On Sun, April 1, 2007 4:16 pm, Bernd D. Ratsch wrote:
>
> I don't have any hard numbers from a before and after, but I have
> extensive head work on my 3.9L and it made a world of difference with
> the cam selection. For the stock cam though, there is no need for
> polishing work unless you plan on running either a supercharger or
> alcohol/nitro. You actually want some "tumbling" in the intake
> portion. On the exhaust side...go ahead and polish them if you want.
> Best place to actually polish the heads is in the combustion chamber -
> it control detonation (removes hot spots from high/low casting flash
> spots).
Do you have any experience with the Singh grooves?
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