How to fill in Air Pump Holes
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Fleet Mechanic
Joined: Jan 2004
Posts: 1,465
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From: Southern Alberta
How to fill in Air Pump Holes
I have a 302 with D80E heads and dont want to use an air pump in my application.
How do I best fill in the holes where the air pump bosses sit in the heads?
I don't want it blowing exhaust out thru the air pump holes...
Can I just fill it up with orange RTV or will that just blow out?
Anyone done this or have any suggestions for me?
RF
How do I best fill in the holes where the air pump bosses sit in the heads?
I don't want it blowing exhaust out thru the air pump holes...
Can I just fill it up with orange RTV or will that just blow out?
Anyone done this or have any suggestions for me?
RF
Posting Guru
Joined: May 2003
Posts: 1,011
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From: South Dakota
I would use a tap of a size that will work and tap in some threads. Then use set screws to plug the holes. Of course this could only be done to a race only or off road only appliction vehicle.
Elder User
Joined: Mar 2003
Posts: 692
Likes: 1
From: Saratoga USA
You have got to tap the heads, then plug. And, make sure to use a pipe plug, just tapping for a standard bolt or set screw won't seal properly. As I recall, either a 1/8 or 1/4 inch NPT plug works, but it's been a long time since I worked on a 302.
Senior User
Joined: Oct 2003
Posts: 480
Likes: 1
From: Elyria, Ohio
Heads must very in design for these air pump pipes alittle. I have 1979 302 and the holes in the head are about 3/4 inch in diameter and down inside are taped holes for 5/16"x18 bolts. Looks like I would have better luck with an expansion (freeze) plug??
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Fleet Mechanic
Joined: Jan 2004
Posts: 1,465
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From: Southern Alberta
rainbowATF, that is the exact same as mine are. There is a tapped hole straight at the back of the opening, I put a bolt in there to plug that hole and blew into them (my engine is on a stand).
When you blow into them, you can hear the wind in the headers, because there's an *untapped* hole that goes off to the right or left, depending which side you are on, which is where it's open directly to the exhaust ports. The tapped hole must be just to hold the stock bosses in place for the air pump.
My application is on a truck, the original heads had these holes plugged with cast iron or pig metal from the factory. My new heads are the same part #, D80E, but were off a car and have the hole in there for the air pump connection.
I wonder if I can use 3/4" freeze plugs in there.. or would they blow out too?
BTW guys, I am not concerned with hooking up the original pollution control setup, since the engine is going into a '64 pickup. Also, the original '78 pickup did not have an air pump either.
RF
When you blow into them, you can hear the wind in the headers, because there's an *untapped* hole that goes off to the right or left, depending which side you are on, which is where it's open directly to the exhaust ports. The tapped hole must be just to hold the stock bosses in place for the air pump.
My application is on a truck, the original heads had these holes plugged with cast iron or pig metal from the factory. My new heads are the same part #, D80E, but were off a car and have the hole in there for the air pump connection.
I wonder if I can use 3/4" freeze plugs in there.. or would they blow out too?
BTW guys, I am not concerned with hooking up the original pollution control setup, since the engine is going into a '64 pickup. Also, the original '78 pickup did not have an air pump either.
RF
Last edited by Ringo Fonebone; Mar 29, 2004 at 10:28 AM. Reason: spelling
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Posting Guru
Joined: May 2003
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From: South Dakota
I would use the pipe plugs. Heavier construct and will last longer. Pipe plugs are dirt cheap.
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Elder User
Joined: Apr 2003
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you're talking about the holes in the ends of the heads - correct - If so you could use a frost plug the correct size or get the inserts from Ford and screw them in and then put a bolt in the insert , because these are the same on both ends of the heads and your accessories bolt on there as such they are threaded and have an insert.
Elder User
Joined: Dec 2003
Posts: 655
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From: Miami
I went to a nut & Bolt supply house and he had a plug that threaded into the head with out buying the insert, which by the way are the same insert's you have on the front of your heads to hold the accesory bracket's. Go to a junk yard and yank them off a head.
Al
Al
