This manifold may be correct for some BBCs in the 65-74 range but will NOT fit the 73-74 454. They are physically thicker than the original and have different angles off the side of the head and the exhaust side o/p of the 674-506 are at a completely different angle that the exhaust pipe does not match. I would exercise caution before anyone orders these to replace the BBC in the timeframe stated. And to top it off, I didn't get around to attempting the install until I got back out the window. Now I am told that I must eat the cost of the product.
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