MerCruiser 807988-C 807988A2 Closed-Cooling Exhaust Riser 5.7L 350 7.4L 454 Pulley - Crankshaft 172123 and 172124) is completely

172123 and 172124) is completely functional

300 HP--1983

2L models 1988-2000 HOWEVER

For 1984-1993 the OMC part number is referenced as 983874 / 0983874 and is usually stamped with the GM part number of 14095286 Early OMC versions of this were typically stamped 910840 / 0910840 or 983064 / 0983064 (1982 & 1983) rather than having the GM stamped number

Water Temperature Tested OK

MerCruiser 807988-C 807988A2 Closed-Cooling Exhaust Riser 5.7L 350 7.4L 454 Pulley - Crankshaft 172123 and 172124) is completelyPart Number(s) Included MerCruiser 807988 C Exhaust Manifold Riser (You get the SINGLE RISER as pictured) Superseded Equivalent Possibly Related P N: 807988A2 807988A03 From a Closed Cooling Setup, (No front water inlet, scaling on the inside) General Application Compatibility Specifically, ths particular riser was from a Closed Cooling Configuration from 1996 1998 as it doesn't have a fitting on the front for a water hose 5. 0L 305 5. 7L 350 260hp 7.