Mercruiser - Mercruiser 454 / 502, 7.4L, Big Block Chevy

GM V8 BB Exhaust Manifold System Set
Your Price:
$517.99

Stock Mercury Replacement Big Block Chevy 454/502 Cast Iron 4" Exhaust Kit

700-58242

Mercruiser GM V8 BBC 454/7.4L and 502/8.2L Raw/Fresh Water Cooling System w/out Spacer

Qty Description OEM #
2 Exhaust Elbow 807988A2
2 Exhaust Manifold Assy. 807078A6
2 Gasket-Elbow 27-863724
2 Gasket-Manifold 27-46820
8 Screw-Steel-Zinc Placted 10-43749
2 Hose Fitting w/ Drain Plug Kit 22-806926A1
  • Direct Replacement for Mercruiser Big Block Chevy 454/502 Manifolds and Risers
  • Manifolds and 4" Risers Constructed from Cast Iron and painted with black corrosion resistant paint.
  • Individual Runners for Improved Performance over Stock Manifolds
  • Replaces Mercruiser #807078T10 and 89011A8 Manifolds
  • Replaces Mercruiser #807988A03 and 44354A3 Risers
  • Includes Bolts and Gaskets

GM V8 BB Exhaust Manifold w/ 4” Elbow Kit
Your Price:
$725.99

Stock Mercury Replacement BBC 454/502 Cast Iron 4" Exhaust Kit w/ 3" Spacer

700-58244

Stock Mercury Replacement BBC 454/7.4L and 502/8.1L Cast Iron Exhaust Kit w/ 3” Spacer
Mercury Big Block Chevy Exhaust kit with 3 Inch Spacer. This kit has 4 Inch Elbow Kit used with 4" exhaust hose. For 1981 & Up.

Qty Description OEM #
2 Exhaust Elbow 807988A2
2 Exhaust Manifold Assy. 807078A6
2 Spacer 3" 807476A3
2 Gasket-Fresh Water 27-860231
2 Gasket-Raw Water 27-863724
2 Gasket 27-863726
2 Gasket 27-46820
8 Flange Serrated Nut 11-49836
8 Stud (3/8" x 9-1/2") 16-11375
2 Hose Fitting w/ Drain Plug Kit 22-806926A1

GM V8 BB Exhaust Manifold System Set
Your Price:
$522.99

Stock Mercury Replacement Big Block Chevy 454/502 Cast Iron 3" Exhaust Kit

700-58241

Mercury Replacement Big Block Chevy 454/7.4L and 502/8.2L (Cast Iron) 3" Exhaust Kit

Qty Description OEM #
2 Exhaust Elbow 98504A3
2 Exhaust Manifold Assy. 807078A6
2 Gasket-Elbow 27-863724
2 Gasket-Manifold 27-46820
8 Flange Serrated Nut 11-49838
8 Stud (Steel) 16-49545
2 Hose Fitting w/ Drain Plug Kit 22-806926A1
  • Direct Replacement for Mercruiser Big Block Chevy 454/502 Manifolds and Risers
  • Manifolds and 3" Risers Constructed from Cast Iron and painted with black corrosion resistant paint.
  • Riser has 15° down angle mounts with studs and nuts 1983-1995 Mercruiser V6, V8 engines with the center rise manifolds, uses 3" hose or bellows
  • Individual Runners for Improved Performance over Stock Manifolds
  • Replaces Mercruiser #807078T10 and 89011A8 Manifolds
  • Replaces Mercruiser #98504A3 Risers
  • Includes Bolts and Gaskets

GM V8 BB Exhaust Manifold w/ 3” Spacer
Your Price:
$730.99

Stock Mercury Replacement BBC 454/502 Cast Iron 3" Exhaust Kit w/ 3” Spacer

700-58243

Stock Mercury Replacement BBC 454/7.4L and 502/8.1L Cast Iron Exhaust Kit w/ 3” Spacer
Mercury Big Block Chevy Exhaust Kit with 3 Inch Spacer. This kit has 3 Inch Elbow Kit used with 3" exhaust hose. For 1981 & Up.

Qty Description OEM #
2 Exhaust Elbow 98504A3
2 Exhaust Manifold Assy. 807078A6
2 Spacer 3" 807476A3
2 Gasket-Elbow 27-863724
2 Gasket-Elbow 27-863726
2 Gasket-Manifold 27-46820
8 Flange Serrated Nut 11-49838
8 Stud 16-97520
2 Hose Fitting w/ Drain Plug Kit 22-806926A1

GM V8 BB Exhaust Manifold w/ 6” Spacer
Your Price:
$797.99

Stock Mercury Replacement BBC 454/502 Cast Iron 3" Exhaust Kit w/ 6” Spacer

700-58245

Stock Mercury Replacement BBC 454/7.4L and 502/8.1L Cast Iron Exhaust Kit w/ 6” Spacer
Mercury Big Block Chevy Exhaust Kit with 6 Inch Spacer. This kit has 3 Inch Elbow Kit used with 3" exhaust hose. For 1981 & Up.

Qty Description OEM #
2 Exhaust Elbow 98504A3
2 Exhaust Manifold Assy. 807078A6
2 Spacer 6" 807477A2
2 Gasket-Elbow 27-863724
2 Gasket-Elbow 27-863726
2 Gasket-Manifold 27-46820
16 Screw 10-12244
2 Hose Fitting w/ Drain Plug Kit 22-806926A1

Exhaust Manifold 807078T08
Your Price:
$197.99

Mercruiser Big Block Chevy, 7.4L, 454/502 Exhaust Manifold 807078T08

700-51240

Mercruiser Big Block Chevy Exhaust Manifold Kit 454/502 89011A8 / 807078T08

Qty Description OEM #
1 Exhaust Manifold 807078T08
1 Hose Fitting w/ Drain Plug 22-806926A1
1 Gasket-Elbow 27-863724
1 Gasket-Manifold 27-46820
  • Direct Replacement for Mercruiser Big Block Chevy 454/502 Manifold
  • Manifold Constructed from Cast Iron and painted with black corrosion resistant paint.
  • Individual Runners for Improved Performance over Stock Manifold
  • Replaces Mercruiser #807078T10, 80707T08 and 89011A8, 807078A6 Manifolds.
  • Can use with 4" or 3" Riser
  • Includes Bolts and Gaskets
  • 3-Year Warranty
  • Sold Each.