I think as long as they're the same length with the same size mounting hole, it won't make much difference as long as they are balanced. The heavier blades will act like a flywheel and may give you a little better performance in heavy cutting. Jacobsen used to have the best push mower on the market because they used a big disc with 4 blades bolted to the outside of the disc. It acted like a heavy flywheel. They had to discontinue the design because of new regulations that required the blades to stop in a certain amount of time. Kind of dumb for a lawn mower that's spinning at 3600 RPM anyway but I guess the safety guys thought it was dangerous. Heavier blades shouldn't affect your mower and might make it work even better.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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