I was working on my ZZ4 heads and need someone to tell me if this looks good or needs a little more work.

 

Another

 

personally I think it looks good but I would try and work the high spots out still.

 

I have done a bit more polishing and they look pretty good now.

I just bought the head porting book by David Vizard, and there is a section in there about porting these heads.
There is a pic showing what the chamber should look like and the spark plug boss is completly rounded off, almost so much where it is not even detected.

Should I do this?

 

i was told that you could reshape it but not completely remove it. its suppose to help with mix of the air and fuel

 

Stick to reshaping it. I completely removed it, but I have seen some nice reshaping of that spot. If I had to do it again, I'd reshape it.

Did you do anything to help unshroud the valves? Hard to tell but doesnt look like it. Also you should work on blending the seat although finding good information on how exactly that should be done may prove difficult.

 

Your right I haven't unshrouded the valves yet I need to go buy the head gaskets.
What are some good ones? I am going to be running nitrous too.

I am starting to just round off the boss and make everything a lot smoother.

Madmax
could you maybe draw something in paint or something to explain your ideas on reshaping and seat blending?

Thanks for the input guys.

 

Anything but Fel Pro. Ugh.
I'm running Cometic right now, very happy with them... but you have to have clean flat surfaces for those. Next up is probably the Mr Gasket version.

 

So the FelPro's suck huh?
I went ahead and gasket matched the intake ports to FelPro 1206 gaskets, any trouble with those?

 

Here is what I did with the chambers...

 

Intake port...

 

Intake Bowl...

 

Exhaust port...

 

Valve shrouding...

 

Exhaust shrouding...

 

Intake shrouding...

 

That looks good. I am in the middle of porting my Trick Flows right now too. On the combustin chamber though, what is that mass above the spark plug? Something to help swirl? Wouldn't cutting that down increase the combustion size?

 

FIRGGIN SWEET

 

Nice work.

I think Fel Pro's intake gaskets are fine, I will just never use their head gaskets again. After 2 failed 1010's, they can keep them.

 

The mass above the spark plug hole is the spark plug boss. In my earlier posts you can see what it did look like. I reshaped it to get more swirl. If you remove it all together you will increase the chamber size which will lower your comp. ratio.

 

the hump helps with swirl in the combustion chamber, which helps with cylinder filling

 

madmax,

where did th 1010's fail? Between the cylinders or around the coolant passages?

 

Is this from back when you first siamesed your intake ports on the tpi intake?

 

First set was from before then. Its the gaskets that are the problem, same failure for me and other people using them.

The stainless ring around the combustion chamber pulled away from the gasket, into the combustion chamber on the front and rearmost areas of both sides.

 

What part number cometic are you using now? I will avoid the Fel-pro's for now. You were NA, correct?

 

Jonarotz, which intake manifold will you use with the 1206 intake gasket? Stock?

 

I am thinking about the Holley Stealth ram.

 

If I remember correctly on my old HSR engine, it could easily do a 1205 gasket, but a 1206 looked like it would have to have material welded on it. You could of course not weld material, but than it might not of been a strong seal or wall.

 

I found this pic of the HSR and 1206 gaskets. I will not fully port it but, I will get as close as I can.

 

Look how much material would be left on the top and corners. It would need to be welded. You need to port it at the top according to the picture, and that is where it would be thin.

 

I know, I will port it as much as I can. It looks like it would be too thin, I think there would be a ton of sealing problems if it were fully ported. It won't be a problem if the intake is a little smaller.