There were earlier questions about rules in the 1/8 GT class, so far I see at most major events, as follows:
Engine - .21, .25 or .28, 5 port sleeve, max carb. 7mm
Dry weight minimum - 3500 grams
Max fuel capacity - 150cc
Tires - rubber.
If there are any concerns, please let Chris know. If need be, or by request, G.L.A.R.C.R.C. will provide equipment for tech. May be a good idea?, just my 2 cents!
G.W.