Help or info on heads

[Martyn]

Hi all looking for some help / info. I am building a new engine for autograss there is only certain bits we can do to the engines I believe a 18 b head is the way forward whether I'm right or wrong it would be great to know?i have had all relevant balancing etc new rings shells bla bla bla I have got a 31 b head with 3 anfGle valves but only on inlet not exhaust is ther any other tips I can use or if any one has any good bits maybe cheers in advance