RE: IML: valves and heads

[sosmi@xxxxxxxxxxx]

All this proves is, those Chrysler guys did a pretty good job of matching engines to the proper use. And without compromises, gains are few. Dave.

 

-------------- Original message --------------
From: "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 G als, 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.
>
>
>
>
>
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