| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
01-25-2000, 01:10 PM
|
|||
|
|||
I found a set of 5C heads which, according to the specs I have, are the same cc and valve sizes as 6X. Are there internal differences, i.e. port shape/size? Are 5C heads a good choice for a street performance 462?
__________________
Slower Traffic Keep Right |
|
#2
01-25-2000, 01:10 PM
|
|||
|
|||
|
I found a set of 5C heads which, according to the specs I have, are the same cc and valve sizes as 6X. Are there internal differences, i.e. port shape/size? Are 5C heads a good choice for a street performance 462?
__________________
Slower Traffic Keep Right |
|
#3
01-30-2000, 03:59 PM
|
|||
|
|||
|
According to Pontiac Enthusiast Magazine (9/99), 5C heads are an AIR version of similar post-'72 6X's. I have always been told that the 6X's were the way to go on 455 blocks for pump gas performance. Apparently they breathe better than 5C's. If those 6X's are #8 stamped, or even if they're #4's, I'd go with them.
400 5C heads are stamped #7, 350 heads #9. If by chance you have 6X stamped #2, WOW! Hope this helps, Double |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
