Re: 318 Poly Valve Train Question
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Re: 318 Poly Valve Train Question



Henry,
 
Unless you have one of my “tight lash” Poly cams, you must run solid lifters with your solid lifter cam core.  Lobe design and transition ramps are different for a Hyd. Poly Cam and best to stay with what you have to save money.
 
Yes, the “Cool” Poly will look and run better than the LA 318.
 
Let me know if I can help you further or email me at glpavlovich@xxxxxxx with any detailed information not pertinent to the overall Mail List discussion interest.
Gary P.
 
Sent: Sunday, October 08, 2017 11:17 PM
Subject: Re: 318 Poly Valve Train Question
 
Gary,
 
Thanks for the response!  This is great information.  The engine I have is a 66 block and contains solid lifters.  Some folks have suggested that I replace the lifters with hydraulics from a later LA design.  I'm all for less maintenance, but my concern is that the existing cam is designed for solid lifters, and that one for hydraulics would be different.
 
This project is designed to be a "quick" cleanup (as if that ever happens) of a "recently rebuilt" Poly allegedly with about 20k miles on it that was pulled and stored for 10 years or so.  The engine had a bent exhaust push rod on the No 8 cylinder, which is likely why they pulled the motor.  The cause appeared to be a water leak via the intake manifold  causing hydraulic valve lockup.  The rest of the motor looks consistent with the story as told,  as does the fact that it came with new heads.
 
Further complicating the story, and crushing collector value, is that the W500 obviously orginally came with the 251 flathead engine thread offered in that year only.  Some prior owner was apparently a skilled stick welder, and fabricated and welded  to the frame engine mounts for the later 318 LA.  This ran fine, but had a minor fire on my watch, and I happened into the Poly, which is "correct" for the truck and looks cool.  Sic transit Gloria....
 
Any thoughts appreciated.
 
Thanks again!
 
H
 
On Oct 8, 2017 8:33 PM, <glpavlovich@xxxxxxx> wrote:
Hank,
 
The heads with adjustable rocker arms are used with solid lifter cam Poly engines and the non-adjustable heads are factory head for the Hydraulic Poly Cam engines.  Most, if not all, of the “heavy duty” truck models (ie your W500) came with Hyd. cams and non-adjustable rocker heads. 
 
Many of the Canadian Poly psgr. car engines and trucks came with non-adjustable rocker assemblies and Hyd. camshafts from the factory; ie like the Canadian 1967 Plymouth VIP of Kevin Merkley.
And here we have another twist in that 318 Poly psgr. car engines were limited to the 1966 model year in the U.S. (with some 1967 heavy duty trucks and TRAVCO motor homes still built with Polys in the U.S. just to confuse some parts people and unsuspecting Poly owners) but continued through the 1967 model year in Canada. 
 
The first and only 318 Poly passenger car to receive a Hyd. Camshaft and non-adjustable rocker gear was the 1959 Dodge...which was an overbored 318 Plymouth Poly topping out at 326 cubic inches. All following model year Dodges were installed with the standard 318 throughout the Poly production run.
 
It is always good to use the adjustable rocker assembly with Poly Hyd. cam motors (ease of maintenance & ability to set proper lifter pre-load...) and mandatory of course with solid lifter motors.
No such animal as adjustable pushrod Poly engines.
 
Gary Pavlovich
 
 
Sent: Sunday, October 08, 2017 6:33 PM
Subject: 318 Poly Valve Train Question
 
Hello!

New poster, longtime lurker.  I am from the Power Wagon side of things, I have 3 trucks, a 1956 flatfender, a 1961 2 ton (W500), and a 1964 W200.  I am working on assembling a 318 Poly for the W500.  The engine that I have came with two sets of heads: one had adjustable rocker arms, the other doesn't.  I have heard a lot of explanations for this, including adjustable push rods, and the rare long lost Canadian hydraulic lifter model of the 318 Poly.  My intention is to reassemble with the adjustable rocker arms, but can anybody tell me where these non-adjustable rocker arms came from?

Thanks!

Hank
Occasional poster on www.dodgepowerwagon.com
1956 C4W126 - 230 Flathead
1961 W500 - 318 LA -> 318 Poly
1964 W200 - 225 Slant 6
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