Highflow Stainless Steel EV16 (21-8N), Hardened Tip (52 HRC), 33mm exhaust valve, 7mm stem necked down to 6.5mm, 90.95mm overall length, For Hyd lifter 1.8L 8v, ABA, Audi 10v, V6 2.8L 12v heads. Higher flow than std. valve. Black nitride treatment reduces friction, improves heat dissipation and Valve guide wear. (To convert 8mm head to 7mm. Parts needed 109 222 exhaust valve guide, 109 290 7mm keepers, 109 085 (109 136 Titanium) upper retainers, 109 322 exhaust seals) 109110S
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