Promedia Publishing this week released the much-anticipated preliminary set of rules for most categories in both the NMCA and NMRA this week, giving racers and fans alike a look at what to expect in 2011. Currently, the tentative rules for all but the NMRA’s headliner class of Pro Outlaw 10.5 and Hot Street are available for viewing and series officials are entertaining racer concerns and suggestions before marking the seal of approval so as to offer the most comprehensive and well-accepted rulebook for the masses. Several changes of the minor and major variety have taken place, such as turbo limitations in Super Street Outlaw and the permitting of methanol in Pro Street.

Check out the preliminary rules for the NMCA and NMRA in PDF format.

The increasing interest and popularity of 275 Drag Radial style of racing hasn’t been lost on the two series that previously haven’t contested such a category. As such, the most interesting development to come out of the release of this preliminary rule set is Promedia’s inclusion of the class in both series next season, converting the current NMRA Drag Radial category to a 275 tire format, and transforming the former NMCA Street Radial class to the same. Like all of the other categories, the final rules for these two classes are still being hashed out and should be final in the coming days, but a look through their current, tentative rule set reveals a very similar look to John Sears’ highly successful X275 guidelines.

The NMCA side of the radial coin will allow for small block and big block single power adder combinations using street-type DOT radials, with a maximum of 588 cubic inches. Cars will have to retain a stock-type suspension and weight breaks are in place for naturally-aspirated small and big blocks, single turbo, supercharged, and nitrous combos. Naturally-aspirated cars may run a 28×10.5 slick tire, while power adder cars are limited to a selection of tires from several of the leading manufacturers. Meanwhile, the NMRA’s class will limit racers to 302, 351, and 4.6L/5.4L modular engines up to 440 cubic inches, with a similar set of weight breaks and power adder allowances.