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Exhaust Manifold Kit for Mercruiser GM V6 4.3L 262 3 Inch GLM58221


  • Part #: GLM58221

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I have Fresh Water Cooling with Anti-Freeze in my Manifolds


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This GLM 58221 Exhaust Manifold Kit is for Mercruiser V6 Before 1986 with 3" exhaust
You can replace your existing exhaust with this kit utilizing your existing 3" I.D. Exhaust hose, to be connected to the riser.

2 - GLM # 51110 3" Risers
2 - GLM # 51220 Manifolds

2 - Riser Gaskets & 2 - Manifold Gaskets

Mercruiser used 3.0" Risers from 1983-1986. If you do have a 1986, measure the outlet on the riser. This was a transition year & some are 4.0".

NOTE: This exhaust kit WILL NOT FIT Dry Joint Exhaust Systems.

Cross Reference Component Part Numbers
Mercury Quicksilver Manifold: 99746A17
Riser: 98504A3
Osco Manifold: 9745
Riser: 8503A
Barr Manifold: MC-1-99746
Riser: MC-20-98504
GLM Manifold: 51220
Riser: 51110
Kit (4 Manifold/Riser): 58221
Sierra Manifold: 18-1952-1
Riser: 18-1970-1
Mallory Manifold: 9-40505
Riser: 9-40557

GLM Cast Iron Manifolds and Risers come with a 3-year limited warranty!

Extra Shipping applies for Manifold/Riser Kits: $59 for states east of the Mississippi, $79 for states west of the Mississippi
Shipping outside of the contiguous US will be sent by email after the order is placed

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