EDD,
I called B&S and left message to call back. The wait time was 13 minutes.
ur two engines seem to be identical @ first glance. Cast iron sleeves,
beefed up cylinder block and debris filtration.
I called the mechanic where I bought my mower and he said same engine as far as he can tell.
In one of my videos
https://www.youtube.com/watch?v=8Qi6ne9UNRw
you can see me cutting some really high stuff (Bush Hog like)and the engine does not bog or strain at all.
model 49L977 49.42 cu in
Engine Selection
Match the engine’s performance and cost to your specific application to get the optimum performance at an
affordable price. That means better value for you.
• Vanguard™ OHV (overhead valve) engines are maximum performance, cast iron sleeved engines.
- select for continuous heavy duty applications.
• INTEK™ PRO, Industrial Plus™ and I/C® (Industrial/Commercial) engines are cast iron sleeved.
- select for medium duty commercial, industrial and rental use.
• INTEK™and PowerBuilt™ engines are aluminum cylinder bore OHV engines.
- select for general consumer use.
• Standard engines are aluminum cylinder bore, side valve engines.
- select for general consumer use.
We have cast iron sleeve
Here is a 724 cc with massive torque 53.45
Series 8 Commercial Turf Series