Cam Swap

[Don.F.Broadus at ucm.com]

Degreeing the cam wouldn't hurt even if the cam regrinder did get it right
on , your new timing chain sprockets could be off , I don't know if the V6
crank keyway was positioned in the retard position as it is rumored some V8s
were this way from the factory. The single pattern cam you put in might not
pull the exhaust like the original dual pattern cam with more exhaust
duration did. Uncorking the exhaust should let the single pattern cam work
at higher RPM.
 
Don 

> -----Original Message-----
> From:	David A. Cooley [SMTP:n5xmt at bellsouth.net]
> Sent:	Wednesday, June 30, 1999 2:36 PM
> To:	gmecm at efi332.eng.ohio-state.edu
> Subject:	Re: Cam Swap
> 
> At 12:19 PM 6/30/99 -0700, you wrote:
> >I just swapped the cam out in my 94 Sonoma with a TBI 4.3 the
> >results were very unspectacular, nearly imperceptible.  I went from a
> >cam with a 110 degree centerline, 179 intake / 194 exhaust degrees
> >duration @.050 and .349 intake and .384 exhaust lift to 112 degree
> >centerline, 207 intake / 207 exhaust degrees duration @.050 and .442
> >intake and .442 exhaust lift.  A K&N filter is the only other
> >powertrain mod.  Do I need to do a VCM retune to realise benefits from
> >this cam swap or are further hardware modifications in order.  I am
> >also thinking about using a degree wheel to make sure the cam grinder
> >phased the cam properly although since it is a regrind it would be
> >nearly impossible to get the timing too far out.
> 
> if the exhaust is still stock, that could be the "cork" holding the genie
> in.  I put a set of Edelbrock TES headers on a 93 GMC Jimmy with the 4.3
> and added a 3" cat back exhaust with Walker Ultra-Flow muffler... Just
> that, a 180 thermostat and a K&N dropped it to 14.7's in the 1/4 mile.
> The
> added duration/lift of the cam won't be realized untill you open up any
> restrictions (Exhaust) then you may need to retune the chip to deliver
> more
> fuel for the added breathing.
> ===========================================================
>            David Cooley N5XMT           Internet: N5XMT at bellsouth.net
>      Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R. Member #7068
>    Sponges grow in the ocean... Wonder how deep it would be if they
> didn't?!
> ===========================================================