Here is a pair of 3748770 heads for a 1958 Corvette with 283 engine dated September 27th and 30th, 1957. The intake and exhaust ports are stock. The rocker studs are stock pressed-in style. They have a prominent surface ledge. They have been magnafluxed OK. The 30th head has a broken exhaust manifold bolt. I have other dated parts, let me know what you are looking for and I will see what I have that works best for your car.

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