quote:Originally posted by andriyko:
...For BHP SAE NET we are looking at 10 to 20 BHP less than the figures you gave...
Bohdan I believe the figures would be approximately 40 BHP less. Notice I bumped the '72 Cobra Jet from 280 Net to 320 Gross. The '71 351C 4V & '72 351 Cobra Jet do not make good motors to compare before & after ratings because their specifications are so different. In fact, its impossible to compare any Ford engine between the '71 and '72 ratings, because Ford motor compression ratios dropped across the board in '72.
Skimming through a Chilton manual for those years, looking at GM motors, Mopar motors, etc, there are few motors where all the specs remained the same between '71 and '72. Either the compression ratio dropped, the rpm for peak BHP dropped or the intake valve timing changed (indicating the camshaft timing was retarded). One instance where all those parameters remained the same were the Mopar slant sixes, the 198 cubic inch slant six was rated 25 BHP less (20%), the 225 cubic inch slat six was rated 35 BHP less (24%). Those specifications were also the same with the Olds 455 cubic inch V8 which was rated 50 BHP less between '71 and '72 (14%).
cowboy from hell