V6 Vortec to V8 Vortec Conversion

[Len Sabatine]

        The ZZ3 shaft in an LT1 is indeed a good choice. A Vortec 350 Truck
         Engine and PCM are different in how they'll respond to 050 cam 
duration.
         Depends on how everything is prepared and the overall combination.
         Compare apples to apples rather than  to tomatoes.
          Len

> > From: Len Sabatine [mailto:sabatine at epix.net]
> > Subject: Re: V6 Vortec to V8 Vortec Conversion
> >
> >      While the PC Dyno program may be giving some cool gross
> > HP numbers ,
> >      I would be looking at the shape of the torque curve more
> > closely ,
> > especially
> >      with an OBD2 PCM. Overall , a LT1 F-Y Body production
> > cam w 1.6 rockers
> >      will drive better and be easier to get up and running.
>
>The ZZ3 cam in my LT1 runs wonderfully, even in a 4200 lb car with the stock
>low-stall TC.  I'd use it over the stock LT1 cam any day, because I think it
>offers a power advantage without adding tuning difficulties or a loss of
>low-end.  The Crane/GM '845 cam is also a very good choice; probably better
>than the ZZ3 for Vortec or LT1 engines.
>
>The LT4 HOT cam is fairly large for a 350, and will present some minor
>tuning issues.  It's also too large for 3.08 rear-end gears, in my opinion.
>Impala guys are running them in 350 LT1s and getting great results (even in
>those heavy boats), but it takes a fairly loose convertor (not an issue with
>a manual, of course) and some low rear-end gears (3.73 or 4.10)to take
>advantage of it.  Of course, it takes some revs to make power, too, and so
>the bottom end better be capable of going over 6k on a regular basis.  If
>one has an aversion to spinning the motor that fast, take a step back to the
>ZZ3 or '845.
>
>Eric Bryant
>mailto:bryante at ghsp.com
>http://www.bryantperformance.com
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