This engine was called the "O Forty Five" as it was .045 cubic inch displacement.

The day before, the Indiana Trophy Race was held for smaller cars (those with engines of less than 300 cubic inch displacement).

Equipped with dual four barrel carburetors, the engine developed one horsepower per cubic inch displacement.

The engine designation means horizontally opposed 63 cubic inch displacement.

Optional engine choices were the 361 cubic inch displacement D-500 and Super D-500 iterations.

Cubic capacity was 4169 cc (254.39 cubic inch displacement).

The 1956 Fireflite had more stroke, 3.80 for 3.30 cubic inch displacement.

It was powered by a Chevrolet V-8 engine with a 283 cubic inch displacement.

It was designed with potential for a 500-cubic inch displacement.

The race was a four lap (10 miles) affair for stock chassis with engines of 301 to 450 cubic inch displacement.