Gen VI 427?
- Thread starter ZZ71s
- Start date
There is a good reason why very few people even consider building a 427 big block any more, its that with current heads and technology a larger displacement makes more sense, your cost will be similar either way, so while you could build a 427 I can,t think of a single reason to do so, when you could build a 489 cubic inch big block with the same bore and block using a 4.25" crank and 6.385: connecting rods.
lets assume both engines will make 1.25 hp and 1.1 ft lbs per cubic inch of displacement.
the larger displacement engine will produce more torque in a much easier to access power band and allow you to operate the engine in about 800 rpm lower average power band which your valve train will appreciate
427 =533 hp & 469 ft lbs of torque
498= 611 hp & 537 ft lbs of torque
viewtopic.php?f=69&t=5123
YOU MIGHT WANT TO READ THRU THE THREAD ABOVE AND ITS SUB LINKS
the only difference between a 489 and a 496 is a slightly larger bore on the 496 vs the 489
lets assume both engines will make 1.25 hp and 1.1 ft lbs per cubic inch of displacement.
the larger displacement engine will produce more torque in a much easier to access power band and allow you to operate the engine in about 800 rpm lower average power band which your valve train will appreciate
427 =533 hp & 469 ft lbs of torque
498= 611 hp & 537 ft lbs of torque
viewtopic.php?f=69&t=5123
YOU MIGHT WANT TO READ THRU THE THREAD ABOVE AND ITS SUB LINKS
the only difference between a 489 and a 496 is a slightly larger bore on the 496 vs the 489