Thanks for all you're comments.
Both my shees have 12 front and 41 rear (the stock setup)
The one I'm looking to make quicker is piped, ported, heads milled, etc etc etc.,
but the other day I was looking at my wifes new stock one and noticed we were both running the same configuration. I pretty much only run in the sand, should I go to a 13 or 14 or what? Thanks for your advise.