Description

Mileage status: Donor-vehicle odometer mileage is not provided for this crate-engine assembly. Any break-in or oil-change distance below is post-installation guidance, not prior mileage.

ATK HP55 is a small-block Chevy 383 stroker base engine. It is rated at 500 hp and 505 lb-ft, with the following core configuration:

Core specifications: 383 cu. in. displacement, 500 hp, and 505 lb-ft torque.

Confirm vehicle fitment and the included components for your application before ordering.

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. 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.

Shipping & delivery

Standard orders are normally handled and processed in 1 business day, Monday through Saturday, after payment is confirmed and product availability has been verified. Estimated carrier transit is 1-2 days after dispatch, with transit days Monday through Saturday. Combined with the 1 handling period above, the estimated total delivery time is 1-3 business days for standard destinations. These are estimates, not guarantees. Oversized or freight shipments, deliveries to Alaska, Hawaii, or U.S. territories, and deliveries requiring carrier appointments may take longer or require a separate quote. See our Shipping Policy.