MerCruiser 87290A4 87110 Thermostat Housing Assembly V8 SBC 5.0L 305 5.7L 350 Flywheel Housing 3L 1988-1991 Possibly found on

3L 1988-1991 Possibly found on some earlier models as well

If you are unsure if this will work for you please check with your parts manual

but is just the portion that mounts to the trim cylinder

which is very rare for this type of manifold

MerCruiser 87290A4 87110 Thermostat Housing Assembly V8 SBC 5.0L 305 5.7L 350 Flywheel Housing 3L 1988-1991 Possibly found onItem Details Fits Various MerCruiser SMALL BLOCK CHEVY engines, 1987 1994 (V8 5. 0L 305 5. 7L 350) NOT SUITABLE FOR BBC (7. 4L 454 8. 2L 502) APPLICATIONS THAT ALSO HAVE THE 87110 CASTING AS THE HOLES ARE DRILLED IN THE WRONG POSITION. Yours should look just like this. Condition Notes: Overall Good condition Cleaned & Repainted Includes NEW THERMOSTAT & GASKETS Freshwater used part Major Parts included as pictured: Thermostat Housing Assembly 90736A18