ATK Engines

Remanufactured Long Block Crate Engine | Fits 1996-2000 Chevy / GMC C and K trucks, vans, and SUVs | 350 CI / 5.7 Liter Vortec | 4 Bolt Mains | Complete with cast heads, center bolt valve covers, roller camshaft, oil pan,and timing cover

HP: 390 | TQ: 420 | Block: OE roller block 4 bolt main 1pc seal 1996-2000 | Bore/Stroke: 4.040” x 3.480” | Displacement: 350CI

OE roller block 2 bolt main 1pc seal 1996-2000 | OE Reground external balance rear of crank/internal balance front of the crank | 9.4:1 compression | Quick Fuel 670CFM Vacuum secondary’s electric choke | 4.060” x 3.480”

Block: 100% New American Made Block 1pc Seal with upgraded heavy duty 2 bolt main caps (this is not your typical GM 2 bolt main block) | Bore/Stroke: 4.000″ x 3.750″ | Displacement: 377CI | Crankshaft: Scat nodular iron external balance rear of the crank/internal balance front of the crank | Rods: Scat 4340 forged I beam with ARP 8740 bolts

Block: Dart Big M Sportsman 4 bolt main 2pc rear main seal | Bore/Stroke: 4.600” x 4.750” | Displacement: 6.3 L | Crankshaft: Scat 4340 forged internally balanced | Rods: Scat 4340 forged H beam with ARP 8740 bolts

With Valve Covers, Timing Cover & Oil Pan, Up to 8500 GVW ONLY | 4 Bolt Mains, 1 Piece Rear Seal | V/C Bolts through Center of Cover

Oil: Conventional / Non Synthetic 10W30 | Oil Filter: Wix or K&N | Timing: 34-36 Degrees with vacuum port plugged on carburetor

Oil: Conventional / Non Synthetic 10W30 | Oil Filter: Wix or K&N | Timing: 34-36 Degrees with vacuum port plugged on carburetor | Spark Plug Gap: .035”