400's are they any good?

Yeah the net ratings are more true except for the earlier 383HP which was what it was and had the pistons not too far down in the chamber. Now the 71 383HP is a different story. The 400HP is the same power when you convert from gross to net power figures.

Here's something to think of though. If the 360 was a replacement for the 340 then why was it not offered the the lighter cars it's 1st year out. In 71 it was available in the C-Body and not sure about truck/van applications. Just something to think about.