screw at the end of crank...help

TIP: stuff some soft 1/4" clothesline rope down enny sparkie hole to stop the crankshaft from turning so you can remove the 150 ft/lb torqued crankshaft bolt. Usually, the crankshaft pulley bolt is a "crownhead" crank'em bolt p/n 2N-6319-A1, 5/8-18 X 1-5/16 hex ratchet; and is tapered on backside to center the pulley.

Power is governed by rpms or displacement or compression. The 26 hp N-Engine is governed at 2200 rpms, max power is 1800 rpms. Hot-rod cams increase power by improving breathing at high rpms, not an N-Engine specality. The displacement can be increased about 4% by throwing out the sleeves and using slightly larger Merc piston and ruining the block for future rebuilds. You can mill your flathead MAX 0.010 before valves start beating the cylinderhead.

OR..... you could SUPERCHARGE IT!!! Get a Chevy bigblock SMOGPUMP for $20 from junkyard and a M/S carb for OHV NAA Jubilee (so the carb mouth lines up with smogpump output). Figger out some bracketts and belts and POWER AWAY. (TIP: read up on supercharging in hot-rod books)..... ..Dell