ATK HP90 Chevy 383 Vortec Marine Base Engine 345HP

Engine Specifications: HP: 345 TQ: 445 Block: OE roller block 4 bolt main 1pc seal 1996-2000 Bore/Stroke: 4.040” x 3.750” Displacement: 383CI Crankshaft: Scat Nodular Iron external balance rear of crank/internal balance front of the crank Rods: Scat I Beam 5.7” Rods with ARP 8740 Bolts Pistons: Hypereutectic 9.5:1 compression Rings: Moly Camshaft: Hyd. roller Cam Specs: 210/215 @50 .462in/.470ex 112LSA 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 Flexplate/Flywheel: Externally balanced – Pioneer #FRA-159 (with scat kit) or Flywheel depending on application Recommended Components: Balancer: Internally balanced – PowerBond #PB1046-N or per application Intake Manifold: Marine grade dual plane Distributor: Marine grade pro billet (iron gear) Water Pump: Per application Carburetor: Marine grade Quick Fuel 650CFM mechanical secondary’s electric choke #M-650 Fuel Injection: Can be used with MPFI, but custom tuning required to ECM. Fuel Pump: Marine grade 110GPH mechanical or an Electric fuel pump Spark Plugs: Autolite #605 Spark Plug Wires: Marine grade 8mm per application Engine Info: Oil: Conventional / Non Synthetic 10W30 Oil Filter: Wix or K and N Timing: 34-36 Degrees Spark Plug Gap: .035” Firing Order: 18436572 Octane: 91+ Stall Converter: Stock Exhaust: 1 5/8 Headers or stock manifolds Notes: This is a MARINE engine. The bearing clearances and camshaft profile are designed for marine use. Not intended for automotive applications. Disclaimer: The parts listed are ATK’s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. ATK reserves the right to substitute parts used in engines if necessary.

Highlights

• Oil: Conventional / Non Synthetic 10W30 with Comp Cam zinc additive #159 for first 3000 miles
• Oil Filter: Wix or K&N per application
• Timing: 34-36 Degrees

Specifications

• Engine Displacement: 383 cu. in.
• Cylinder Head Material: Cast Iron
• Intake Manifold Included: No
• Oil Pan Included: Yes
• Timing Cover Included: Yes
• Harmonic Balancer Included: No
• Flexplate Included: No
• Flywheel Included: No
• Material Type: Cast Iron
• MFG. Part #: HP90
• GTIN Code: 00653517287787
• Sold in Quantity: Each
• Brand: ATK Engines

Emissions Notice

Emissions warning: this part is for vehicle engine changes, not direct oem engine replacements. In California, engine changes are legal when done in compliance with California bureau of automotive repairs (bar) engine change policy. For assistance, call bar referee at: (800) 622-7733. And see https://bar.Ca.Gov/consumer/smog_check_program/engine_changes. All customers must comply with federal epa mobile source enforcement memorandum no. 1a (and addendum) and all applicable state regulations when conducting engine changes. Improper installation and/or use of this part in California may subject the installer and/or owner to a $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and laws of all states for use of this engine change part on makes or models of vehicles that render them noncompliant with applicable state and/or federal emission laws with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine