Here is a rare opportunity for an ambitious hotrodder. Ultra rare, as in the only casting patterns in the whole world to exist rare, for both the Chevy 153 Duggan 8 port 4 cylinder and Chevy 250/292 Duggan 12 port 6 cylinder mechanical fuel injection intake manifold casting patterns and core. There are many of these cylinder heads still out there in hotrod land, but sadly most of the companion pieces such as intakes have been lost and force these cylinder heads to be stuck under workbenches or on mockup engines on engine stands to never run again. But you can save the day by filling the void in the aftermarket that exists by casting these intake manifolds yourself. Be assured you will have no competition, since there will be no one else on earth that has patterns for these engines but you. Included are (2) raw cast 4 cylinder intakes, the patterns and core for both the Duggan 8 port and 12 port cylinder heads. The core for both intakes uses the same core. These intakes sell used for $600+ for the 4 cylinder when you can ever find them, and considerably more for the 6 cylinder. Most any foundry can cast these for under $50 bucks each, so huge profit margins and a cool niche market is all yours. Once machined, these (2) 4 cylinder intake which are included almost recoups your entire investment right off the bat. These patterns will be crated instead of boxed with cardboard to insure they are protected when shipped. Shipping is extra, but you will pay actual shipping costs.