1501 Rocker Arms Instructions
Due to the decades of mass production, updates, and revisions, Briggs & Stratton Cylinder Heads are inconsistent. A professional engine builder must install these rockers with machine shop capabilities to address variations. They cannot be installed with a lack of experience or negligence.
One notable example, most Briggs heads use metric thread, but they also made versions with standard or SAE threads. The Rockers are packaged with a rocker stand and M6 metric bolts. If you have the standard threads, you will need to purchase the correct hardware.
There are also two additional holes in the rocker stand. They are for those that choose to modify the cylinder head for extra support. Again, a trained professional must drill, tap and install hardware for this. We do not include additional hardware.
Check Clearances and Installation
After installing rockers, you will need to check your pushrod length to sweep the rocker across the valve tip properly.
Once you have the proper pushrods and rockers installed, you will need to check your valve spring clearance. Check for coil bind on the inner and outer valve spring. You need a minimum of .030" before the coil bind of either spring.
Next, you need to check your clearance between the bottom of the valve retainer to the top of the valve guide. You need a minimum of .050" clearance.
Next, you need to check your clearance between the retainer and the rocker arm. DO NOT FOR ANY REASON GRIND OR CUT ON THE ROCKER ARM.
Once you have done all your dry fitting of your valve train, make sure you use a high-quality assembly lube to lubricate the trunnion shaft, rocker arm bore, and roller tip. We recommend Maxima Racing Oil Assembly Lube or Grease for all of your engine building needs.
After assembly or when your engine has sat for a few days, pour oil over the rockers. The rockers are the last part of the engine to get lubrication during start-up. Make sure they are entirely covered. You can't put too much oil on the rockers.
These are still air-cooled lawnmower/power equipment engines not engineered beyond the manufacturer's recommended applications. As such, THERE ARE NO WARRANTIES OF ANY KIND ON THESE ROCKERS OR ANY ENGINE COMPONENT. That said, EC Carburetor nor Briggs & Stratton are responsible for damages to your machine or persons as a result of using these products.