Can some one de code a casting number(please)

[48ford]

Hi Guys,
This is way off topic,but please stay with me.
I also have a 1982 boat(why ,i don't know)
The boat is a penn yan that is a inboard boat,not an outboard or I/O.
It has a v6 in it that was built by GM.It looks like a small block with 2 cylinders cut off.I'm sure it's a chevy,not a buick
It is called a crusader 165
The casting number in the back where a chevy small blocks is is cast 47159
The number that is stamped into the boss in the front of the head isT10221UD
   56926
The serial # that stamped into a tag thats bolted on is 34161
I think it's in the 4.3 family,but i'm not sure.
It has the same rotation as a car engine.
This one is toast,and I'm not sure if I will rebuild it or replace it with a small block.
Thanks Guys
Russ

[34ford]

looks like this might be it, up to 1996 motors

You can click on the part description and see a diagram


http://www.marinepartssource.com/crusaderpb/262.asp

[48ford]

Thank you,
It is a 4.3
It was a big help to me
Russ