Pontiac Firebird SD-455 Engine - New-Age Super Duty
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The cylinder-boring operation is accomplished with a machine called a boring bar. A tool bit attached to a rotating cutter-head enlarges the cylinder diameter to fit a new, larger piston. Most boring-bar machines attach to and reference off the block-deck surface. So if the deck isn't made perfect, the boring operation will be crooked as it was with our engine. A shop such as RaceKrafters that specializes in high-performance engine building has a machine that centers off the main bearing saddles, a more accurate fixturing location. View Related Article
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