heads??

[Keoki1978]

Just wanted to post about these heads we got on our 60* V6. I'm talking bout the aluminum heads here, mostly the newer Gen 3 heads. I have 2 sets, I keep the other big valve heads for a future project, but why is it that one head has 1 port that doesnt line up properly. I noticed this on both set's I've got. Anyone else notice this?? So should I look for another set and match them based on the gasket? The manifold matches perfectly, I can take any 1 gasket and go from one head to the other, and one head has a port that looks to be about 1/8 off location. Even the old small port 3100 from my 95 gagt has the same condition. My other 2 sets were off 2002 and a 2001 3100 malibu. I think this isnt going to be a serious problem, but could hert flow to that one cylinder.

[bszopi]

Pic of what exactly you are talking about? I think I understand, but pictures are always better.

Is there enough meat around the port to gasket match the ports to take away any potential flow disruptions?

[bszopi]

Here is a possible pic for you...



So I'm guessing you are referring to the far right port?

[Keoki1978]

sorry, just got back online. I think the pic above is a perfect example. I'm not sure if there is enough material to remove. But you get the point. So why is it only one head of the 2, and I just got off the phone with a friend of mine telling me he'd go find a matching set. Anyway, does anyone know if the 3500 heads have this condition?? If anyone here has a set, take 1 gasket and see if it matches both heads and post your results.

[Keoki1978]

does anyone have a set of 3500 heads that can tell if they have the same issue as the 3100/3400 heads. I just got a set of 3400 heads in yesterday and these were off a 03 GAGT, same thing as my 01 and 02 3100 heads. I cant get a set of heads from the bone yard yet, they dont want to seperate them from the engines.

[1meanz]

i dont get what your asking. thats how all the 660s that i know of are.

[Superdave]

that's why we gasket match them.. takes 30 sec per port with a die grinder and a good bit.

[SappySE107]

I don't gasket match them

[Superdave]

I don't gasket match them

you're weird though...

and OP, yes.. 3500 heads do have a little material to remove, usually around 2mm or so. they were cast better than the older stuff.

[34blazer]

that's why we gasket match them.. takes 30 sec per port with a die grinder and a good bit.

has anyone measured the port to make sure that the seemingly extra material
removed on the last port is, in fact, extra material? looks to me like it may be the gasket is a little off?

[Keoki1978]

i dont get what your asking. thats how all the 660s that i know of are. the gasket from one head fits the other. both heads are identicle...

The pic above is what I'm talking about. The last port on only one of the cylinder heads is off location. These 3400 heads I got were the same way. I got a new revision 3100 gasket set, I can take one gasket to one head and it fits like a glove. I can then take that same gasket, take it to the other head and the last port on the right side when looking at it is off like 1/8 of an inch.


that's why we gasket match them.. takes 30 sec per port with a die grinder and a good bit.

I'm not sure I want to remove all the material from the one side. One port would be huge, the pic in this thread is exactly what I'm talking about. If the 3500 heads have the same issue or they were more on center sort of to the gaskets for a better gasket match or just to be sure the ports line up properly with the manifold.

[geoffinbc]

It is standard practice on any engine to gasket match the heads to the gaskets. If your worried about size then measure your gasket to determine if they are all the same. If they are then trace it to the heads and begin matching every port to the gasket outline. They you need to do the same to the intake. But you need to trace the intake pattern when it is bolted to the motor. You can use marking compound or machinist blue. When I did my gasket matching I bolted the intake to the motor with a few dabs of RTV Silicone between the intake and gasket. The next day I removed the intake with the gaskets stuck to it showing a perfect trace of where the gaskets line up. Then I used a die grinder and matched it all up.