Engine serial number

[dirty diesel]

The tag on my 350 above the starter says MW015506 and the casting number at the rear of the block is 0243878. Can anyone give me some info on this engine. It does have vortec heads.

 

[alldodge]

I find nothing with the numbers. Look here for the location of SBC casting numbers
http://www.mortec.com/location.htm

 

[Bt Doctur]

putting a 0 instead of the M gets this
Service Literature for MERCRUISER 5.0L MPI ALPHA DRAIN 5.0L ALPHA MPI
PARTS CATALOGS

• 884717 - 5.0L,350 MAG,MX 6.2L MPI Sterndrive

 

[dirty diesel]

I looked at the mortec link but it only shows locations. The serial number I got right from the mercruiser tag.

 

[alldodge]

The mortec site was to show where the casting number locations look like and where they are.
As BT Doc listed, if we use those numbers with a zero then it will be a 1998 5.7

 

[dirty diesel]

I know the original engine was a 350 mag that came in the boat in 1995 and was replaced a few years ago. Maybe the m indicates a factory reman or something?

 

[alldodge]

I know the original engine was a 350 mag that came in the boat in 1995 and was replaced a few years ago. Maybe the m indicates a factory reman or something?

You might be correct, look for the casting numbers to verify

 

[thumpar]

Doesn't it have the serials listed on the flame arrestor cover? My 96 shows engine, drive and transom serials.

 

[dirty diesel]

Yeah but for whatever reason it's the cover from the original engine

 

[Fun Times]

I know the original engine was a 350 mag that came in the boat in 1995 and was replaced a few years ago. Maybe the m indicates a factory reman or something?

Any chance of posting a photo of the metal tag riveted just above the engine starter?

The M in front of the W isn't a serial number mercruiser would use.....But it could start with either a M or W then have numbers to follow thereafter. A remanufactured engine from Merc could either start with a 9 or a G....Such as 1G******. Mercury Remanufacturing

Besides the serial number, following the information inside this bulletin may help as well. http://www.marinemechanic.com/merc/distributors/mercurymarine/sterndrive/gmblockcodes.PDF