First off, what size (mm) are the stock intake and exhaust valves. Second, when installing 1mm oversized valves in the head, what needs to be replaced? Valve seats? Guides? Or is it just machine work?

bump

It is just machine work, redoing the seats to seal against the bigger valves. The shaft on the valves is the same size. I don't have the sizes committed to memory and am at work so I can't look up stock diameters.

One who displays himself does not shine.
One who justifies himself has no glory.
One who boasts of his own ability has no merit.
One who parades his own success will not endure.
- Lao Tzu

valve head diameter
-----------------------
intake 34.67-34.93mm
exhaust 30.37-30.63mm

valve stem diameter
--------------------------
intake 5.934-5.952mm
exhaust 5.906-5.924mm

Juggalo- nice avatar!

Who makes oversized valves for the 420a?

Blackdog - http://www.blackdogmotorsports.com/cylinderheads.html


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