Bill,
There are a whole range of counterweights for different years.
Your best bet is the nearest Mazda engine rebuilder - they usually carry a
lot of different 2nd hand parts.
George ( down under)

> At 12:32 PM 5/31/2005, you wrote:
> >Is the 4 port from the automatic and the 6 port from the 6 speed manual?
> >Jeff
>
>          The 6 port is rated at 247 HP, 159 ft-lb peak torque, 9000 RPM
> max. The 4 port is rated 207 HP, 164 ft-lb peak torque, 7500 RPM max.
>
>          The automatic transmission won't stand for the 9000 RPM, so the
> six port is only available with a manual transmission.
>
>
> >Tracy Crook wrote:
> >>Yep, that was a big factor in why I chose the 4 port "low power"
> >>engine.  Much simpler manifold requirements.
>
>          Six runners will, indeed, be a challenge.
>
>
>          Did your RX-8 counterweight look any different from and RX-7
> counterweight? How can I tell the difference? I bought a counterweight,
and
> I want to know some way to make sure it is the correct one for my engine.
>
>          What does the RX-7 counterweight weigh?
>
>          Thanks in advance,
>
>          Bill Dube'
>
>
>
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