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Steel crank in later blocks?
https://slantsix.org/forum/viewtopic.php?t=27686		 Page 1 of 1
Author:  mopar_nocar [ Fri Mar 07, 2008 8:58 am ]
Post subject:  Steel crank in later blocks?
Any heavy duty steel cranks in later engines? OR will the steel cranks fit in later blocks?

sb
Author:  Doc [ Fri Mar 07, 2008 9:05 am ]
Post subject: 
Cast cranks went into all SL6 engines in the "mid 70's" (1976-77)
There is no easy way to put a forged crank into a cast crank engine block.
Some special main bearing shims could be made to make this possible but the last time I checked, I was still "tripping over" a lot of forge steel crank Slant engines.
DD
Author:  mopar_nocar [ Fri Mar 07, 2008 9:20 am ]
Post subject:  i'm just a little confused....
the guy at the machine shop I use "had" to use the later cam bearings, but he insists it is a steel crank.....if I end up with the wrong mains, would they not fit?

sb
Author:  Jopapa [ Fri Mar 07, 2008 9:26 am ]
Post subject: 
Quote:
Cast cranks went into all SL6 engines in the "mid 70's" (1976-77)
There is no easy way to put a forged crank into a cast crank engine block.
Some special main bearing shims could be made to make this possible but the last time I checked, I was still "tripping over" a lot of forge steel crank Slant engines.
DD
In quotation marks because you mean it literally, huh? :lol:
Author:  slantzilla [ Fri Mar 07, 2008 10:27 am ]
Post subject:  Re: i'm just a little confused....
Quote:
the guy at the machine shop I use "had" to use the later cam bearings, but he insists it is a steel crank.....if I end up with the wrong mains, would they not fit?

sb
It may be time to find a new machine shop. You can tell a cast crank just by looking at it. The rods and mains are a lot narrower than a steel crank motor. IIRC, the cast rods are like 1" wide and the forged are 1-1/4" or so?
Author:  Jopapa [ Fri Mar 07, 2008 10:32 am ]
Post subject:  Re: i'm just a little confused....
Quote:
Quote:
the guy at the machine shop I use "had" to use the later cam bearings, but he insists it is a steel crank.....if I end up with the wrong mains, would they not fit?

sb
It may be time to find a new machine shop. You can tell a cast crank just by looking at it. The rods and mains are a lot narrower than a steel crank motor. IIRC, the cast rods are like 1" wide and the forged are 1-1/4" or so?
Another way to check if you're not sure by eyeballing is to lightly tap on it with a wrench. "Clang!" = forged. "Klunk!" = cast.
Author:  mopar_nocar [ Sat Mar 08, 2008 8:22 pm ]
Post subject: 
It ended up being a mix up in CAM bearing part numbers, which initiated the two worried posts on my part. As it turns out, I have the later cam bearings installed in 75 STEEL crank motor. The old boy who runs the machine shop I frequent is a good guy. He's been in the same spot since 1963! He did a b-e-ayoo-tiful job installing my oversize valves and cutting the pocket behind the exhaust valve. I'm really looking forward to getting this motor in and going. Hopefully by the end of next week!

I put the crank in today before I ran out of daylight. I'll finish up the short block and the tranny tomorrow. I'm still waiting on some pushrods to finish the long block.

sb
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