Turbo Chubby parts

[Bruce]

From: "Greg Hermann" <bearbvd at mindspring.com>
Subject: Turbo Chubby parts
> >If anyone has insight on some
> >combustion chamber designs for a twin turbo smallblock chevy, I'm
> >beginning the parts-buying process for the new engine soon.  Now back to
> >your regularly scheduled bickering...
> >Andris Skulte

> I would suggest using heads with "heart" shaped chambers with the plugs
> angled toward the exhaust valves, and setting the squish/quench clearance
> as tight as you dare. Aluminium heads will generally allow almost a full
> point more compression for a given fuel quality/;boost level without
> getting into detonation. Forged 4032 alloy (the lower expansion one
> compared to 2018) pistons are a good way to go. Internal coatings,
> particularly on the piston crowns,  are helpful.
> Greg

And, spend some time smoothing out the chambers, and the edges where the
chambers meet the headgasket surface.   I routinely run 2-3 more PSI of
boost then equal engines, on pump gas, and I'd imagine even more on some
sweet smelling fuel.   Also, I consider WI done right as a must.
Bruce

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