II Version - Chevrolet 350 Engines 280 hp @ 4600 rpm • 340 ft. lbs. Torque @ 3800 rpm

Description: The Class II Performance engine is for the serious performance minded person who needs power for a specific application. These engines are built with heavy duty performance in mind. Special components and procedures are selected and matched to obtain maximum performance for your application. Not legal for sale or use in California or on pollution controlled motor vehicles. Specifications subject to change without notice. 280 hp (approx.) @ 4600 rpm • 340 ft. lbs. Torque @ 3800 rpm Version Applications: •Performance oriented cars and trucks •Street Rods and restored muscle cars •Vans and towing vehicles • Small/medium size engines requiring good low speed torque • O.E.M. replacement Part Specifications: • Approximate 8.75:1 compression ratio •High performance rod bolts and nuts • High rev lifters and performance valve springs with retainers • High volume oil pump • Double roller timing set • Flat top hypereutectic pistons and moly rings • Harmonic balancer • Screw in rocker studs •High performance stainless steel valves: 1.94 intake; 1.5 exhaust •Class II camshaft •High performance bearings •High performance head gaskets •Four bolt main block Machining Specifications: •Kolene Salt Bath cleaning • Three angle valve seat machining •Precise surface finish measuring • Square decking of block •Main saddle align honing • Electronically balanced engine assembly •Torque plate honing • Computerized boring •Precision crankshaft machining, oil hole chamfering and polishing •Live testing Camshaft Specifications: •Hydraulic Camshaft •.050 Duration: 204° Intake; 214° Exhaust •Advertised Duration: 270° Intake; 280° Exhaust • Cam Lift: .280 Intake; .295 Exhaust •Valve Lift: .420 Intake; .443 Exhaust •Lobe Center: 107° Intake; 117° Exhaust Camshaft Range Guide and Recommended Equipment: •Fair idle with lope • Operating range of 2000-4800 rpm • Good Midrange torque and response: 2400-3200 rpm range • Good fuel economy with recommended equipment • Good highway towing with correct axle ratio • Mild bracket racing suitability •Stock automatic or manual transmission compatibility • Recommended 3.70:1 axle ratio •Stock or aftermarket 2 plane or torque type intake manifold recommended •Stock 2 or 4 barrel or low cfm aftermarket carburetor recommended; rejetting may be necessary Engine Options Available: • Magnum roller tipped rockers • Aluminum roller rockers •Steel crank The “350” JASPER PERFORMANCE Engine was tested with headers, Edelbrock Performer manifold and 600 Edelbrock Carburetor. Readings taken at SAE standards. The manifold and carburetor are not included with the engine, but are available for an additional charge. Headers are not available.

Class II Version - Chevrolet 350 Engine 300 hp (approx.) @ 5000 rpm • 365 ft. lbs. Torque @ 4000 rpm Version

Description: The Class II Performance engine is for the serious performance minded person who needs power for a specific application. These engines are built with heavy-duty performance in mind. Special components and procedures are selected and matched to obtain maximum performance for your application. Not intended for use on pollution-controlled motor vehicles. 300 hp (approx.) @ 5000 rpm • 365 ft. lbs. Torque @ 4000 rpm Version Applications: • Performance oriented cars and trucks • Street Rods and restored muscle cars • Small/medium size engines requiring good low speed torque • O.E.M. replacement Part Specifications: • Approximate 8.75:1 compression ratio • High performance rod bolts and nuts • High rev lifters and performance valve springs with retainers • High volume oil pump • Double roller timing set • Flat top hypereutectic pistons and moly rings • Harmonic balancer • Screw in rocker studs • Dart S/S Heads • High performance stainless steel valves: 1.94 Intake; 1.5 Exhaust • Class II camshaft • High performance bearings • High performance head gaskets • Four bolt main block Machining Specifications: • Kolene Salt Bath cleaning • Three angle valve seat machining • Precise surface finish measuring • Square decking of block • Main saddle align honing • Electronically balanced engine assembly • Torque plate honing • Computerized boring • Precision crankshaft machining, oil hole chamfering and polishing • Live testing Camshaft Specifications: • Hydraulic Camshaft • .050 Duration: 214° Intake; 224° Exhaust • Advertised Duration: 280° Intake; 290° Exhaust • Cam Lift: .295 Intake; .310 Exhaust • Valve Lift: .443 Intake; .465 Exhaust • Lobe Center: 107° Intake; 117° Exhaust Camshaft Range Guide and Recommended Equipment: • Fair idle with lope • Operating range of 2000-4800 rpm • Good midrange torque and response: 2400-3200 rpm range • Good fuel economy with recommended equipment • Good highway towing with correct axle ratio • Mild bracket racing suitability • Stock automatic or manual transmission compatibility • Recommended 3.70:1 axle ratio • Stock or aftermarket 2 plane or torque type intake manifold recommended • Stock 2 or 4 barrel or low cfm aftermarket carburetor recommended; rejetting may be necessary The “350” JASPER PERFORMANCE Engine was tested with headers, Edelbrock Performer manifold and 600 cfm Edelbrock carburetor

Class II Version - Chevrolet 350 Engine 300 hp @ 5000 rpm • 365 ft. lbs. Torque @ 4000 rpm 1996–2003 Vortec Chevrolet and GMC C/K Series trucks Part Specifications

Version Description: The Class II Performance engine is for the serious performance minded person who needs power for a specific application. These engines are built with heavy-duty performance in mind. Special components and procedures are selected and matched to obtain maximum performance for your application. Not intended for use on pollution-controlled motor vehicles. Version Applications: • 1996–2003 Vortec Chevrolet and GMC C/K Series trucks Part Specifications: • Approximate 9.0:1 compression ratio • High performance rod bolts and nuts • High rev lifters and performance valve springs with retainers • High volume oil pump • Flat top hypereutectic pistons and moly rings • Harmonic balancer • Screw in rocker studs • High performance stainless steel valves: 1.94 Intake; 1.5 Exhaust • Class II camshaft • High performance bearings • High performance head gaskets • Four bolt main block Machining Specifications: • Kolene Salt Bath cleaning • Three angle valve seat machining • Precise surface finish measuring • Square decking of block • Main saddle align honing • Electronically balanced engine assembly • Torque plate honing • Computerized boring • Precision crankshaft machining, oil hole chamfering and polishing • Live testing Camshaft Specifications: • Hydraulic Roller Camshaft • .050 Duration: 210° Intake; 220° Exhaust • Advertised Duration: 264° Intake; 274° Exhaust • Valve Lift: .480 Intake; .480 Exhaust • Lobe Separation Angle: 112° Camshaft Range Guide and Recommended Equipment: • Pump gas compatible • Fair idle with lope • Operating range of 2000-4800 rpm • Good midrange torque and response: 2400-3200 rpm range • Good highway towing with correct axle ratio • Stock automatic or manual transmission compatibility • Recommended 3.70:1 axle ratio This engine is designed for improved performance over the standard O.E. engine. The existing intake manifold does not need to be changed. The customer must supply vehicle’s computer for reprogramming. Our sales representatives will need information about your current computer, tire size, gear ratio, type of trans-mission and any induction or exhaust modifications to your engine.

Class II Version - Chevrolet 350 Engine 300 hp @ 5000 rpm • 365 ft. lbs. Torque @ 4000 rpm 1987–1995 TBI Chevrolet and GMC C/K Series trucks Part Specifications

Description: The Class II Performance engine is for the serious performance minded person who needs power for a specific application. These engines are built with heavy-duty performance in mind. Special components and procedures are selected and matched to obtain maximum performance for your application. Not intended for use on pollution-controlled motor vehicles. 300 hp (estimated) @ 5000 rpm • 365 ft. lbs. Torque (estimated) @ 4000 rpm Version Applications: • 1987–1995 TBI Chevrolet and GMC C/K Series trucks Part Specifications: • Approximate 8.75:1 compression ratio • High performance rod bolts and nuts • High rev lifters and performance valve springs with retainers • High volume oil pump • Double roller timing set • Flat top hypereutectic pistons and moly rings • Harmonic balancer • Screw in rocker studs • Dart S/S Head • High performance stainless steel valves: 1.94 Intake; 1.5 Exhaust • Class II camshaft • High performance bearings • High performance head gaskets • Four bolt main block • Custom computer chip Machining Specifications: • Kolene Salt Bath cleaning • Three angle valve seat machining • Precise surface finish measuring • Square decking of block • Main saddle align honing • Electronically balanced engine assembly • Torque plate honing • Computerized boring • Precision crankshaft machining, oil hole chamfering and polishing • Live testing Camshaft Specifications: • Hydraulic Camshaft • .050 Duration: 214° Intake; 224° Exhaust • Advertised Duration: 280° Intake; 290° Exhaust • Cam Lift: .295 Intake; .310 Exhaust • Valve Lift: .443 Intake; .465 Exhaust • Lobe Center: 107° Intake; 117° Exhaust Camshaft Range Guide and Recommended Equipment: • Pump gas compatible • Fair idle with lope • Operating range of 2000-4800 rpm • Good midrange torque and response: 2400-3200 rpm range • Good highway towing with correct axle ratio • Stock automatic or manual transmission compatibility • Recommended 3.70:1 axle ratio This engine is designed for improved performance over the standard O.E. engine. The existing TBI intake manifold does not need to be changed. The custom computer chip must be purcased from Jasper. The chip is calibrated for the increased air and fuel demands of the performance engine. Our sales representatives will need information about your current computer, tire size, gear ratio, type of transmission and any induction or exhaust modifications to your engine. The manifold and TBI are not included with the engine. Headers are not available.

Class II Version - Chevrolet 350 325 [email protected] 5000 rpm • 383 ft. lbs. Torque @ 4000 rpm

Description: The Class II Performance engine is for the serious performance minded person who needs power for a specific application. These engines are built with heavy-duty performance in mind. Special components and procedures are selected and matched to obtain maximum performance for your application. Not intended for use on pollution-controlled motor vehicles. 325 hp (approx.) @ 5000 rpm • 383 ft. lbs. Torque @ 4000 rpm Version Applications: • Performance oriented cars and trucks • Street Rods and restored muscle cars • Small/medium size engines requiring good low speed torque • O.E.M. replacement Part Specifications: • Approximate 8.75:1 compression ratio • High performance rod bolts and nuts • High rev lifters and performance valve springs with retainers • High volume oil pump • Double roller timing set • Flat top hypereutectic pistons and moly rings • Harmonic balancer • Screw in rocker studs • Dart S/S Heads. • High performance stainless steel valves: 1.94 Intake; 1.5 Exhaust • Class II camshaft • High performance bearings • High performance head gaskets • Four bolt main block Machining Specifications: • Kolene Salt Bath cleaning • Three angle valve seat machining • Precise surface finish measuring • Square decking of block • Main saddle align honing • Electronically balanced engine assembly • Torque plate honing • Computerized boring • Precision crankshaft machining, oil hole chamfering and polishing • Live testing Camshaft Specifications: • Hydraulic Camshaft • .050 Duration: 224° Intake; 224° Exhaust • Cam Lift: .300 Intake; .307 Exhaust • Valve Lift: .450 Intake; .460 Exhaust • Lobe Center: 114° Intake; 114° Exhaust Camshaft Range Guide and Recommended Equipment: • Fair idle with lope • Operating range of 2000-4800 rpm • Good midrange torque and response: 2400-3200 rpm range • Mild bracket racing suitability • Stock automatic or manual transmission compatibility • Recommended 3.70:1 axle ratio • Stock or aftermarket 2 plane or torque type intake manifold recommended • Stock 2 or 4 barrel or low cfm aftermarket carburetor recommended; rejetting may be necessary The “350” JASPER PERFORMANCE Engine was tested with headers, Edelbrock Performer manifold and 600 Edelbrock carburetor.

Class II Version - Chevrolet 350 Version 350 hp @ 5500 rpm • 389 ft. lbs. Torque @ 4200 rpm

Description: The Class II Performance engine is for the serious performance minded person who needs power for a specific application. These engines are built with heavy-duty performance in mind. Special components and procedures are selected and matched to obtain maximum performance for your application. Not intended for use on pollution-controlled motor vehicles. 350 hp (approx.) @ 5500 rpm • 389 ft. lbs. Torque @ 4200 rpm Version Applications: • Performance oriented cars and trucks • Street Rods and restored muscle cars • Small/medium size engines requiring good low speed torque • O.E.M. replacement Part Specifications: • Approximate 9:1 compression ratio • High performance rod bolts and nuts • High rev lifters and performance valve springs with retainers • High volume oil pump • Double roller timing set • Flat top hypereutectic pistons and moly rings • Harmonic balancer • Screw in rocker studs • Dart S/S Heads • High performance stainless steel valves: 2.02 Intake; 1.60Exhaust • Class II camshaft • High performance bearings • High performance head gaskets • Four bolt main block Machining Specifications: • Kolene Salt Bath cleaning • Three angle valve seat machining • Precise surface finish measuring • Square decking of block • Main saddle align honing • Electronically balanced engine assembly • Torque plate honing • Computerized boring • Precision crankshaft machining, oil hole chamfering and polishing • Live testing Camshaft Specifications: • Hydraulic Camshaft • .050 Duration: 230° Intake; 230° Exhaust • Advertised Duration: 292° Intake; 292° Exhaust • Cam Lift: .292 Intake; .320 Exhaust • Valve Lift: .480 Intake; .480 Exhaust • Lobe Center: 107° Intake; 111° Exhaust Camshaft Range Guide and Recommended Equipment: • Fair idle with lope • Operating range of 2200-5500 rpm • Good midrange torque and response: 3000-4000 rpm range • Mild bracket racing suitability • Stock automatic or manual transmission compatibility • Recommended 3.70:1 axle ratio • Stock or aftermarket 2 plane or torque type intake manifold recommended • 4 barrel 750 cfm carburetor recommended; rejetting may be necessary • Must have a stall convertor The “350” JASPER PERFORMANCE Engine was tested with headers, Edelbrock Performer RPM manifold and 750 cfm Edelbrock carburetor.

Chevrolet 350 Panther Crate Engine 360 hp (approx.) @ 5400 rpm • 394 ft. lbs. Torque @ 4100 rpm

Description: The 350 Panther Crate Engine is for the serious performance minded person who needs power for a specific application. These engines are built with heavy duty performance in mind. Special components and procedures are selected and matched to obtain maximum performance for your application. Not intended for use on pollution-controlled motor vehicles. 360 hp (approx.) @ 5400 rpm • 394 ft. lbs. Torque @ 4100 rpm Version Applications: • Performance oriented cars and trucks • Street Rods and restored muscle cars • O.E.M. replacement Part Specifications: • Approximate 9:1 compression ratio • High performance rod bolts and nuts • High rev lifters and performance valve springs with retainers • High volume oil pump • Double roller timing set • Flat top hypereutectic pistons and moly rings • Harmonic balancer • Screw in rocker studs • Dart Performance Heads • High performance stainless steel valves: 2.02 intake; 1.60 exhaust • Class II camshaft • High performance bearings • High performance head gaskets • Four bolt main block Machining Specifications: • Kolene Salt Bath cleaning • Three angle valve seat machining • Precise surface finish measuring • Square decking of block • Main saddle align honing • Electronically balanced engine assembly • Torque plate honing • Computerized boring • Precision crankshaft machining, oil hole chamfering and polishing • Live testing Camshaft Specifications: • Hydraulic Roller Camshaft • .050 Duration: 230° Intake; 236° Exhaust • Valve Lift: .510 Intake; .520 Exhaust Camshaft Range Guide and Recommended Equipment: • Fair idle with lope • Operating range of 2200-5500 rpm • Good Midrange torque and response: 3000-4000 rpm range • Mild bracket racing suitability • Stock automatic or manual transmission compatibility • Recommended 3.70:1 axle ratio • Vacuum canister recommended • Edelbrock Performer RPM manifold • Tested with Holley 750 CFM carburetor • MSD HEI distributor • Water pump • Harmonic balancer • Flexplate • Oil Pan • Valve covers The “350” JASPER Panther Crate Engine was tested with headers, Edelbrock Performer RPM manifold and 750 Holley Carburetor.

Class III Version - Chevrolet 350 JASPER PERFORMANCE Engine 400 hp (approx.) @ 5600 rpm • 394 ft. lbs. Torque

Description: The Class III version of the JASPER PERFORMANCE Engine has been dubbed “The Unlimited” and is the choice for those serious about all-out performance. Applications for this version include bracket racers, off-road racing, street rods and hobby or street stock oval racers. Not intended for use on pollution-controlled motor vehicles. 400 hp (approx.) @ 5600 rpm • 394 ft. lbs. Torque Version Applications: •Performance oriented cars and trucks •Street Rods and restored muscle cars Part Specifications: •Forged steel crankshaft • Approximate 9.8:1 compression ratio • High performance rod bolts and nuts • High rev lifters and performance valve springs with retainers • High volume oil pump • Double roller timing set • Flat top hypereutectic pistons and moly rings • Harmonic balancer • Screw in rocker studs • High performance stainless steel valves: 2.02 Intake; 1.6 Exhaust •Class III camshaft • High performance bearings • High performance head gaskets •Four bolt main block • Dart Iron Eagle heads •Full roller rockers Machining Specifications: •Kolene Salt Bath cleaning • Three angle valve seat machining •Precise surface finish measuring • Square decking of block • Main saddle align honing • Electronically balanced engine assembly •Torque plate honing • Computerized boring •Precision crankshaft machining, oil hole chamfering and polishing • Live testing Camshaft Specifications: •Hydraulic Camshaft • .050 Duration: 234° Intake; 244° Exhaust •Advertised Duration: 300° Intake; 310° Exhaust • Cam Lift: .325 Intake; .340 Exhaust •Valve Lift: .488 Intake; .510 Exhaust •Lobe Center: 107° Intake; 117° Exhaust Camshaft Range Guide and Recommended Equipment: • Rough idle • Operating range of 2500-6500 rpm • Good midrange torque and response: 3000-4000 rpm range •Bracket racing suitability •Automatic with 3000 stall converter or manual transmission compatibility • Recommended 3.90 to 4.50 axle ratio • Edelbrock Performer RPM intake manifold recommended • 750 Holley carburetor recommended • 108 octane fuel required The “350” JASPER PERFORMANCE Engine was tested with headers, Edelbrock Performer RPM manifold and 750 Edelbrock Carburetor. Readings taken at SAE standards.

 

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