Re: Cam Interchange

[Gary Pavlovich <glpavlovich@xxxxxxx>]

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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