Quick view Add to Cart Supplement to Basic Technical Order; Application of Special Lubricant on Cylinder Exhaust Port Studs and Nuts for All Reciprocating Engines Document Part Number: T.O. No. 2R-1-511A Number of pages: 2Part Number: T.O. No. 2R-1-511ARevision Date: 11-Feb-1957 MSRP: Was: Now: $15.00