RE: You never know what you might find

["Gary H." <62to65mopar@xxxxxxxxxxx>]

Time flies!  Apparently these heads started in 1985:

"...the latest heads were designed to optimize combustion to enhance 
fuel economy. These so-called "swirl port" heads were introduced 
sometime during the 1985 model year, and were probably offered in 
versions for 318-2bbl, 318-4bbl, and 360 (truck) applications..." 

"A few words on condition are warranted. Sometimes, heads found on 
junkyard cars are cracked. Cracks typically form in the area between the 
valve seats as a result of engine overheating. Therefore, fleet vehicles 
which have been abused in city driving (like taxis) may not make the 
best donor vehicles for cylinder heads. Often valves in used heads are 
reusable. Check the flatness of the end of valve stems as a crude 
indication of the amount of wear on the valve. Heavy carbon deposits in 
the exhaust ports are an indication that the engine was running rich, so 
the likelihood of burned valve seats due to an excessively lean air- 
fuel mixture might be lower...."

"...The 318-2bbl heads (4323302) used from 1985 on are a swirl port 
design with a closed (heart-shaped) combustion chamber design with a 
chamber volume of between 56 and 65 cc...."

"...Cars equipped with the 302 head have a dished piston to keep the 
compression ratio from being too high. Some cars left the factory with 
nail head exhaust valves in 302 heads, others with semi-tulip exhaust 
valves, which add 0.6-0.75 cc to the chamber volume. There is an 
interesting excerpt in "Mopar Engines", page 72, describing how such a 
head was ported and made to flow as well or better than other small 
block cylinder heads. Apparently, this experimentation resulted in the 
master for today's Mopar Performance P4452758 cylinder head...."

The above is excerpted from a report about Chrysler Small Block Cylinder 
Heads linked from the '62 to '65 site's "Technical Tips and Links" Web 
page.  

Gary H.


Gary wrote:
> Yes, the 1988 318 had swirl port heads. They started in about 1987. Gary
> Bradshaw Ft. Worth, Texas
> ----- Original Message ----- 
> From: "Thomas R Hansen" <trandco1@xxxxxxxx>
> To: <1962to1965mopars@xxxxxxxxxx>
> Sent: Thursday, March 18, 2004 6:08 PM
> Subject: You never know what you might find
> 
> 
> > Today,  I walked through one of the local wrecking yards, looking for
> > stuff. I stopped to look at the 318 in a Dodge Ramcharger, and noticed
> > that it had the intake off, and had a roller lifter cam. I backed off 
> > and
> > checked the yard's ID on the side, and it was a 1988 model. Would these
> > heads be the illusive swirl ports? The yard is going to have a half off
> > sale this weekend, and I wonder if it would be worth buying them in
> > speculation?  Would these be any good on a 360? Can they be used on a
> > earlier model set up.  Tom

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b7yoMz.