ATK HP105 Chevy 383 Stroker Marine Base Engine 380HP

This engine is ATK’s reman version of the Mercruiser 377CI MPFI engine with a 4.030? bore (383ci). It has the upgraded 4340 Forged Crankshaft and Forged Pistons along with the Mercruiser camshaft installed. It is to be used with the Mercruiser MPFI system, aftermarket EFI or a carburetor conversion. This engine will make 405HP @ the crankshaft and 380HP @ the prop which is how Mercruiser rated their power ratings. Engine Specifications: HP: 380 Prop Block: OE roller block 4 bolt main 1pc seal 1996-2000 Bore/Stroke: 4.040 x 3.750 Displacement: 383 (Reman Mercruiser 377) Crankshaft: Scat 4340 forged external balance rear of crank/internal balance front of the crank Rods: Scat 4340 forged I beam with ARP 8740 bolts Pistons: Forged 9.1:1` compression Rings: Moly Camshaft: Hyd. roller Cam Specs: 215/220 @50 .457in/.474ex 112LSA Timing Chain: Single Roller Cylinder Heads: Dart vortec cast iron 67cc/165cc 2.02/1.60 Rocker Arms: Stamped steel 1.5 rockers Oil Pan: Rear sump 5qt Oil Pump: Melling Flexplate/Flywheel: Pioneer #FRA-159 external balance 168 tooth (with Scat kit) 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
• Oil Filter: Wix or K&N
• Timing: 34-36 Degrees with vacuum port plugged on carburetor
• Spark Plug Gap: .035”

Specifications

• Engine Displacement: 377 cu. in.
• Intake Manifold Included: No
• Oil Pan Included: No
• Timing Cover Included: No
• Harmonic Balancer Included: No
• Flexplate Included: No
• Flywheel Included: No
• Material Type: Iron
• MFG. Part #: HP105
• GTIN Code: 00653517527357
• 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