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Help for mike on engine block please

M

mike.l

Member
Hi i started a thread on 4.3 with cracked block and got some great help. My engine casting #is 14099090 i have found a block {a complete engine from a 1999 truck the #is 14099090m what does the m stand for marine or metric need some help here mike ( did not think US built anything metric)
 
Why don't you just get a remanufactured marine short blocK? Really the 4.3 isn't very expensive (for boat stuff that is) comes with a warranty and will be the right thing, not some random truck engine.
A road-going vehicle will have a different cam and other subtle differences (pistons, etc) that make them unsuitable for marine use. Bite the bullet or change to cheaper toys.
 
o2batsea said:
Why don't you just get a remanufactured marine short blocK? Really the 4.3 isn't very expensive (for boat stuff that is) comes with a warranty and will be the right thing, not some random truck engine.
A road-going vehicle will have a different cam and other subtle differences (pistons, etc) that make them unsuitable for marine use. Bite the bullet or change to cheaper toys.
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Hi not what i want to do if you do not know the answer do not reply
 
Please lets be nice in here as o2batsea is just sharing his thoughted suggestions for you out-loud is all as many here have been in the same place as you are right now with what route is best to take for what you plan to do with the boat "use-wise" of making it last the longest, perform the best and of course being cost efficient as possible too for the long run.

The M really ought to mean "Metric" fasteners for starter, engine mounts, and transmission.....,From A GM service tech, https://www.justanswer.com/chevy/8stws-chevrolet-difference-4-3-blocks-numbered.html

Also you can find many places/people online that mentions 14099090M came out of tucks/S10's, etc., not "just" Marine/boats lowering the chance of the M meaning Marine.

The following from GM marine seems to suggest they went to Metric fasteners supporting the theory,
http://www.gmpowertrain.com/Libraries/Marine_Engines/Vortec_4_3L_V-6_Marine.sflb.ashx ,
Additional Features for GM Marine Engines:
¶Cylinder head gaskets have stainless steel core for corrosion resistance ¶Cast aluminum oil pan provides increased strength and noise reduction and is epoxy painted for corrosion protection ¶Nodular grey iron bearing caps ¶Metric fasteners on engine mounts, starter bosses and bell housing ¶Eccentric main bearings for increased engine life
replacement of the “net lash” studs with a set of special conversion studs that have metric threads on the bottom, along with 3/8″ threads on the top.

https://forums.iboats.com/forum/eng...2-4-3l-vortec-engine-id?p=4393188#post4393188
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Had the M be in an different area then it could have meant made in Mexico.
motors made by GM in Mexico, may have an "M" or "ML" prefix stamped into the front pad of the block followed by a series of numbers which is the serial number of that particular crate replacement motor. You may also see a raised casting on the block or heads of "Hecho en Mexico" which means "Made in Mexico". Many of the new GM crate motors are being made in Mexico.
https://www.justanswer.com/chevy/2ntw2-350-bolt-main-block-casting-number-3970010.html
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From the following marine engine link I think the dates are off a bit between the 090 and 090M but it seems to list a slight difference though.
http://www.rapidomarine.com/default.aspx?p=/block_casting_id_.aspx
090…………...96-99……….4.3L…Roller Cam Engine With
Balance Shaft. Has 6 Bolt
Timing Cover And 10 Bolt Oil
Pan Rail. Head Casting Number
772 Last Three Digits.

90M…………….00-05……….4.3L…Roller Cam With Balance
Shaft. Has Roller Rockers.
Head Casting Should Be 113.
10 Bolt Oil Pan.
 
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