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Its a Boss 429 Mustang. Pretty rare and expensive if it a real one. Looks to be since you have to change the firewall to make it fit, thats what Car Craft had to do to get it in there…...
No head gasket , steel O - rings.
Shock towers were modified and widened to fit the very wide motor. Mustangs did not have very wide engine bays to begin with. Firewall not altered, but additional bracing was added between the shock towers to the firewall which were located under the fenders. Also, the engine bay brace was a thicker one piece stamped steel unit compared to the base Mustangs, this car is missing this, among other factory bits and pieces.
Dad had a 69 Boss 429! Show car and was amazing! I remember the total restoration on that car, especially having to work around those heads once engine was back in car!
No head gasket , steel O - rings.
Shock towers were modified and widened to fit the very wide motor. Mustangs did not have very wide engine bays to begin with. Firewall not altered, but additional bracing was added between the shock towers to the firewall which were located under the fenders. Also, the engine bay brace was a thicker one piece stamped steel unit compared to the base Mustangs, this car is missing this, among other factory bits and pieces.
Wow... excellent! The O-rings were called Cooper Rings... some websites said they were copper but they were steel... I held one. They dropped into a groove on the block and then later the groove was in the head. Then neoprene(?) rings were used for water channels and something else for oil channels. No regular gasket. The heads had four bolts around the cylinders and rings would be crushed when torqued down. To remove the heads, you had to remove the engine for some reason.
This technology was supposedly borrowed from diesel technology. The reason for the Cooper Rings was that gaskets would blow due to the closeness between the cylinders. The engine was designed specifically to run at Nascar which meant high RPMs solid for hours with a compression ratio of 13.5 : 1