Yesterday was April 26th, AKA Hemi Day due to the designation of Mopar’s famous 426 cubic inch V8 engine. But today, one more cubic inch means a special day dedicated to two of the most impressive engines by the other two Detroit muscle car makers. Arguably the greatest engines that either company ever produced, the 427 cubic inch engine was an extremely successful displacement for both Chevrolet and Ford on the street and on the track. The Significance Of The 427 Engine For Both Ford And ChevroletChevrolet introduced its first 427 engine in the 1963 Impala Sport Coupe as a special edition Reg…