Here are Kelly's dyno reading before and after the new head swap.
Classic Inline cylinder head results:
Run #1: Peak HP = 323@4500rpm, Peak torque=480@2750rpm.
Run #2: Peak HP = 318@4700rpm, Peak Torque = 502@2650rpm.
between the two pulls was reduce the timing retard .25 degrees/lb of boost.
USA integral log cylinder head results:
Run #1: Peak HP=283@4800rpm, Peak Torque=416@2700rpm
Run #2: Peak HP=270@4800rpm, Peak Torque=437@2575rpm.
The result on the top are from the new alluminum Classic Inline cylinder head and the bottom results are from regular US 250 head. To learn more about turbos and how well the can function on our sixes read the stickys at the top. Can you give some specs on what you have or plane on running and what your goal is? hopefully youll turn from those bent eight engines and get inline!
-curtis