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When you have sewer-sized ports capped with manhole covers, the geometry has to change in order to bolt onto a Pontiac-style block. To that end, offset intake rockers and lifters are required. Note the difference between the intake rocker (.450-.500 offset) and lifter (offset .180-.200) on the left and the exhaust rocker and lifter, which have has zero offset on the right.
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When you have sewer-sized ports capped with manhole covers, the geometry has to change in order to bolt onto a Pontiac-style block. To that end, offset intake rockers and lifters are required. Note the difference between the intake rocker (.450-.500 offset) and lifter (offset .180-.200) on the left and the exhaust rocker and lifter, which have has zero offset on the right.  View Related Article

 

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