Valve head measures 27mm, total length is 2.580" (+/- .004") Top Quality stainless steel with automotive radius type keeper groove. Fits stock 5.5mm valve guide. WILL NOT fit stock retainers. Use ARC # DJ-1047 retainers for 22/26lb springs or DJ-1046 for 36lb springs. DJ-1051 lash caps 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.
very good product