Thanks for replying, I'm just getting the design ideas on paper. The class is a basic Microstock, very similar to the slingshot w/ no suspension. It to is based on a dirt modified w/ driver in the middle. Our cars can only go to 8' in length, motor in the rear, single cylinder engine. We have 26" from the rear axle to the rear bumper to get an engine in as of now. This is why I'm asking before we finish up the rule book...Our engine package has no limit on cc, but it is starting out as a stocker type on gas very similar to the mini cups. If the proper set up can be found performance parts would not be a problem in the future for various engines.....The basic microstock uses all go kart parts, but we are upgrading ours to use mini cup wheels & tires.... Thanks for the time.....David