Exhaust Valve Guide Replacer P/N 4912 Nevitt Aircraft Inc. » Products Page » Product Category » Aircraft Tools » Exhaust Valve Guide Replacer P/N 4912 Exhaust Valve Guide Replacer, Part # 4912 Price: $0.00 Shipping:$0.00 Updating cart... By Dallas Flora | August 10, 2012 | ← Exhaust Valve Guide Replacer P/N J-4945 Test Box →