5+ Year Contributor
- Mar 3, 2012
Im thinking of doin a 6 bolt head swap on my seven bolt block. Just wondering what is all needed to do this and what are the advantages? Thanks ahead of time!
i was just wondering because i was thinking about buying a 6 bolt head that has been rebuilt for $120. yea i should have used search...i just got out of surgery so im still a little loopy. my bad!!
If you go with 1G head, You need a 1G Intake as well.
The good thing on a 1G head is, the runners are way way bigger, But if you have a light mod, You should stick with the 2g, which it will flow better air.
1G head is more for high power (TOP END), which the bigger runners can flow more air.
Bigger isnt better. A 2G head will flow just as good and will actually spool faster.
Yes, I know that, But on very high power a 1G will be the winner, I know there is some turbulence on a 1G, But at the end, it will be the beast.
However, I did stated to stick with a 2G which it flows better.
you might miss understood my post.
If I recall correctly, a 1g head will drop right on top of a 2g block. Everything originally on a 2g head should bolt up to the 1g. You'll also need to wire in a 1g cas.
...you could just swap the existing intake camshaft to the new head to retain the 97 CAS; no drilling or tapping involved.Now keep this in mind. You MAY need to have your Intake cam drilled and tapped for your 97 CAS. If this is not something you want to to, look into getting a 1G CAS. Keeping your 97 CAS is recommended if it is possible.
And if you do still decide to go with the 1G head...
...you could just swap the existing intake camshaft to the new head to retain the 97 CAS; no drilling or tapping involved.
A 2G thermostat housing will not bolt up to a 1G head and, although a 2G intake manifold will, it does not seal. The CAS issue is really only applicable to the 2Ga as a 2Gb CAS can bolt up if the appropriate intake cam is used or modified.