[ChrisL]

While we are on the subject of Ford v Chev, may I digress just a little. The major racing category on the local scene has Ford up against GM. The only engines permitted are the 5L Ford and the 5L Chev engines. It had recently been accepted however within the category that the Chev SB engines could never be made to produce the same amount of horsepower as the Ford SB engines, so the rules were changed to allow special "motorsport" heads (non siamesed ports) to be developed to allow the competition to continue on a level playing field. Given that this advantage is now a "documented fact", how did history decide that the Chev SB motor was to become the more popular engine of the two in motorsport?

NB. This category is very tightly controlled and limits the engine revs to 7000RPM. Both engines produce around 650HP and it is said that the Ford engine was capable of producing about 20HP more than the Chev.