[Land-speed] Destroking a Crankshaft...

[Larry Mayfield]

I have been toying around with an idea for a new motor for my Sunbeam.  
But it would require a destroked crank to meet the displacement goals. I 
have been searching around for such cranks and they are pretty rare. 
Some are apparently used in a Nascar class somewhere which has a 
displacement limit.  I know about off set grinding to either stroke or 
destroke abit.  But, even with a brand new crank, I would not be able to 
get there.  So, my question... I know cranks can be welded up and 
reground. But how much can that be used?  If I wanted to take a crank 
down with a stroke difference of say 1/2 inch? That seems like a LOT, 
lol, as it would require a 1/4 inch or more of buildup on the inside of 
the rod  throw.   Even if I started with a  289 ford crank it would 
still be a lot.  And is that even doable with a cast crank?  I would 
expect it to be ok on a forged steel or billet crank, though.

I'd like some responses from folk who have actually had something like 
this done.  Suggestions of changing motor blocks etc are not what I am 
looking for.

And I am just fiddling around now. The Sunbeam may never run again as a 
race car..and that would no doubt please a LOT of people, lol...

mayf