MerCruiser 807988-C 807988A2 Closed-Cooling Exhaust Riser 5.7L 350 7.4L 454 Pulley - Crankshaft Overall with ends is about

Overall with ends is about 14 1/4

but the 393-1573 Cap only was found on the Direct Reversing 700 & 800 outboards from 1960-1961 so here are some of the part numbers from the 1960-1961 800 80 6cyl model which is my best guess as to which outboard this came off of

ANGLED MOUNT - 10 Degrees

172123 and 172124) is completely functional

2L models 1988-2000 HOWEVER

MerCruiser 807988-C 807988A2 Closed-Cooling Exhaust Riser 5.7L 350 7.4L 454 Pulley - Crankshaft Overall with ends is aboutPart Number(s) Included MerCruiser 807988 C Exhaust Manifold Riser (You get the SINGLE RISER as pictured) Superseded Equivalent Possibly Related P N: 807988A2 807988A03 From a Closed Cooling Setup, (No front water inlet, scaling on the inside) General Application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.