Vintage Tractor pulling

Is there a governing body for vintage tractor pulling.I cant find anything on the web.What are the rules and who makes them up ect. I have spoken to people at events but have never got the same story twice. I have a C6100 chamberlain that my son is keen to take but at 40 years old is too new to qualify. It seems a shame to me that there is no class for this type of tractor. Not every one can afford the time & or money to find restore & show a vintage or clasic tractor.

Hi FB,
The NHMA has guidlines;
www.nhma2013rally.com/docs/NHMA%20Tracto...ull%20Guidelines.pdf
Regards, Rod.

yep farmer brown we live in a world of rules which can take shine off having fun the boy might just have to wait a few years and would have thought there would be something for tractors that are newer regards Paul

Built between 1970 and 1976 ,so if the serial number is low enough it should be OK .