Turning a 1955 Chevy Into a Modern Hotrod - No Jive For Your '55
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Most gearheads are familiar with the '60s/'70s BBC head castings. When a BBC head displays "HIGH-PERF," it'll have rectangular ports, while castings with the "PASS" designation will have oval ports. The 990 castings (like this one fresh off the Rat) were equipped on the hundreds of 454 crate motors sold back in the 1970s and 1980s. View Related Article
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