Up for sale are the original casting patterns designed and made by the famous OZ Chevy 6 cylinder innovator Frank Duggan. These patterns are still in great shape and are for the Legendary 12 Port Chevy aluminum cylinder head he also designed and made. Many of these heads were used here in the US in Midget racing, so plenty of market to make and sell these. A copy of these patterns were also used by the famous US Chevy 6 cylinder guru Kay Sissell, and will also fit both the Duggan and Sissell cylinder heads as well. The picture of the 4 cylinder version shown is what these will look like when cast, just with 2 more ports. These 6 cylinder intakes sell for $600 when finish machined, so a great profit margin and awesome niche market no on else can do, you will be the only supplier. Shipping will be around $50. Its big and heavy! Thanks!