W2 heads

The econo’s That cracked on me were well known for cracking. I hear they corrected the issue with a vertical web by the lower row of bolts. Mine both cracked right by the W2 casted on the side. I got them new from a buddy doing some horse trading so I didn’t have big money in them and lucked out on an intake and two set of rockers. They maxed out at 260 cfm at .450 lift then dropped off. By time I went to port them I heard of cracking issues so I stuck with the 3/8 diameter 2.02 valves and when I hit 305 cfm I quit and put them on my 408 that easily went 9.80’s on pump gas. When the leaks got to bad I took them off, leaned them against my shop wall, and sold the intake I ported and two sets of rockers. I’ve bought and sold two sets of race heads without even trying them. I hope to never port cast iron heads again.