Engine Overhaul Kit Fits Allis Chalmers Tractors Fits: Allis Chalmers Fits: WD45, D17, 170, 175 4-cyl. gas Replaces PNs: Allis Chalmers 284361, 277290 Specifications 4.125" overbore, aluminum concave head pistons All JJAgParts items have been hand selected by our team and are continuously monitored for Quality. Should a craftsmanship or fitment concern be identified, JJAgParts will work with you to stand behind our products. JJAgParts is an American owned and operated family business! Here at JJAgParts, we strive for customer satisfaction. If you are not satisfied with your order, please contact us so we can make it right. Note: OEM Part Numbers are for reference only and should be verified before purchase.