Pontiac Heads

[rmfowler32506@yahoo.com]

Hello Pontiac Fanatics,
I am the owner of a 69 Automatic GTO with a 72'400 Mtr and would like to put some better heads on it. These are the heads that I came across:

69' #48 Heads (325 hp automatic Tranny / 330hp-366 Manual Tranny)

70' #12 Heads (Ram Air III-330-350hp Manual Tranny / 345-366hp Automatic Tranny)

70' #15 Heads (360hp for a 455cid mtr)

Questions:

*Can I use the #15s on a 400 motor?

*#12 Heads-Do I need to look for something other than the #12 stamp in order to identify these as real R/A III Heads?

* Same for the #48s?

Thanks Mike

 

[melsg5]

1. 1970 #15 is a small valve low compression head on a 400, 87 cc versus about 71cc.
2. The other 2 heads should have large valves and be about 71/72cc, see the link below and then look at other info on the same site.

http://www.wallaceracing.com/head1.htm