Head porting

 

Modifying the cylinder head on an A-series is fairly straightforward and well documented, since people have been doing it for more than 60 years. I happened to have a copy of David Vizard’s “Tuning BLs A-Series Engine” lying around, so that’s the guide I used.

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Tungsten carbide cutters in a die grinder make short work of shaping the cast iron head. Grinding wheels are for sissies.

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Once the basic porting and combustion chamber shaping was done, the head was sent back to the engine rebuilders to have the new unleaded valve seats and valve guides installed.

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