DM 500 Symmetrical Port Big Block Chevy Heads with as cast ports. (Price per pair BARE)
DM 500 Symmetrical Port Big Block Chevy Heads with as cast ports. (Price per pair BARE)
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The CID DM500 Big Block Chevy Cylinder Heads flow an impressive 470+ CFM from as cast ports! 
This allows us to offer serious performance from an affordable cylinder head and intake package. These symmetrical port BB Chevy cylinder heads no longer have left and right unequal length runners. We straightened up the valve angles to move away from the factory bath tub chambers and to a smaller more efficient combustion chamber. In order to facilitate this, the valve angle has been stood up to 9.5 degrees. We added 0.750‚ thick decks. Valve train stability was also a priority so the rocker gear posts are robust enough for the most demanding applications. Everything you would come to expect from the experience gained manufacturing and developing the world renowned 3V Cleveland heads and intakes. 
The As Cast DM500 cylinder head is a creation of Darin Morgan from Reher Morrison. It is designed to work on a 4.6" + bore and utilizes a 2.4" Intake valve, with a 1.850" Exhaust valve. The intake port flows 427FM at .600" lift and over 470CFM at 1" lift. The cylinder heads have their own matching intake manifold, also courtesy of Darin Morgan pictured below. 
Their unique valve angles mean these heads require their own piston configuration. Pistons are available from CP, Ross and Diamond pistons. For those wishing to use another brand we can send CAD files or chamber molds to your preferred supplier.Chamber volume for this cylinder head is right around 60ccs.
