Reher-Morrison Racing Engines' David Reher and Darin Morgan answer your questions about cylinder heads or anything else concerning your racing engine building problems. Remember who you're are dealing with so no soft-ball questions.
Tim and Sam,
Your heads could have been milled down to reduce the chamber volume which is not a bad idea but they may very well have been milled to much. If you are not familiar with the heads and dont know there history, you should take them to an engine builder and have him inspected. If the heads have been milled properly and the milling has resulted in the manifold sitting to high, its not a big deal. I see this all the time. Take the manifold to an engine builder in your area and have him mill it so it fits. Make sure to measure your end rail clearance prior to machining. If you machine the intake flanges it will reduce the clearance on the end rails so you may end up machining that as well. If you are unsure of the procedure, take the heads and intake to an engine builder and have him mock them up on a block. He then has an exact measurement to go by and this will insure a perfect fit after machining. Other wise you will end up running back and forth from your garage to the engine builder.
David Reher asked Darin Morgan to answer this question because it is his area of expertise.
Reher-Morrison Racing Engines
1120 Enterprise Place
Arlington Texas 76001
Visit our web site at http://www.rehermorrison.com