Originally Posted By PorkyPig
My memory ain't what it used to be but I thought the iron 440-1 heads have a reputation for cracking. I know Indy says they're 80 pounds heavier a pair than the aluminum version.

I can attest to the weight! I considered using a come along to lift them into place!

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky