[DeTomaso] Techno question: 4/7 Swap Cams for 351Cs

[Charles Engles]

Dear Gary,

         Thanks for a pragmatic summary of the actual results of 4/7 swap
cam use in the real world.

                      Warmest regards, Chuck Engles

----- Original Message ----- 
From: "GW" <gow2 at rc-tech.net>
To: "Thomas Tornblom" <Thomas.Tornblom at Hax.SE>
Cc: <MikeLDrew at aol.com>; <SOBill at aol.com>; <detomaso at realbig.com>
Sent: Sunday, July 02, 2006 8:51 AM
Subject: Re: [DeTomaso] Techno question: 4/7 Swap Cams for 351Cs


> The hot rodders have tried a 4/7 swap for years. It's nothing new. You
> can order a custom cam for the swap. Some say it makes a difference,
> others say it's smoke and mirrors. Some long time drag racers running
> dynos have seen very very small improvements in one situation and losses
> in others. It seems to complement or un-complement engines based on how
> their intakes are flowing. The general consensus has been not only is it
> trial and error, but the gains are less then noticeable and a crap shoot
> at best.
>
> Gary
> Indiana
>
>
>
> Thomas Tornblom wrote:
> > MikeLDrew at aol.com wrote:
> >> In a message dated 7/1/06 19:51:07, cengles at cox.net writes:
> >>
> >> <<         Thanks for that information.   It clarifies the lack of a
> >> "4/7 Swap Cam" for our Clevelands, since they already have it.  >>
> >>
> >>>>> Uh, no.  They don't.
> >>
> >> Bill wrote:
> >>
> >>>  When Ford changed the V8 firing order for the 351 and 5.0 engines,
> >>> they
> >> implemented the "4/7 swap."
> >>
> >>>>> He is speaking about the fact that the firing order was changed
> >>>>> sometime
> >> in the 80s on the 302 and 351W.  The earlier small-block Fords
> >> (including the 351C) utilize the older, less-efficient firing order.
> >
> > Umm, I don't think so.
> >
> > The old engines, from about 63-64, both big and small blocks, used the
> > 1-5-4-2-6-3-7-8 firing order. The Cleveland, the 351W from 1969 as
> > well as the HO 5.0 engines use the 1-3-7-2-6-5-4-8 firing order, so I
> > think you got it backwards. Or why would they change to an inferior
> > firing order?
> >
> >
> >>
> >> Or so it seems to me...
> >>
> >> Mike
> >> _______________________________________________
> >>
> >> Detomaso Forum Managed by POCA
> >>
> >> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
> >>
> >> DeTomaso mailing list
> >> DeTomaso at realbig.com
> >> http://ftl.realbig.com/mailman/listinfo/detomaso
> >>
> >
> > Thomas
> > _______________________________________________
> >
> > Detomaso Forum Managed by POCA
> >
> > Archive Search Engine Now Available at http://www.realbig.com/detomaso/
> >
> > DeTomaso mailing list
> > DeTomaso at realbig.com
> > http://ftl.realbig.com/mailman/listinfo/detomaso
> >
>
> _______________________________________________
>
> Detomaso Forum Managed by POCA
>
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
>
> DeTomaso mailing list
> DeTomaso at realbig.com
> http://ftl.realbig.com/mailman/listinfo/detomaso
>