Quote:
Originally Posted by Barry_R
A 427 will outpower a similarly equipped and sized 428 or 390 pretty much all the time. The bigger bore equals better breathing. No question about it. If I am building a Cobra for myself its gonna be either a max effort 427+ racer type of deal or a 390 based sunny day cruiser. I think the 428 is a great middle ground selection - but I am not much of a "middle ground" guy  |
Barry, I know you can get 550HP out of 428 block, you've done it before. That seems to be right around the "usable limit" of HP for most Cobras. Can you get that out of a 390 block and have it last, say, 25,000 miles before it needs refreshing?