should i keep my 7bolt head?

96 Gsx Awd · 03-17-2006

i have a 7bolt motor in my car but i am looking to buy a 6bolt block here soon but i dont know if i should keep my 7bolt head or just get a 6bolt one. let me know what you guys think . thank you

Super Bleeder!! · 03-17-2006

7 bolt heads are good

there is a ton of information to go over on this topic, like port sizes and flow vs velocity etc.

but yes, i would keep the head you have.

slowbubblecar · 03-19-2006

I would ditch it and go with a 6 bolt one. I heard the 6 bolt ones flow a lot better in factory form. Make sure you are able to get a good one though. I swapped 3 "good" 6 bolt heads on my car last spring and had to keep switching because they gave me bad compression results.

NOT THE BLUE LAMPSHADE · 03-19-2006

I have a good 6 bolt head for sale, $200, pm me if youre interested and want to come out and get it

I also have my block for sale, but don't have the tools or anything to get it out of the car, $200

763 6077959 call if you want too

Tom

**Kracka** · 03-19-2006

A 1G 7-bolt head is superior to a 1G 6-bolt head.

**Kracka** · 03-19-2006

Quote:

Originally Posted by slowbubblecar

I would ditch it and go with a 6 bolt one. I heard the 6 bolt ones flow a lot better in factory form.

Wrong.

slowbubblecar · 03-19-2006

I am assuming he has a 2g 7 bolt head since his car is a 96, so wouldn't a 6 bolt one perform better? That is what I was looking at.

**Kracka** · 03-19-2006

Quote:

Originally Posted by slowbubblecar

I am assuming he has a 2g 7 bolt head since his car is a 96, so wouldn't a 6 bolt one perform better? That is what I was looking at.

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.

Super Bleeder!! · 03-19-2006

depends on what you define as better. if all out drag is the goal, maybe. if drivability and part throttle are your thing, stick with the 2g.

also worth noting is evo heads have even smaller ports than 2g heads, do they seem to have trouble making power?

slowbubblecar · 03-20-2006

I don't have any problems with part throttle or driveability and I have a 1g head on my 2g with a 6 bolt. I didn't even notice the difference and my head is ported, has springs and retainers and cams.

I almost bought mikes crazy ported 2g head a long time ago.

Super Bleeder!! · 03-20-2006

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!! · 03-20-2006

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 · 03-20-2006

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 · 03-21-2006

Quote:

Originally Posted by S2kracka

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.h...12ccfb3e052772