Thanks for the input gentlemen.

John you know hwat I am building and Im just trying to comprehend what those Canfield heads will run like compared to lets say Brodix RaceRite oval port aluminum heads with the 270cc oval ports VS. Canfields 310cc rect port

to refrsh for any appretiated additional comments here is the build to this point:

454 .030 over
Cast iron crank (10/10)
Stock rods with ARP harware
TRW forged small dome pistons (L2349F; LS6 repo piston)
Howards cam: 304/314 adv dur; 234/240@.050;
.540/.540
110 LSA
Some type of dual plane intake (rpm air gap)
750-800 cfm, vac secondary holley type carb

going into a 66 chevelle
Th400 Trans with 2500-3000 stall
3.73:1 rear gears approx
(NOT a daily driver. 95% street driving, occasional strip; like most trying to get the most fun out of what I got)

I love the price and value of Canfields heads...but once you buy them with the CNC upgrade to be sure equal comb chamber size they cost just a few hundred less than some quality oval post aluminums with smaller intake runner sizes. Like I said just trying to educate myself best as possible before making a purchase.

Thanks again for sharing your smarts gentlemen.