should i keep my 7bolt head?

[Super Bleeder!!]

i'm not saying a ported 1g head will give you problems, it will flow a lot of air but have a lower velocity through the port. i don't want to type out an essay, because the subject matter in this case is huge. just go do some reading on the subject and try to get away from the idea that bigger ports and tons of porting are its at.

[Super Bleeder!!]

come to think of it, there was an article in Modified awhile ago written by Martin @ AMS about this very topic. from what i remember, in summation, it said that the 2g head outflowed the 1g head to about 7k rpm, after which the giant ports on the 1g finally did something.

so for all out race, when all you care about is the 7-9k rpm powerband, the choice is obvoius. for everything else, the choice is again, obvious :)

[slowbubblecar]

so for small turbos like the 16g you would be better off with a 2g 7 bolt and bigger turbos would be better with the bigger port head since you need more of the higher rpm's?

[rst95eclipse]

Good call, a 1G 6-bolt head is better than a 2G head. The 2G head is better suited to be ported though once you decide to get crazy with stuff.
True. A 1g will respond better to bolt on mods, since it flows more. But if you're going to do a bottom end rebuild, you might as well keep the 2g head and port the hell out of it. This will give you some info that would be discussed later, if the battle waged on.........

http://www.indycarz.com/about14954.html&sid=f4151809c3a63c9a1012ccfb3e052772