On these early heads (through 60 anyway) the valve guides are orthogonal (90*) to the valve gasket surface, so placing the head valve gasket surface down on the mill table generally gets them at the right angle.
If placing head gasket surface down you will need a set of 20* angle blocks to get things level.
You can indicate off of the original guide holes and ream for liners.
For completeness the rocker studs are about 11* from orthogonal to the head gasket surface.
For a decent engine machinist with a valve machine this is a walk in the park.
You still need to find valves (and springs) that are close to fitting.
Early engines (through 64) had an open spring height of around 1.530", 65 and later increased to 1.586" to better handle higher lift cams, along with significant head and valve changes.
Many newer performance oriented springs want an installed height around 1.600", so even higher.
Taller springs and valves will give you more flexibility but may need valve cover spacers or taller covers, also will need an adjustable rocker system.
Last edited by peters23; 12-13-2025 at 07:26 PM.
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