Head casting question

[NateFrame]

Quick question here. I have a 6 bolt turbo head and a unknown head in my garage at this time. I am asking to see weather or not I can interchange them because one is much cleaner than the other. There are some identification marks on the 2 heads.

the non turbo one (six bolt/seven bolt)???
It has a "T" under the cam sensor, and between the two cams it says "G6" and there is a "6" under it.

The 6 bolt turbo head has a "t" under the cam sensor and between the two cams it has "G6" and below that there is a "5"

thanks very much for any help. -nate-

 

[TwoLiterLaser]

Are the bearing surfaces of the dirtier head marred? Is there anything wrong with it other than it being dirtier than the "unknown" head?

 

[NateFrame]

there is just alot of gunk on the outside of it. Both heads look fine to me. However I am intrested to know if they are interchangable. I was going to run the stock head for the time being, then build a nice head as funds become available. I am still thinking of what parts to put in it. Defintally some different cams, and some good valves, but I have to do a little more research before I can make a good decision.

 

[Talesin]

Just pressure-wash the dirty turbo head. There's no real difference between the turbo and nonturbo head cores (though obviously the parts that go on are different). Though there IS a major difference between six bolt versus seven bolt. The head bolt holes on the seven bolt are much smaller, and six-bolt diameter head bolts or studs won't fit through without a good bit of machining.

 

[NateFrame]

thanks, I will clean that turbo head up. I did take my head bolt and put them in the unkown head. They fit, so I guess its a 6 bolt head. Wonder why they made the 7 bolt smaller? I would make them bigger.

thanks for your help, -nate-