These are Poly motor mounts that fit 07-13 GMT900 GM LS-equipped trucks including Silverado, Sierra, Tahoe, Yukon, Yukon XL, Suburban, Denali, and Escalade. They are a direct bolt up using factory hardware. These use a polyurethane bushing with a 9/16″ grade 5 bolt to allow the engine and frame to rotate relative to each other reducing vibration and loading. These are laser cut 3/16″ steel fully MIG welded. The standard height matches factory measurements so the engine remains in the same location as stock. I also now have a 1″ drop version that lowers the engine 1″ from stock height. This is useful to create more clearance for a larger intake manifold, lower the center of gravity of the truck for better suspension performance, and improve driveline angles if you are lowered.
Mount Height: This is a new option I added that lowers the engine 1″ from the stock position. This is generally only for the serious racer that has a good reason to do this. Lowering more than 1″ will require a lot of work. The main clearance items will be the steering line fitting under the oil pan on top of the steering rack, and the crossmember behind the engine at the bottom of the oil pan. A 1″ drop should clear these fine, but modifications may be necessary on your particular truck. The 3 main reasons for wanting to lower the engine will be:
- Additional cowl clearance for large intake or intercooler
- Lower CG and better instant center position for the suspension
- Improves pinion angle with lowered vehicles since it will raise the exit angle of the transmission
Lowered mounts are only sold in pairs.
Do not overtighten the main center bolt. It uses a locking nylon nut and will not back off. Overtightening can compress the mount which may result in an increase in vibration. Snug is fine so the gap between the poly bushing and tabs is taken up, roughly 22ftlbs.
LIFETIME WARRANTY. You will never break these 🙂