440 Source Aluminum Heads

I've used a couple sets of them the last 5 years. As mentioned, clearancing is a must with 3/8 pushrods.
So, I have a new set going on a 470 build- decided to CC the chambers- and guess what- they are not 80cc as advertised; but averaged at 89-90cc. Far cry from 80! So, took off 45 thousandths to get them down there.
I will say that Kim at 440S was willing to exchange them for new ones, but I had already done extensive porting :(