In this section are parts for the Briggs Singles Model 28, 31, and 33. Check the description for fitment.
We commonly find these as race engines for C/P and G/P Racing Mowers. We have led the way for performance parts and have advanced mower racing to new levels of speed and competition. Not sure if you have a Non-AVS and AVS Block? A major difference between Model 31 Non-AVS & 31 AVS is the dipstick is in the block on the AVS and in the pan on the Non-AVS. Non-AVS engines with small journal crank on the pan side measures 1.380” and uses flywheel 6611-28. AVS flywheels with large journal crank on the pan side measure 1.625” and uses 6611-AVS. It’s critical to check your ignition time correctly.