Here’s the link to the cylinder head test. John’s heads are the ones making 288HP & 336 ft/lbs Torque.
http://www.y-blocksforever.com/forums/Topic61587-3-1.aspx
Because the intake side of the heads were also milled, intake manifold fit is not a problem.
Email me direct, feistritzer1[at]msn[dot]com or call 765-282-1067. I may hve said I'm 45 minutes from Dayton, actually it's 45 min. to the airport.
No problem, you say you are interested, so they are not for sale to anyone else until you make your decision.