390 vs 408

dodgetkboy78 said

Be a real ***** if you ended up with a 600$ 360 block that needs tons of work too...........

I have asked this before, and no one can tell me......

HOW much does .060 bore size difference make with valve shrouding? Is there any documented numbers?

Click to expand...

Dare I say anything? Well here I go....

I have to agree with the bore shrouding.But it can be alleviated by notching the bores beside the valves.

Cubic inches doesnt always win.A well built 470 stroker will spank bigger 500+ inch motors all day long. Just depends on how much your willing to do/spend.IMHO this has something to do with the 400 blocks large bore and humble 3.92 stroke.

The driveability/street manners of the bigger motor will likely be better.