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The AFR head swap was simple, with the only major change being the need for two extra-long head bolts per side [inset] to fasten the outside row of bolts along the exhaust ports. These longer head bolts are required on many aftermarket big-block heads, and are available from AFR when you order the heads. Unlike earlier GM Gen V big-blocks, the 454 H.O.'s Gen VI block accepts all Mark IV, Gen V, and Gen VI cylinder heads without interchange issues.