251 in the American M37 - Steel Soldiers::Military Vehicles Supersite

m376x6 · 11-15-2009, 00:13

The administartors closed the thread because it actually belongs in the classifieds. By reading the post I have questions. It states it has a 251. These were used in the Canadian versions. Because the 251 is 2 inches longer than the stock US M37 235cuin engine, the folks in the north had a slightly different truck. The radiator was moved forward and an extension for the hood was grafted on as well as other small diferences to account for the longer block. As I looked at the pictures of this truck, I see no modifications to either the length of the hood or the firewall and/or the position of the transmission stickshift. How does one fit a 25 inch long block in a 23 inch long compartment? It has been a long time since I owned a Canadian version, my memory might be skewed (perhaps failing). Are there any folks such as CitizenSoldier or others who are very familiar with these trucks and still own them who would care to chime in? Thanks

Regards,
M376X6

zak · 11-15-2009, 08:56

I believe the only difference is the front motor mounts moved foward, 10" clutch, and the radiator moved foward. There was no top sheet metal peice to cover the radiator top. And the different trans and pto. The hood is the same.

Bill W · 11-15-2009, 09:01

You can fit one in to a american 37 but you have to take out the fan spacer so fan doesn't hit the rad, changing out belts is a challenge as you have very little room left up front

badgmc56 · 11-15-2009, 09:13

My M-37 had a 251 in it and no sheet metal modifications. As Bill W said, there was no fan spacer.

m376x6 · 11-15-2009, 13:10

Thanks Guys, I must have had an odd Canadian M37. The radiator had been moved forward and an odd extension had been added to the hood end cap to cover the relocated radiator top shroud. It appeared all factory with all the standard Canadian trimmings. For folks looking to add some additional power without going to a lengthy modification like a V8 swap is the 251 a relatively easy changeover? I have a shop with all the goodies so a V8 conversion is no big deal, but for some folks, this might be an easy upgrade. Thanks for comments.

Regards,
M376X6

zak · 11-15-2009, 18:11

Other than drilling new front mounting holes and changing the radiator mounts, it will bolt up. Some flywheels were drilled for both size clutches. I think finding the canadian trans might be a problem.

Steel Rain · 12-25-2009, 20:32

Where did you find the 251? I am in the process of procuring an M37 and I will definitely want more power than stock for hiway speeds over 55! Thanks guys! Awesome site, glad I stumbled on it!
Art

m376x6 · 12-25-2009, 22:51

It may sound odd to some folks, but taking tours of junk yards can be very helpful, entertaining, and informative. I love the yards where there are old treasures that didn't fall prey to the recent spike in scrap prices. I love to pop the hood on all Dodge trucks, looking for that hidden treasure of an unmolested Hemi sitting there. You'll find flat head Mopars in a lot of trucks and cars even up through the late 60's model years. There is a lot of information you can find on the old flat heads. The main difference is in the length of the blocks. The 230 engine in the M37 that came stock in the US, the T241, was the shorter of the two blocks. Much like the main difference between the Mopar big block is the B and RB engines. The RB stood for Raised Block, and allowed a longer stroke to get to the higher cubes such as the 426 and 440. You're lucky in that the Gents on here who have the long block flatties in the M37's are very helpful and can provide pics if details are called for. Good luck. In all probability you'll find what many of us have, The M37, and others in that size class that are tactical in base design, are the ideal balance between size and capacity. But be warned, owning a Deuce or 5 Tonner can be adicting!

Regards,
M376X6

Steel Rain · 12-25-2009, 22:57

hey 6, thanks for the tips, I wish there was a junkyard close that I could go exploring in. The closest "pick and pull" junkyard is relegated to 1970's to late 90's cars and trucks. I have considered other "non standard" swaps, but they seem far more involved than I'm willing to put in at this point! I definitely would like more power though so any help is welcomed and appreciated!
Art

hndrsonj · 12-25-2009, 23:08

If you are looking at engine swaps, have you seen uglytruckling.com ? I just installed their disk brakes and am totally impressed. Upgraded master cylinder is next. They also have power steering kits and 318 swaps.