Aluminum Heads ?

I changed from home ported 596s with a Cr of 10.4 to Eddy magnums with some porting to remove some of the pinch point and blended the intake and exhaust ports with Cr 0f 11.9 with double quench @.035 and gained a whole 2/10ths. would I do it again - NOT. check out the CI EQ magnums if you are upgrading. M2CsW.