Wow... it worked. It actually worked and worked well! 495hp @5600 rpm and 505 ft lb torque @4300 rpm. All in all, it tested great. Good compression, great oil pressure, runs cool, clean oil, and sounds beautiful. We had to bump the rev limiter up on the MaxFire to get it to run clean @6000rpm, and we also shimmed the valve springs to get the right strength (150lb closed, 360lb @.50" lift) -- they were the right springs, they just need a little squeeze. They also tweaked the Quick Fuel 750cfm carb and messed with the timing, ending with 30 degrees of timing.
The bad news, cylinders 2 and 3 stuck out like sore thumbs on the leak-down test. Average leak-down was about 15%. Cylinders 2 and 3 were at 70%, and you can hear the leak in the exhaust port. Dang! I gambled on the pre-assembled heads and lost. Let me pass along the advice I ignored: at the very least have your valves seats checked, even if they're pre-assembled. So now I have to pull the heads and have the seats corrected. Shouldn't be a big deal -- I just wish it was completed.
Check this out...
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