Hey newbie here. been checking out the site for a while. My question is, has anyone ever used any old 283 power pack heads casting # 896. I have a set lying around and my small block performance book says they have 137cc intake runners and 59 cc combust. chambers. Would it be worth the while to have larger valves installed with hardened exhaust seats. The stock intake valve dia. is 1.72". Im trying to save a little money and use some stuff I already have

 

They're ok, but by the time you actually put them together so that they work, you could have bought a set of 416 or 081 castings and ported them at home and made a lot more power outta the 416/081's.

 

Well I get everything done for about $250. I did all of this before on a set of 041 heads for my 355 S10. I get a pretty good deal on quality machine work and I already have the heads so I wont have to look for another set and they will probably need work too, plus if I don't use them for something they will just sit around. They are a very thick casting so I can port the living crap out of them and they have got to be better than LO3 heads so what the hell

 

283 power pack heads won't have the necessary bolt holes to mount your accessories

 

for all that look around for the 487x castings. they have all the accsesorie holes youll need as well as being one of the best stock flowing SBC heads around. 160cc ports and 72cc chambers.