Overview

ATK High Performance GM 383 Vortec 390 HP Stage 3 Long Block Crate Engines

Pack Vortec power and stroker torque in your ride with ATK High Performance GM 383 Vortec 390 hp Stage 3 long block crate engines. These engines are hand-built and balanced to ensure a strong-running, reliable engine for your daily driver or hot rod. The 460 ft.-lbs. of twist make these extremely versatile mills that are at home in a towing rig, muscle car, or street rod. Get back out on the road with the ground-pounding power that only a stroker can give you.

Engine specifications:

* HP: 390
* TQ: 460
* Block: OE roller block 4-bolt main 1-pc seal 1996-2000
* Bore/Stroke: 4.040 in. x 3.750 in.
* Displacement: 383CI
* Crankshaft: Scat nodular iron external balance rear of crank/internal balance front of the crank
* Rods: Scat I Beam 5.7 in. rods with ARP 8740 bolts
* Pistons: Hypereutectic 9.5:1 compression
* Rings: Moly
* Camshaft: Hyd. Roller
* Cam Specs: 220/224 @50 .495in/.502ex 110LSA
* Timing Chain: Double roller
* Cylinder Heads: Dart vortec cast iron 67cc/165cc 2.02/1.60
* Rocker Arms: Stamped steel 1.5 ratio
* Oil Pan: Rear sump 5qt (not for Chevelles with steering behind crossmember, some Corvettes and 62-67 Chevy II's)
* Oil Pump: Melling STD volume
* Balancer: Internally balanced – PowerBond #PB1046-N
* Flexplate: Externally balanced – Pioneer #FRA-159 (with scat kit)
* Intake Manifold: ATK HP dual plane
* Distributor: HEI (Iron Gear)
* Water Pump: OE long pump
* Carburetor: Quick Fuel 680CFM vacuum secondary's electric choke #HR-680
* Fuel Pump: Holley mechanical 110GPH #12-327-11
* Spark Plugs: Autolite #605
* Spark Plug Wires: 8mm

Engine info:

* Oil: Conventional/Non-Synthetic 10W30
* Oil Filter: Wix or K&N
* Timing: 34-36 Degrees
* Spark Plug Gap: .035 in.
* Firing Order: 18436572
* Octane: 91+
* Stall Converter: Stock
* Exhaust: 1 5/8 Headers

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