Product Description: When it's time to replace the Valve Guide in your engine, turn to A&I Products. Their replacementvalves are made from quality materials that are intended to produce solid, reliable, long-lastingpower. For Leyland Marshall engines: 3.4T, 3.4TD, 3.8, 3.8T, 3.8TA, 3.8TD. Fits Leyland Marshalltractor models: 4DM, 344, 384, 4/60, 10/60 and 4/65.