Re: [Amc-list] 390 vs. 401 crank casting numbers ....

[Greg Taylor <amundaza@xxxxxxxxx>]

Frank,
Quick correction .... the 390/401 has larger ROD BEARINGS ... main bearings are the same diameter as the 290-360 motors.

Sincerely, 
Greg Taylor :) <>< 
 
 

--- On Tue, 11/11/08, Frank Swygert <farna@xxxxxxx> wrote:

From: Frank Swygert <farna@xxxxxxx>
Subject: Re: [Amc-list] 390 vs. 401 crank casting numbers ....
To: amc-list@xxxxxxxxxxxx
Date: Tuesday, November 11, 2008, 4:48 PM

390/401 has larger main bearings, but the forged crank mains can be turned down
to fit 304/360 blocks. Might be able to line bore the block for the bigger
journals too. The bottom of the 304/360 cylinders have to be notched a little to
clear the longer throw of the 390/401 crank. Once the crank is fitted and rods
mounted rotate the assembly and note where the clearance needs to be ground.
That can be done with a die grinder since it's not rotating mass
(doesn't affect balance). There needs to be at minimum of 0.020"
clearance between the rod bolts and the block, a little more wouldn't hurt a
thing! 


      
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