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#1
01-16-2026, 05:39 AM
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It’s really not worth dumping all that money into getting work done to a factory 455 crank to fit 3” mains.
Just get a new 4.210” stroke crank with the needed 3” mains. You can get pistons to work compression wise with either of those casting number heads. The 6X heads have a better intake port then the 16 heads and even though they only have a 1.66” exh valve it’s been shown ( at least in a 455 ) make more power up to 5400 rpm , which is fine for general street and street strip usage. Either way you do go head wise be sure to get new valves.
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