I am seriously considering doing a porting job on my 455 1975 heads. I will be doing this myself and I must warn that it will be my first time. What do you guys think? Please give me the straight answer on this. I bought this set of heads for $25 bucks.:grin: Thanks Alex
Alex Try this site. Use those heads for practice, then get an earlier set. Your best bet, something '72 or newer. http://www.sa-motorsports.com/diyguide.shtm
im thinking of porting my heads when i build my 455. im too lazy to even ID the motor! i know its either 70-71 though so its good enough. im thinking of buying a head or two from the junkyard to practice. good luck on it and let us know how it goes!
Alex I think Reynold is saying that the 75 smog head design is such that you need to find some 70-71 cores.
i went to one of the best hot rod machine shops around here today. a basic street port job costs: 8hrs labor @ $90/hr = $720!!! mild street strip: 11hrs labor @ $90/hr = $990!!! race strip only is: 17hrs labor @ $90/hr = $1530!!! so needless to say i told them to shove the port job up their %$# cause there is no way ill pay that much. im no yuppie dork, i could get aluminum heads for nearly that much!!!
I have a local guy in Flint doing mine right now. Will post pics when done. Knows Buicks and does street port job for $350.
I've done my own for years. Mopar 440s, turbo 4 bangers, spitfire 1500s. Its not brain surgery. There are a few how-to threads on here, stuff in magazines, etc. Find a buddy and practice on his heads first. :laugh:
Yeah, its not too hard at all. It just takes hands on experience to actually get a feel for the work, thats why the practice heads, as suggested, are good. It can be very time consuming as well. But it is worth it.
75 heads So, I appreciatte your input in all of this, but clear something up for me. What is it about the 75' heads? smog? more detail is certainly appreciated. thanks alex
im going to go to the junkyard here as soon as the weather picks up and get my practice set off a riv. it has a 455. who knows, i may do such a good job i will use em!
Alex The '75 heads don't flow as well as earlier heads. Also, the exhaust cross over tube is difficult to block off. The combustion chamber is open which makes is harder to build compression (that's part of the reason these motors were 7.9:1)and a poor quench area. Much better off with earlier heads.
