RE: IML: valves and heads

["TomC" <tcsibor@xxxxxxxxxx>]

Kenyon,

I sit on both sides of the fence that you talk about. I drive our beloved
big luxurious heavy boats and I also build engines for some of my A and B
body muscle cars.

For the Imperials, I agree 100% to the information you state below. Heads,
valve sizes, Intakes etc. make very little difference at low RPM's and in
fact can be very detrimental to torque, which is what a 5000 pound car
needs. Even higher bumps on the cam can be a negative to both torque and gas
mileage as the higher the cam overlap, the more scavenging of intake fuel
happens, which only works for high rpm applications.

Now, for a light bodied high rpm, high compression engine, all the above
factors make a significant difference. The head choices become more
important with the higher compression configuration, as the closed chamber
heads offer a much better design for avoiding detonation. Also, the magazine
articles you elude to generally are for the hard core racers who need to get
that last 1 or 2 percent out of their engines. But, human nature being what
it is, we read, salivate and want - we being the royal we here ;-)

Bottom line - for the Imperials, all things considered, I feel that stock
configuration with a quality rebuild is best.

Tom


-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of Kenyon Wills
Sent: Friday, February 22, 2008 9:15 AM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: Re: IML: valves and heads

Guys and Gals,  I had my 72 440 redone with a bump in
cam and mild compression.  This done by a guy that's
been doing RB engines for the local muscle crowd for
at least 30 years.

<SNIPPED>



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