We have 7200 miles on our 427" iron block SBC that's in the GT55. It's killer. There was a little smoke when the rings were seating, but there hasn't been a hickup with it.
We also have a 427" aluminum block SBC thats going into our 3G Vette project. With FAST/Wilson Manifolds setup it made 538hp and 517ft lbs with our headers and exhaust system. AND!!! the engine only weighs in at 355lbs.
Very happy with them and would definitely recommend their products.
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