Understanding Mercruiser part numbers...Replacement exhaust manifold?

[1lastweekend]

Hi, I have a 1981 Rinker V170 with the 120HP Mercruiser 2.5L GM engine. Last fall while winterizing the boat I noticed water running down the exhaust side of the block, and immediately thought oh crap the block is cracked. I completed the winterization, but not before running the motor for an hour at idle to check the oil. Luckily I didn't make a milkshake so I thought at least maybe the crack is only external. This weekend I got the boat out and used a mirror and flashlight to do some looking around, and to my surprise the block is not cracked- the exhaust manifold is. My question is: What is the part number structure for a replacement OEM exhaust manifold? The manifold itself says 63122 C stamped on the casting, but when I Google that I get MC-1-63122, is there a "C" series casting that's different from others? Or is it all the same? Thanks for any help, love this site!!

 

[Bondo]

Ayuh,..... Use the motor's serial number to nail down which manifold ya need,....

 

[alldodge]

Your part number is 63122A14
http://www.mercruiserparts.com/bam/s.../30883/1057/12

Agree, S/N work best

iboats is out of stock and appears to have Barr but don't know if the Barr is out of stock or the Merc
http://www.iboats.com/MANIFOLD-4-CYL...iew_id.1829067

 

[1lastweekend]

Great thanks for the help, I found what I needed, should be delivered Thursday. If I get the old one off tonight, and the new one installed Friday, should be tested and on the water by Saturday I hope...