RARE INTAKE MANIFOLD

QuickBpBp said
When you deck the block you are shrinking the angle surface on the bottom port side of head. Therefore the intake can't sit down where it needs to be. It's simple geometry. IMO The correct way is to the cut the intake port side of head to get the correct angle and you can run any stock manifold with-out issue or leaking oil or sucking oil in the cylinder. If it's cut really hard there is more to be done as the front and back rails become an issue also.. Hope that makes sense...

Not really...? Let me restate my observation and see if that is what yours is: When you (zero) deck a block you true up the deck height to the crank centerline, maintaining the 90 degrees to it, making it completely 90 to the crank CL ...and then you do the other side. You dont take more out the 'bottom' than the top, 'shrinking the angle surface'..that would cause the head bolts not to align! When both sides are square, they are 90 to each other too, pull .125 off each cylinder bank and your still 90 to each other, and the intake angle is still xx degrees...what it was! No need to correct it, you just fly cut it across to make it more narrow, but still xx degrees. Only now its closer but it still is parallel to the original xx angle. Its simply a matter of using a thicker intake gasket or a spacer if its beyond what a gasket could fill. @SGBARRACUDA were your Stage VI spacers milled at an angle or were they just flat stock? Maybe its just how I read that, maybe were on the same page?