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Discussion Starter · #1 ·
I sent my heads off to a rebuilder. I have D3VE heads with the air port hump right in the exh chamber flow. I asked him to grind that knob off, and he did. On 5 of the 8 ports, he went through to the channel that serves the air pump. It's on a boat, I do not have an air pump of course.

I did not like this, and asked him to find a solution to plug it. He has refused, and says 'run it that way'. My brother has worked for Ford for a while, and he is concerned that the end plugs in the head are cheap tin, and they are 50 years old, and will melt or blow out. This is not good as it's going on a boat, and I really do not want flaming hot exh gasses flowing out the port at front or back of the head.

What say you? I was thinking of using a drill and tap and block off with a small pipe plug. Other ideas? Sorry for the poor qual pic.
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Run the non threaded 7/16" rod from each end and then 2188 napa steel plugs.
8" & 10" lengths are fine. The passage is drilled from each end and rarely meets properly.
You can then if you wish use high temp silicone to fill the remainder of the hole.

This is more than enough to address your concerns.

Truth be told the replacement steel plugs if installed properly would be fine.
We don't plug the injection holes or feed until 500 hp.

This is what the boss looks like when cut down in an application where the boss is factory drilled for thermactor use.
Not a big deal.







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Discussion Starter · #4 ·
I'll do the rod and plugs. Not sure hi temp silicone will be of value. It's rated at 600F, and exh gases are often > 1000F. The EGT in my plane is red lined at 1550F, and often runs over 1200. Of course, a water cooled Ford is not an air-cooled Continental.
 

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I'll do the rod and plugs. Not sure hi temp silicone will be of value. It's rated at 600F, and exh gases are often > 1000F. The EGT in my plane is red lined at 1550F, and often runs over 1200. Of course, a water cooled Ford is not an air-cooled Continental.

We've been working with and porting iron heads for 25+ years.
Over this time we've established that the port cross talk makes little to no difference in an under 500 hp application without a long duration cam and significant overlap.

I am well aware of exhaust temperatures. :cool:
Silicone does NOT burn out of the holes as instructed. Of course you can certainly do as you wish.

I've seen several instances where individuals filled the entire passage with silicone...



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Good luck.








Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
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ParklandAutoMachine.com
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Discussion Starter · #6 ·
Just to make sure I'm working on the right place, I've taken a picture of the end cap in the head. The tin cap is clearly larger than 7/16" which is the size of drill bit shown. The end cap is about 3/4" dia. I would guess there is a step down to 7/16" inside the end cap?
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You are.

The steel cup is Napa 2188 which is 43/64ths. Odd size.

Long 7/16ths drill from each end to clear out carbon or the non threaded rod WILL bind.







Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
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Discussion Starter · #8 · (Edited)
Excellent. I'm on it first thing in am. Gotta work before it hits triple digits. Thanks!
Since it's never been run with the air ports open, I won't have any carbon in there. I'll still bore it with the drill though. While I have it apart, I thing I will do a bit more porting to open that exh passage up a bit more.
 

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Excellent. I'm on it first thing in am. Gotta work before it hits triple digits. Thanks!
Since it's never been run with the air ports open, I won't have any carbon in there. I'll still bore it with the drill though. While I have it apart, I thing I will do a bit more porting to open that exh passage up a bit more.
The passage will most likely have crap in it.
Port shape is far more critical than size.

That picture I posted is a really good D3 exhaust port.








Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
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See our products in the Vendor for sale section
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While I have only a fraction of the 'Porter's experience or knowledge, I have installed those plugs myself and they are thick enough to last a long time. I'm running D3s ported by the Mad Porter.

So I wouldn't worry about it. 2188 plugs and done
 

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FWIW, I've tapped the EGR ports at each end and installed set screws with a bit of lok-tite on the last couple sets of D3's, one set has been in use since '95 with no leaks. Great idea Scotty, on using the long dowel rod within the EGR "tube".
 

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The EGT in my plane is red lined at 1550F, and often runs over 1200. Of course, a water cooled Ford is not an air-cooled Continental.
Given you are a pilot you likely want most-best solution and full understanding of how/why. I'm the same way.

Awhile ago I was looking for a dyno tune on my S/C cobra. After a short conversation of me asking very specific details, tuner he asked me if I was a pilot, doctor or and engineer. I confirmed the later and he rolled is eyes and said 'price just doubled. Of course he was joking. :)

Anyhow, good luck with you build
 

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FWIW, I've tapped the EGR ports at each end and installed set screws with a bit of lok-tite on the last couple sets of D3's, one set has been in use since '95 with no leaks. Great idea Scotty, on using the long dowel rod within the EGR "tube".
We had to figure out a way to deal with the drilled thermactor passages in the iron CJ heads when we were doing port work for class racers.

Tubing works as well if one is not going to grind on it. Hard to find in 7/16" though.





Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
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What about the 2nd one back from the left hand side looking at it from the exhaust side. On my D0VE heads that one has a huge thermactor hole up inside it, do I just fill it with silicone or leave it alone? FYI from all other distinguishing features mine are D0VE heads, they just don't have those casting numbers on em.. I've checked really hard...
 

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That is a cross over to heat the intake. Block that passage in the gasket.
That is why Paul Kane and I created the laser cut block off plates for the Felpro blue intake gaskets.

That exhaust port does not have the thermactor boss drilled.

All early castings are essentially the same excepting certain CALI D0VEs drilled for thermactor air injection.








Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
 
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