Re: Cam Interchange

[Bill <Y1TopBanana73@xxxxxxxxx>]

So is the firing order still 1-8-4-3-6-5-7-2 in a poly motor? To an
unejamcated guy like me it seems that it might be different. I guess
the question to ask is why is the lobe sync different?

Bill M
65 Coronet 500 'vert

On Wed, Apr 23, 2008 at 2:26 PM, Gary Pavlovich <glpavlovich@xxxxxxx> wrote:
>
>  Bill,
>
>  The Poly cam is physically interchangeable in that the LA cam will fit
> perfectly in the Poly block and appear to match up except for the #3,4 lobes
> counting from the back of the cam (distributor end of motor); the #3,4 lobes
> on a Poly cam are together/in sync and the LA is splayed; the #1,2 lobes on
> the LA cam are together and the Poly are splayed.  Imagine what happens to
> valve train/piston timing if one were to trial start the motor; some
> unfortunate few have stories to tell.
>
>  Gary Pavlovich
>  ----- Original Message ----- From: "Bill" <Y1TopBanana73@xxxxxxxxx>
>
>  To: "62-65 Mopar List" <1962to1965mopars@xxxxxxxxxx>
>  Sent: Wednesday, April 23, 2008 10:28 AM
>  Subject: Cam Interchange
>
>
>
>
>
> > I just came across this on the crane cams website:
> >
> > "The 318 arrived in 1967, and ran through 1986. These engines were
> > often confused with the 318 ?Poly Head? engine. Cams were physically
> > interchangeable, but the lobe layout was different for the LA. The 318
> > LA was also available in 2BBL and 4BBL versions."
> >
> > Are the cams really interchangeable? I thought the Poly cams were
> > different from an LA motor?
> >
> > Bill M
> > 65 Coronet 500 'vert
> >
> >
>
>
>
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