JEGS Replacement Crate Engine for 1996-2000 GM Truck, SUV, Van with L31 Chevy Vortec 350ci/5.7L

JEGS crate engines are reverse engineered to create a product that has better than new quality. Reverse engineering allows any factory original defect to be found and removed; saving you time and money by keeping your vehicle out of the shop and on the road. Engines are factory checked after assembly to ensure proper operation. JEGS crate engines feature a 36 month/unlimited mileage warranty.

JEGS Easy Kits are designed by JEGS high-performance racing professionals to help you get all the performance parts you need for your race car, hot rod or truck.

This engine was designed as a direct replacement for 1996-2000 Chevy & GMC pickups, SUV's, and van applications. These vehicles introduced the L31 5.7L small block featuring Vortec cylinder heads that were developed for maximum power and efficiency. Producing up to 255 hp in factory spec, this engine can also be retrofitted into an older car with a performance carburetor to produce up to 290 hp.

Engine Specifications

Power Ratings:

• Factory Specs
  • Horsepower: 255 hp 
  • Torque: 330 ft.-lbs.

• Carbureted
  
  • Horsepower: 290 hp*
  • Torque: 375 ft.-lbs.

*Carbureted engine was tested using a performance dual plane intake manifold, 670 cfm carburetor, and an HEI distributor.

Block Information:

• 1996-2000 seasoned OE block
• 2-bolt main
• 1 piece rear main seal
• Passenger side dipstick 
• Displacement: 350 ci, 5.7L

Rotating Assembly:

• Crankshaft: OE reground cast 1 piece seal
• Balance: External rear, internal front
• Rods: OE reman powder metal 5.7 in.
• Compression Ratio: 9.6:1
• Pistons: Cast
• Rings: Moly

Camshaft Specs:

• Camshaft: Hydraulic roller
• Cam Duration @ .050 in.: Intake 191 / Exhaust 194
• Cam Lift: Intake 0.414 in. / Exhaust 0.428 in.
• Lobe Separation Angle: 112 lsa
• Timing Chain: Single roller

Cylinder Head Information:

• Cylinder Heads: Vortec cast iron
• Combustion Chamber: 64 cc
• Intake Runner: 165 cc 
• Valve Size: 1.940 in. Intake / 1.500 in. Exhaust
• Rocker Arms: Stamped steel 1.5

Oil Pan Information:

• Oil Pan: Black 4 quart
• Oil Pump: Melling standard volume

 Long Block Includes

• Short Block
• Camshaft
• Timing Set
• Cylinder Heads
• Valve Covers
• Timing Cover
• Oil Pan
• Oil Pump & Pickup Tube

 Notes: Does not have mechanical fuel pump provisions.