So the clever men at HM found you could fool the P&G displacement checker by drilling a metered hole through the lower exhaust manifold bolt hole to the combustion chamber, then drill the end of the bolt about 3/4 of the way, and drilling another bleed hole in it.
On the way to tech before or after a race, someone would loosen the lower bolts up a little, and just the right amount of air would show the 427 to be a 396. They were very good at this, since all bearings were measured installed with an air gauge
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