Big Blocks

They are the same heads as the 400's no difference. And yes get the 440 rods if you can. It'll save you some $$$$. The larger the intake port the higher the RPM's will go and the less TQ the engine will make down low. This would be a real stump puller with the smaller heads with some work done. The key in the stock heads and on a 440 + CI engine is the exh. side The longer the stroke the smaller the port when a long rod is used. And a 440 has a long rod. The rod's that I'm putting in is 7.250.

You have to think of your engine as a 440 and no more.