Prowler V6

[Gary Derian]

The ZZ3 and ZZ4 have cast cranks.  The ZZZ, ZZ1 and ZZ2 are forged.  I have
a new ZZZ if anyone is interested.

1969 was the first year for 4 bolt Chevy SB.  Z-28 and LT-1 only.  L82 later
also.  I have never heard of a 10,000 rpm stock Chevy.  Lots of trucks got
cast cranks with 4 bolt.  Cast iron is a very good material to build a cheap
crank with.  Cranks are stiffness limited, not strength limited at low rpm.
The high winding motors need forged cranks.  4 bolt blocks are very good for
improved bearing alignment for high engine loads even at low to moderate
rpm.  Just like trucks do.

Gary Derian <gderian at oh.verio.com>


> Todd....!! wrote:
>
> >
> > I've heard that most s.b. chev 4-bolt main blocks had forged cranks, but
> > this hasn't been sildified/proven yet to me anyways, anybody?
> >
> > I'm Just a wonderinnnnnnn fooooooooooooooo.............!!
> >
> > LATER!
> >
> > Todd....!!
> >
> Bad rumor to put any faith in.  Many 4 bolt Chevys are cast crank.
> Post 86, only steel cranks are in LT1, LT4, and ZZx series engines
> (ok, ok, smallblock, 5.7, gen II engines).  Also use powdered
> connecting rods, prone to sudden failure rather than bending, but much
> stronger until they break. ; )  Ligenfelter Perf. Engineering is
> selling some of this stuff that they pulled at low mileage to build
> some stronger engines.
>
> If you're tracking down rumors, ever hear of the 1969 4 bolt 327
> Chebbie?  Rumors are that it was a Canadian built engine.
> Shannen