4.3 VP Engine Replacement

[Sunken Ship]

I have a 2000 Larson that I bought as a project. Boat has been sitting for some time and the engine short block (maybe long) has to be replaced. It now has a Jasper 14099090M block that is supposed to be for the years '96-'98.

Which block can I use to replace this block? Will a 14099090 work or does it have to have the "M" at the end of the cast number? I also read that the marine crank is drilled larger and deeper in diameter to accommodate marine out drives.

Appreciate any help.

 

[Jason89sunbird]

Here is a good link about 4.3 block differences. They say the M stands for metric holes, i.e. Starter and accessory holes drilled into the block are supposed to be metric instead of sae. I would double check your original bolts that went into your M block. If the head of the bolt has a number stamped into it it is metric, if it has radial markings its standard sae threads.

http://67-72chevytrucks.com/vboard/s...d.php?t=178966

Bolts
https://www.boltdepot.com/fastener-i...ade-chart.aspx

 

[bruceb58]

Buy anything newer than 96 as that will have the Vortec heads.

http://www.michiganmotorz.com/vortec...ent-p-283.html

 

[Bondo]

I also read that the marine crank is drilled larger and deeper in diameter to accommodate marine out drives.

Ayuh,...... Where'd ya read That,..??

I bet it wasn't here at iboats,.....

If it was, Where, that needs to be edited,.... Pure whale poo,....

 

[Sunken Ship]

Thanks for the response Bondo....No it wasn't here. I think it was an S10 forum when I was digging for the block cast number (14099090M). Then I read the "M" indicated Metric starter bolts. This makes sense, I was pulling engine internals today and the starter bolts were in fact metric.