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Re: 383 piston with 440 crank and rods
[Re: Moparnut426]
#2106809
07/09/16 01:37 PM
07/09/16 01:37 PM
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Joined: May 2008
Posts: 1,131 Thigh-Gap Junction
@#$%&*!
New user name, Same old jerk!
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New user name, Same old jerk!
Joined: May 2008
Posts: 1,131
Thigh-Gap Junction
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We figured were gonna have to take .150 to clear. I sure hope cause Im having a hard time finding a machinist who wants to do it. They all seem scared to make the cut. I told them all its no big deal, I wish I had a lathe good enough cause I would do it myself but the one I have access to is way to outa spec and would sing like a canary if I chucked it up.
When I built my 451 many years ago I just lightly beveled the 440 crank and took my 4" angle grinder to the inside of the block. It didn't take much work at all but the shop that balanced it did [censored] about it. Lots of drilling. They weren't into the big engines so much.
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Re: 383 piston with 440 crank and rods
[Re: AndyF]
#2107185
07/10/16 09:36 AM
07/10/16 09:36 AM
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Joined: Sep 2003
Posts: 19,708 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,708
north of coder
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Here is a picture of a 383 stroker rotating assembly. Diamond piston, 440Source rod and a 413 crank that was in process of being turned down. If you look close you can see the spud mounted on the crank flange for the lathe. Using an aluminum spud allows the lathe chuck to grab hold of something solid rather than trying to grab on the flange. On the other end you use a live center that goes in the nose of the crank. Runout is usually less than 0.001 when using this setup. spuds are super easy to whip up, and unless your chuck is messed up, and the point of your tail stock is gakked, runout is as you said; just a thou or two. one thing to remember about an interrupted is, you need a nice, ridged tool post with a cutting tool that is up to the job, which means [in my mind at least] an inserted holder of 1" square or so. not a wobblechuck baby toy lathe 3/8"-1/2" brazed insert tool. the tail stock needs to be a nice, ridged unit as well.
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