Quote:
Originally Posted by tom s
valve shrouding.Tom
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The valves need to have an area completely around the intake valve to have FULL intake flow capability with the fixed bore diameter of some blocks. You could bore the crap out of the block (if the walls allowed it), (they will not), and not need the intake bore chamfers.
The valve diameter/valve angle is one concern with valve to piston and valve to block interference. Low lifts on the cam, not a real problem. Smaller valve diameter like the 1.96 diameter valves, not an issue. 2.11" and 2.15 inch valves and maybe the valve is MAYBE too close to the block. It depends on the camshaft lift and duration and the combination of parts..
A edge of the valve diameter is the closest it comes to the edge of the block in one area. But the flow has to get around that restricted opening therefore the valve chamfers are sometimes needed. Hope this helps. Stock builds probably no issues as
the factory offered some engines with no mods to the block for chamfers.
Tom V.