These spacers are made out of strong aircraft quality aluminum alloy 6061 and machined flat on both sides. Adding these spacers is the simplest way of getting that extra couple m.p.h.. These spacers go between the transom and the engine’s mounting bracket or they can also be installed between the jack plate and engine.
If you think you need longer bolts, please visit our bolt kit page: https://www.vancemfg.com/category-s/163.htm
By applying the set back spacers to the transom, you are moving the center of gravity of the hull further back. By doing this you are re-balancing the boat which allows the hull to remain at its present attitude with less trim. Therefore, you have more power to push the boat forward rather than to hold the bow up.The 4 inch setback spacer model has a maximum HP of 150 and below. All other models are unlimited HP.Weights:5/8'' - 4.7 Pounds3/4'' - 5.0 Pounds1'' - 8.0 Pounds2'' - 12.0 Pounds4'' - 10.0 Pounds