[olddog]

As said earlier there were 427 center oilers and side oilers. The 427 side oiler was the best performance engine that ford sold. It was also the highest cost. It is also the most sought after today.

Shelby dropped 428 engines in the Street version of the Cobra, because it was cheaper. Rumor has it there was legal action taken against him and he stopped doing it.

So a straight answer to your question. The 427 is worth more, especially true if it is a side oiler.

You may have a 427 center oiler.