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View Full Version : 360 Crank cut and diced (pics...dial up beware! large pics)


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jeepsr4ever
12-13-2003, 01:12 PM
Here We show a AMC 360 crank (was badly worn and .03 over) Cut in 3 sections. I have been recieving emails about MAX bearing thickness and going under with the crank............ex. .010 rods .010 mains. The Cast srank you see here is a common AMC V8 360 crank found in almost all 360's. Grinding the crank makes the journal smaller and also puts it into spec for a common bearing size while offering a good uniform finish for the least amount of friction. Max grind should be .03 on a cast crank ONLY because the bearings only are made for a maximun of .03. Cast cranks tweak and give and are a good crank for most applications. Forged cranks offer a harder tougher casting and tweak under pressure alot less than cast, Again here .03 for a maximum grind. When you get a crank shaft ground MAKE SURE you clean out the oiling holes as the crankshaft grinder leaves grindings in the holes 90% of the time (at least what we have seen). We have seen .001-.003 oversize crank bearings for OEM applications and warrantee work. Here are the pics, note the thickness of the cross sections~
http://mpcrescenzo.imgbay.com/CRANKS%20001.jpg
http://mpcrescenzo.imgbay.com/CRANKS%20002.jpg
http://mpcrescenzo.imgbay.com/CRANKS%20003.jpg[/img]

Lifted79CJ7
12-14-2003, 06:11 PM
OK, so something I never thought about: The oil galley goes all the way through the crank to oil the bearings, correct? So how in the world do they drill that hole all the way through from one end to the other???? :-|
Jack

jeepsr4ever
12-14-2003, 06:17 PM
They are cross cast from a main journal to a connecting rod journal. but not all the way through the crank, the rod bearings get oiled by the mains...very important to keep the mains full of oil!!

Lifted79CJ7
12-14-2003, 08:21 PM
So oil is injected from the block at the main bearings into the crank. Then through the crank to the rod bearings, correct? Then the excess oil just seaps out as the engine operates, correct? Hmm, never really thought about how the rods bearings get oil before, pretty nifty design!
Jack

Holeshot
01-29-2004, 09:28 PM
Any chance you may get your hands on trashed 390 and 401 cranks?

I have been toying with the idea of using SBC aluminum rods and either machining the BE or turning the crank down to 2.1"

What's the most you think a guy could cut a 390/401 crank down to?

Thanks-in-advance.....Dave

jeepsr4ever
01-29-2004, 11:21 PM
Are you teasing me with the thought of moldex stroked cranks? :mrgreen:

78304CJ-7
02-01-2004, 02:01 PM
No Just the $2400.00 price tag :shock: :!: :!: :!: :!:

-RJ

jeepsr4ever
02-01-2004, 04:20 PM
actually you can send them a 401 crank and have it stroked and shipped back for less than $600..but new cranks :shock:

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