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It made 538 HP 
That gives me a good idea how Koffel's dyno compares to the two I've used previously.
Me too. My car weighs 3320 (500 lbs more) and traps the same, and I know it doesnt make even close to 540... when it would need to make more than that...
All that said, its just a tool for comparison, and it sounds like you made some major gains on alky, very cool 
11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.
9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.
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