Hi Jon, yes I know what you mean about the 10" wide wheels, but somehow the teams managed to get them to fit with only subtle flaring. CAMS, the Australian governing body for motorsport, allowed 10" wide wheels in the Australian Touring Car Championship from 1970, and so cars that were built from late 1969 onwards, incorporated the new 10" wheel rule into their cars when building them. CAMS also stipulated that the car must maintain the standard silhouette when viewed from side-on, so much care had to be taken. All the photos you have seen of the Bob Jane 1969 ZL1 Camaro are of it fitted with 10" wide wheels. The rear wheel opening required extra sheet metal, but the front fenders were far more modest, as the front tires were smaller than the rears.
To be honest, some of the earlier cars built prior to 1970, which had wider flares grafted on to fit the new wider wheels, did look a bit awkward.
Jon you may recall me telling you about a new historic sedan racing group I'm involved with starting here in NZ. The original SCCA Trans-Am rules you posted on this site were a great help to us in putting the rules together and getting the wording right. The group is called Historic Muscle Cars, and is open to cars of over 3,000cc built prior to December 31, 1977. The rules are a mixture of what was used in New Zealand in period, SCCA Trans-Am, and Australian Improved Production, which is what the two Camaros pictured above were built to.
We decided on a maximum 10" wide wheel, based on the Aussie rules of the period, as New Zealand allowed even wider wheels at the time, and we didn't want to go that far. This is a '67 Camaro that is nearing completion for HMC. Its fitted with 9" wheels on the front, and 10" on the rear. Our rules require a maximum 6.00x15 front and 7.00x15 rear tire. Only very subtle flaring was required. This car is also fitted with Crower mechanical fuel-injection, as we allow period inlet set-ups, and several cars raced in Australia at the time with mechanical fuel-injection.
