These Jaycee Cylinders Are Extra Long .900 Thousands Longer Than Standard Cima/Mahle Cylinders. They Are Finned Like The Others For Superior Cooling. These Are Designed For 82Mm And Larger Stroke Motors. Don'T Stack A Bunch Of Shims Under Your Cylinders Get These And Cut Them To The Exact Length Needed. We Can Machine Your Cylinders For An Additional $60.00. Please Specify Length. Machined Cylinders Are Not Returnable So Measure Carefully.