GT5 is the smallest bore class of the SCCA GT cars. Generally you can change almost everything on the car (including building a complete tube chassis) except for engine type/size (1300cc max) and wheel/tire size. GT5 cars are restricted to 13x 6 wheels and an 8x20 inch tire (slicks are of course permitted). The skys the limit on engine modification (some restrictions are spelled on on the GCR spec line for each car model) with individual port fuel injection and one carb throat per cylinder permitted. Bodies can be mostly fiberglass and sometines can be upgraded to newer models (a datsun 1200 can be upgraded to a Datsun 350Z body) but the mechanicals stay the same. This is driven mostly by manufacturer contingency support for the marque. This call appeals to me as I like to build and try out home brew solutions to expensive race only parts. These cars are very fast and handle very well when properly set up. Rear wheel drive Minis are the current cars to beat in National class racing. Thanks for the input on what cars used the aluminun housing. Jeff I will contact you promptly about the diffs.

Mike