This valve head measures 25mm and are top quality. It has a radius-type keeper groove. This Valve will not work with stock retainers. Will fit stock 5.5mm valve guides. Use ARC# DJ-1047 retainers for 22 or 26lb springs, or DJ-1046 retainers for 36lb spring. DJ-1051 lash cap are recommend.
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I use this valve in a stock Kohler CH270 head with unmodified valve seats. This valve works well and I have spun my engine to 8500 RPM multiple times while in a draft with no issues. Have and will buy again.
Now these are the only valves that I'm going to use from now on I will use these before factory these were made to fit