the mbe heads are the aussy ones, they are very thin around the intake port,, and everyone has issues with them cracking in the bowls,, also the guy from australia doesnt want to sell them to the us anymore cause he is afraid of lawsuits

i dynoed a motor that bes had done and it was down 60hp from what they said,, dyno's are tools

everyone throws around numbers but to run fast in a/sma at about 2900lbs,, 420 inch motor,, 7.80's-7.90's would take about an honest 1000hp at 2000 ft air