Fellow Fever i read on viperalley your up comming race with Manny, please forget pump gas and run C12 or C16. Turbo cars are ok at low boost levels with pump gas but when wicked race fuel is a must. Manny stated he wants your best with no excuses so go big or lose. You can hurt your motor large by playing with pump gas, head gaskets, broken crank, spun bearings, bent rods etc been there and done that it's not pretty. With each pound of boost you are increasing the compression so play safe and win. Heffner built you a beast but you must make the beast work, remember s/c is on kill at all times but you only have to turn the boost controller clockwise. You should run the same boost or more than Manny, may the boost be with you.