Prowler V6

[Gary Derian]

Basically the solid lifter engines also got forged pistons and cranks.  I
think the Z-28 and LT-1 L-88, L-89 also had the cranks tufftrided.  It was
similar to nitriding, very thin surface hardness, and is used to improve the
fatigue strength.  The bearing surface does not have to be very hard, just
finely polished.

Gary Derian <gderian at oh.verio.com>


> Ross Corrigan wrote:
>
> > >Also, there was a 68 or 69 large journal 307 or 327 offered with
> > >forged crank, tho I don't remember the details.  Just remember going
> >
> > Line I've been fed is the 300+ (not 300, only above) hp 327's got forged
> > cranks in the large journal setups.  Read this more than once now in the
> > chevy mags. Rest large journals were cast.  My serial # matches a 325hp
> > version but I didn't know enough when I did my quick re and re to check
> > that part out to verify.  This is only for 327's.
>
> Found a casting# site. This shows forged, 325hp, 69 327.
> http://www.mortec.com/
>
>
>
> In a mild street motor, ya get bragging rights.  Some GM cranks had
> hardened journals, but I don't know which, if any, were factory
> installed.  Hardening was not too deep.  Machinists tell me that a
> regrind usually removed it, and finding a less than pristine used
> treated crank is no better than a non treated one.
> Shannen