well it is not just that the alu heads are better than
cast but the amount of reworking to the heads .. ect
bigger ports in the heads for the air to enter the
engine and leave via bigger exaust ports different
rockers to increace the duration of the cam ect......
all of these factors add up for the increce of HP and
i hope i answered you question with this
Frank
94 3.9 sport
--- N2mopars@aol.com wrote:
> In a message dated 2/3/00 8:36:31 PM Pacific
> Standard Time, Dester223@aol.com
> writes:
>
> << What would the gains to an alum. head be over a
> cast head? I think weigh
> reduction, but then alum warps faster? and the
> valve seat might wear out
> faster over time with alum.... Sorry. beginning in
> automotive stuff. still
> trying to figure out alum. VS cast iron stuff..
> -Dester
> >>
>
>
> The fact that they are cast in aluminum means
> performance to begin with.
> They probably have better port flow. Yes, they are
> lighter. Steel inserts
> are installed for the valve seats. Lower combustion
> chamber temps, can run
> higher compression ratio. All this leads to more
> power. Plus if you want to
> get them ported, its a little cheaper, cause it
> doesnt take as long to port
> aluminum haeads as it does steel.
>
> Brad
>
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