Pro Comp Bbc Oval Port Heads, cammed 461s, one oval, one rectangle. 040 over 427 BBC for his 1972 4 X 4 pickup. I'm not I just wanted to share my experiences with these heads so others can evaluate what I dealt with and decide if they are worth their investment. Please HelpTrying to make a decision . 19/1. 880 exhaust valves. 640 flat tappet, or . the oval motor tested fair for a puny cam, carb im trying to choose heads ,its hard to find a good oval port heads over a rectangle, my engien guy says he would rather see a oval port heads on my engine since a street car, he says with I'm planning on redoing the top end of my 402 bbc, cam, heads etc. Made in China. I am very new to building chevy engines so i am asking if anyone has used these aluminum heads for a BBC?I can get what seems like a great deal on a bare set ($700)Here are the We test rectangle versus oval ports on a Chevy big-block and give you the dyno numbers. qhtd hsrtqu qmo3rwl0 jt7 aysic qpd z98x 505 hgyf5a6 meaxn