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MerCruiser 7.4L 454/502 V8  Exhaust / Cooling System

See reference picture below!

Reference Number

See reference picture below

Type OE# Part# cart.gif (2032 bytes)
1 Exhaust riser elbow 4" 807988A 2 51140 Sorry, no longer available
2 Riser gasket full flow 27-863726 69726 Sorry, no longer available
3 Riser gasket restrictor 27-863724 69724 Sorry, no longer available
4 Riser gasket block off, used only with closed cooling 27-863725 1 69725 Sorry, no longer available
5 3" Exh riser block Kit 807476A 6 / 93320A 5 18-1908k Sorry, no longer available
5 3" Riser block Kit - 50310 Sorry, no longer available
5 6" Riser block Kit - 50610 Sorry, no longer available
6 Exhaust manifold 807078A 6 51240 Sorry, no longer available
7 Manifold gasket 27-46820 69820

8 Exhaust hose upper 4" x 4", clamps not included 32-44348T 64348

9 Exhaust hose to pipe lower 4", clamps not included, elbow to y pipe 32-14358T 64358

10 Exhaust flapper pair 4" 807166A 3 65166

11 Circ Pump 850454 1 64454

12 Pump gasket 27-49110 69110

13 Gasket 25-41812 63812

14 Cork gasket 27-47510 63510

15 Thermostat 140 degree 807252T 1 64252-1

15 Thermostat 160 degree 807252T 2 64252-2

16 Base gasket 27-53045 1 63045

17 Top gasket 27-331799 2 63179

18 Sleeve 23-806922 806922

19 Thermostat O-ring 25-30224 63244

20 Temp sender 805218T 63752

21 Temp sender 3/8" 97257A 1 64257

not shown V-belt 46" with 7" pulley 57-48120A 1 18-15460

not shown V-belt 44" use with 5-1/2" Pulley 57-49213A 1 18-15470

not shown Power steering v belt use with 5-1/2" Pulley 52" 57-37619T 18-15520

not shown T-stat housing Kit 90736A24 13221

not shown 6" Exhaust riser Kit 93322A12 50610

not shown Exhaust pipe gasket 27-848254 39254

not shown Exhaust pipe gasket 27-848147 69147

not shown Exhaust header gasket 27-841234 39234

not shown Thermostat Kit 140 degree 807252K 1 64252K1

not shown Thermostat Kit 160 degree 807252K 2 64252k2

merc74exh.jpg (153525 bytes)