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« Last post by 70_71_78 on Today at 07:33:08 AM »
I have not looked up the block codes, but there were 455 blocks with four bolt main caps that may not have been documented, therefore, few would know about. I bought a thrashed '70 455 auto Bonneville for a 455 to build back in the mid 1980's. Block and engine codes both indicated a standard low performance 4bbl 455. I drove it home and removed the engine and 400 auto trans. Sold the turbo 400, junked the body and frame after removing other usable parts. I started disassembly by removing the entire top end, nothing special there. Rolled it over and pulled the oil pan to find 4 bolt main caps and a nodular iron HO crankshaft! It did not appear that the engine had ever been removed from the car or even opened up for service for that matter. I can only assume that when being built those parts were on the shelf so they used them and assume other anomalies may also exist from that time period. A quick bore size measurement may be in order before passing on it as a builder. I couldn't have been happier with the way mine performed.