Re: 440 help

[roger@xxxxxxxxxxxxxxxxx]

Why such low compression.  Very interesting.  Just for cheap pump gas cause the motor home did 6 mile to the gal?



------Original Message------
From: SB
To: 1962to1965mopars@xxxxxxxxxx
ReplyTo: 1962to1965mopars@xxxxxxxxxx
Sent: Mar 24, 2009 7:17 AM
Subject: RE: 440 help


They also have windage trays and double roller timing chains.


SB wrote:
> 
> I have disassembled, and rebuilt, a number of 1970's vintage 440 
> motorhome engines, and can attest to the following (based on my personal 
> experience, which doesn't make the following absolute):
> 
> 1.  They all use the same pistons as the same year 440 car engines.  413 
> motorhome engines use unique, dished pistons in the 7.0:1 compression 
> range, but not the 440 motorhome engines.
> 2.  The blocks on these engines are machined slightly differently, and 
> hold more anti-freeze than the same year 440 car engines.
> 3.  These engines seem to be devoid of most polution controls.  For 
> example, I had an intake manifold and carb from a 1978 version that was 
> clean.  No EGR, no air pump nonsense, etc.  The Thermoquad carbs are 
> free of polution controls and Lean Burn nonsense, and even have a ported 
> vacuum advance line.  If you know Thermoquads, that is pretty rare.
> 4.  Now, the best part.  440 motorhome engines use the best factory 
> heads you could ask for, save the Max Wedge heads.  If your engine is a 
> 1973, it probably has 213 heads on it (if I remember the casting number 
> correctly), which are motorhome versions of the 346 head.  They flow at 
> least on par with the car heads, and run cooler.  Later 452 motorhome 
> heads are, in my opinion, the gold standard of big block heads.  Fastest 
> way to check if you've got real good ones--if the heads use "peanut" 
> style, little spark plugs, you've got a real winner.  RV12YC, I think.
> 
> Bottom line: Your 1973 motorhome 440 is superior to a 1973 440 car 
> engine in many respects, and equal to it in all the rest.  My friends 
> and I hunt these things down.


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Please address private mail -- mail of interest to only one person -- directly to that person.  I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic.  Thanks!

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