Vortec L31 cylinder head
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==Valve guide boss== | ==Valve guide boss== | ||
| − | [[File:900 guide boss1.jpg|thumb|450px|left|Stock Vortec boss is 0. | + | [[File:900 guide boss1.jpg|thumb|450px|left|Stock Vortec boss is 0.845"OD]] |
For performance use, often the guide boss will be shortened to allow more lift without retainer to seal clearance problems. Along with that, the guide boss OD can be machined down from 0.845" to a smaller common diameter, like .785" of the original Gen1 SBC heads, so aftermarket springs (double or with dampers) can be used. At the same time the boss can be machined from .555" to use a commonly available positive seal like 0.530". | For performance use, often the guide boss will be shortened to allow more lift without retainer to seal clearance problems. Along with that, the guide boss OD can be machined down from 0.845" to a smaller common diameter, like .785" of the original Gen1 SBC heads, so aftermarket springs (double or with dampers) can be used. At the same time the boss can be machined from .555" to use a commonly available positive seal like 0.530". | ||
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