Need Assistance?


Sales & Support

Looking for some good advice, or need a quote?

We'd love to help.


100% Secure

Shopping with Michigan Motorz is 100% secure!

Our checkout is encrypted using SSL certificates.

8.1L Vortec Marine Engine, 425 hp, HO (2001-Current)

Product Images

8.1L Vortec Marine Engine, 425 hp, HO (2001-Current)

Product Details

Item Number: 8100-R425


$5,799.00 plus shipping

2001-current Vortec 8.1L marine engine (one-piece rear main seal, roller cam and roller lifters). This motor has been professionally remanufactured to meet or exceed GM OEM marine engine stock specifications. Rated at 425 hp at the crank (depending on steel crank, ECM calibration, etc). This 8.1L engine will ONLY work in 8.1L applications. This long block will NOT work as a 454 ci replacement. $1,100.00 core charge.

This 8.1L, 425 hp, HO marine engine comes equipped with the following:

  • 8.1L GM marine engine (standard rotation)
  • Corrosion resistant black urethane paint
  • Vortec cylinder heads, engine block and all internal components
  • Roller cam and roller lifters
  • 8-quart marine oil pan
  • Fel-Pro marine head gaskets 
  • Harmonic balancer, timing cover and circulation pump
  • One-Year (parts & labor) Warranty
  • Will ONLY work in existing 8.1L applications
  • Standard rotation ONLY.
  • The $1,100.00 core charge is in addition to the price shown above.

    Steel crank option available for an additional $600.00

    Email or call (248) 524-9600 to place your order, or for a shipping quote.


    Have Questions?

    Need some help? Ask a question about this item:


    Ask a Question:

    100% Secure Shopping

    Shopping with Michigan Motorz is 100% secure!

    Read More

    Sales & Support



    Mon-Fri, 9am-5:00pm EST

    Sat, Appointments Available

    Sales & Support

    Fast Shipping

    Same Day Dispatch

    Shipping Information

    Worldwide Shipping

    Shopping Cart

    0 items - $0.00

    View Your Cart

    Shopping Cart

    Need Help? Phone: 1-248-524-9600.  Follow Us: Facebook Twitter Youtube

    Michigan Motorz Is Proud to Carry the Following Manufacturers:

    View Barr Marine View DART View GM Marine View Edelbrock
    View Marine Power View INDMAR View MerCruiser
    View Quick Fuel View Trident Marine