H20 T-20957 and T-20970 replacement exhaust manifold kit for Mercruiser 89011 and 98054

Single T-20957 and T-20970 Manifold Kit

  • Select Open or Restricted for your Riser Gasket 

    Replaces Manifold Part Numbers:  

    • MerCruiser: 89011
    • Barr: MC-1-89077
    • Sierra: 18-1957-1

    Replaces Riser Part Numbers

    • MerCruiser 98503 and 98504
    • Barr: MC-20-98504
    • Sierra: 18-1970-1

    Used on:

    • GM Big Block 454 cu.in.

    Backed by a 3 Year Warranty 

    Hardware Not Included 

30211 Herberg Road

Shafer, MN 55074,

United States 

Tel:  (651)465-6613
Fax: (651)465-6614

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