Oh, now reading the responses...all I can say is "you don't understand the cooling system, you are making a bigger mistake."
It's not difficult to get a 300HP L28 that will run in desert heat all day long under track conditions in the summer (willow springs big track, or Streets Course)
If you can't figure that out, don't lecture anybody pointing out the flaws in your stayed logic.
Just on the basis of that response, I'd vote to shed this post and say "try again"... I don't agree with NewZed on much, but he's spot on in his statement, and your response was bot childish and uncalled for in return.
If you want more power, just say so. Don't use the excuse of "we lost the engines to heat"--that is your failing, nobody else's! Keeping a high output L28 Cool in SoCal is not rocket science. You're asking for more issues without solving your (stated) root cause problem first.