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Ok guys I am new to the site but not new to building motors. However my question is this after searching the endless number of forums about bad Castech 706 heads I haven't been able to find an answer to this...
Who besides Castech manufactured cylinder 706 heads. I don't need flow numbers or valve sizes or even what head I should use and which is best. I simply want to know who manufactured the heads that I have on my 2000 Tahoe? They are not Castech as you can see from the pic but who's are they?
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Just another 706 question... Or is it?!?! 
