Legal engine mods for Pro Production?

[atvtrailrider]

What are the legal engine mods for GNCC Pro production? Are they not limited to 450cc? Are the rules different for GNC VS GNCC?

[BSTURDIVANT]

Anything, as long as it still fits in stock engine cases, any size, any carb etc.

[crap-banshee32]

Originally posted by BSTURDIVANT
Anything, as long as it still fits in stock engine cases, any size, any carb etc.

yup^

[atvtrailrider]

Well where does the 450cc limit apply then?

[popo]

Originally posted by atvtrailrider
Well where does the 450cc limit apply then?

There is no 450 limit in GNCC. Many racers punch them up to a 470 500 520 etc.

I think but not sure if there is a limit in GNC mx racing? some body correct me if I am wrong.

[AZblaster44]

You are correct POPO the limit for pro production in GNC is 450..

[tprender]

You will find that XC and MX racing are different so there will be different rules and classes for each.
The limit for MX is 450 and Xc has no limit. There is also some differences on the frame also.