The Intake valve has a +0.5mm oversize head made from high nickel alloy 21-4n material, deep stem undercut for higher flow rate, fully machined, swirl polished, close tolerance stem, QPQ black nitride finish provides higher surface harness with low friction for improved stem wear. Valve seat surface is harder with the nitride layer, resisting corrosion buildup and lasting longer with lead free fuels, alcohols, nitro or other "explosive" mixes. Backcut for improved flow.
On Sale now!