I posted that for a look at comparisons of the 261 to the 235.
The 261 is 11% bigger ci compared to the 235.
taxable (SAE horsepower 261 vs 235) 33.7 compared to 30.4 - 11% increase
Gross hp (261 vs 235): 135 vs 112 - 20% increase
Net hp (261 vs 235): 123 vs 105 - 17% increase