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  Topic Review (Newest First)
10-19-2014 08:12 PM
PSIG
Re: C6OE, exh ports humps

That's correct, but they are tapered for sealing. See here. Sold in pairs or sets of four at under $10 shipped.

David
10-19-2014 03:50 PM
[email protected]
Re: C6OE, exh ports humps

Quote:
Originally Posted by PSIG View Post
If the ports are drilled, there is no need to block or fill them, as we saw no negative effect from leaving them open. The exhaust simply blows past them like the open door on a skydiving airplane. Just blend the lumps and move-on.

David
thanks, i'm blocking off the port in the back cause i don't want exaust to exit to back of engine. i think it's a 5/8nc if not mistaking
10-19-2014 02:50 PM
PSIG
Re: C6OE, exh ports humps

If the ports are drilled, there is no need to block or fill them, as we saw no negative effect from leaving them open. The exhaust simply blows past them like the open door on a skydiving airplane. Just blend the lumps and move-on.

David
10-18-2014 07:32 PM
[email protected]
Re: C6OE, exh ports humps

mine must be from ca. then as there is a 3/16-1/4 inch hole for the smog pump
10-18-2014 10:10 AM
n2omike
Re: C6OE, exh ports humps

Quote:
Originally Posted by [email protected] View Post
can the holes be plugged if not hooking anything up to the port in the back of the head?
The nubs are solid. I believe the only ones they are drilled on, are the California cars... and with those, the nubs will have a hole in them for the air to come out of. Even if they are drilled (CA application), a person should be able to plug the end of the head where the air is injected.

When porting these heads, I grind the valve guide boss out as well. From the port exit, it's a straight line to the back of the bowl. I do that, and have bronze guides installed. The intake ports need a LOT of work as well... as they are only 126cc stock. I ported the hell out of my 289 heads back in the day, and they were a whopping 155cc.

Performance wise, there is no reason to use these old heads. The cost to rebuild them is almost as much as buying a name brand aftermarket set. The only way I would fool with a set of stock heads anymore, was if I was BROKE, desperately needed an engine running, they were in perfect shape, and needed zero rebuilding. Then, any grinding you do is pretty much "free" horsepower. Other than that, buy a set of Edelbrocks or something.

Good Luck!
10-17-2014 06:52 PM
[email protected]
Re: C6OE, exh ports humps

Quote:
Originally Posted by Huskinhano View Post
The purpose for those bumps is nothing more then a flat spot when drilling the AIR ports. Have you ever tried to drill at an angle?
can the holes be plugged if not hooking anything up to the port in the back of the head?
11-03-2012 08:10 PM
Huskinhano
Re: C6OE, exh ports humps

The purpose for those bumps is nothing more then a flat spot when drilling the AIR ports. Have you ever tried to drill at an angle?
07-21-2012 04:56 AM
Hottarod
Re: C6OE, exh ports humps

Sorry I haven't kept up with this post. Those are thermactor bumps. All heads were cast with them but only certain places had them opened up like California I think.

Here is a good article on porting 289 heads.
Mustang Exhaust Port Matching
07-05-2012 11:09 AM
my0wn3ds
Re: C6OE, exh ports humps

Quote:
Originally Posted by Hottarod View Post
The bumps.Yes, just flatten them out and leave it at that. Don't take any more material out than you need to.


Not very many people porting heads anymore. I've done 3 sets now and I'm on my second go around on the ones I run now.
As I understood your post I should leave it in this condition (see photo).

I have no right for mistake because here is no machine shops to repair iron heads and another head from US will be very expensive.

What for this bump? What is under it?
07-04-2012 04:23 PM
Hottarod
Re: C6OE, exh ports humps

The bumps.Yes, just flatten them out and leave it at that. Don't take any more material out than you need to.


Not very many people porting heads anymore. I've done 3 sets now and I'm on my second go around on the ones I run now.
07-04-2012 11:54 AM
my0wn3ds
C6OE, exh ports humps

Hello.
My 1st head porting.
May I cut these humps in exh ports?

Sorry for poor photo quality and bad english)

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