Andrew, those cranks were still CAST steel, not forged though. Forged retains a lot more strength due to hammering the grain structure of the steel more densely. On September 24, 2004 andrew hay wrote: > that's the way it is -now-, but i don't think it was always true. in > particular, i think it was some development in mass production casting > that made iron cranks practical in the '60s. remember, molten steel > is much more 'runny' than iron. that would make casting an odd shape > like a crank much easier. > > blocks are easier; you can make a block plenty heavy to cope with > less-than-perfect casting. you can't make a crank heavier; the stress > would get -worse-. > > mopar wouldn't have designed their famous slant six with a steel > crank if they didn't have to - and they spent the money to convert it > to cast in the '70s, which involved bigger main journals. and the > chevy 194 and 230 had a steel crank but the 250 didn't. > ________________________________________________________________________ > Andrew Hay the genius nature > internet rambler is to see what all have seen > > adh@xxxxxxxxxxxxxxxxx and think what none thought ============================================================= Posted by wixList Archiver -- http://www.amxfiles.com/wixlist