OMC Cobra Arco 60125 Marine Alternator 55 AMP 2.3L 3.0L 4.3L 5.0L 5.7L GM Mando Flywheel 37-815866 2 Decal for 3

37-815866 2 Decal for 3

but rather the case style

So this would have been found on 305 & 350 applications with 12-3/4" flywheel and straight across bolt pattern for the starter

this is what is called the "Design-I" Flame Arrestor)

OMC Cobra Arco 60125 Marine Alternator 55 AMP 2.3L 3.0L 4.3L 5.0L 5.7L GM Mando Flywheel 37-815866 2 Decal for 3Part Number(s) Included Arco 60125 Marine Alternator Replaces Prestolite Motorola 55 AMP 12V Internal Regulator Negative Ground 2 Inch Mounting Foot, Single Groove Pulley Replaces OMC 983424 984565 985465 985466 986008 988247 3853853 3854182 3854809 3857298 3860769 General Application Compatibility Use as a replacement for most OMC Cobra applications 1986 1993 (2. 3L 4CYL FORD 3. 0L 4CYL GM 4. 3L V6 GM 5. 0L V8 GM 305 5. 7L V8 GM 350) . Just make sure