erlindsey
02-18-2009, 07:36 PM
Looking for a set of 350 pontiac heads, 1968 casting# 18 or 1969 casting # 47
thepontiacman
02-25-2009, 01:08 PM
I should have some #47 '69 350 heads. email me:
[email protected]midyear
02-26-2009, 08:53 AM
I have a pair of 68 # 18's
erlindsey
02-27-2009, 01:19 PM
Im intersted in the 18's. Send me a pm on a price.
erlindsey
03-01-2009, 12:34 AM
Im looking for a set of 18's as I found out that the #47 heads are only rated at 255 hp. Thanks
Donovan
03-03-2009, 02:50 PM
Same ports, same performance potential, same flow numbers stock. The 47s have a 45 degree intake and the 18s have a 30 degree intake however. Same valve size.
The 47s are a lower compression head by a little but they can be milled and will be a better pump gas head. FWIW
No advantage to the 18 other than the small chamber and the end bolt holes being drilled already on the exhaust side. The 18s are even press in stud.
If you need to have really high compression then they are the only choice however.