Need encouragement head replacement
 

I did a restore on a 1935 4 door a few years back. When I acquired the car it had on it cast iron head not aluminum.
Not knowing any better when I had the engine done I left the iron heads on. I have now acquired new cast aluminum heads and want to change them out with the iron heads but keep procrastinating.
Will I have trouble just swapping them out or are there some tricky thing that I need to know to do this job? Is there a certain way the heads have to be torque. Should I hire someone to do it?
Any thoughts would be appreciated

Re: Need encouragement head replacement
 

Don't hire someone. You'll find everything you need right here.
There's definitely a torque sequence that varies slightly with the different generations flathead.
Someone will chime in with the preferred head gasket too.
Here's an example of the torque sequence.https://uploads.tapatalk-cdn.com/202...d351af9b18.jpg

Re: Need encouragement head replacement
 

Use Best graphtite head gaskets, and liberally apply nickel based anti-seize compound to every headstud. Run antifreeze in radiator to prevent/minimise electrolysis. Doing all the above will mean that years down the track you'll be able to remove the heads!

Re: Need encouragement head replacement
 

I think you gentlemen may have missed the most difficult part of head replacement on early engines, which is removing the old heads. 48 and earlier heads are held on with studs and nuts, which may cause a problem. If you indeed did a complete restore a while ago, it may not be difficult to remove the old heads, which would be the best situation. If it has been a while, corrosion may have raised it's nasty head and could cause problems. It has been shown to be such a problem that special tools were manufactured to assist in their removal. A word to the wise.

If O/P does run into problems removing the old heads, I am sure there are plenty of threads on here that can provide advice and assistance.

Re: Need encouragement head replacement
 

Flat top or domed pistons which heads ?
Charlie ny

Re: Need encouragement head replacement
 

You will need hardened washers for the aluminum heads. The washers aren't needed with the cast iron heads.

Re: Need encouragement head replacement
 

I don't believe Tubman has first hand experience with early motors. I think you'll have no trouble removing the old iron heads, it is the aluminum head removal which can prove to be difficult/impossible unless you follow all the steps I posted above. Electrolysis between dis-similar metals; aluminum heads, castiron blocks, steel studs is accentuated by using copper head gaskets. Taking all possible steps as above, when installing ally heads will make life so much easier down the track when you wanna remove heads.

You will certainly notice a performance boost by running the aluminum heads, that makes the bit of extra effort well worth while in my opinion.
Just do it!!

Re: Need encouragement head replacement
 

What is the cause/reason for increased performance? I am not familiar, but I have a truck with CI heads.

Re: Need encouragement head replacement
 

Check post no 5,make sure heads are compatible with pistons first!!!!

Re: Need encouragement head replacement
 

Pardon me Brian, but I have had experience with the early motors including a session removing iron heads that had been on a long time. Please read what I posted. I did not say he would have a problem, just that he might. He asked for advice on what he might run into, and I think I gave him a prudent warning. As I said, just a word to the wise.

Re: Need encouragement head replacement
 

Are the heads you are going to use OEM heads or the later remade ones? A friend of mine bought a pair of the remakes (Kearney Pattern Works) which were beautiful looking but one side was horribly mis-machined, the combustion chambers were 1/8" different in depth from one end to the other tapering as it went. The original company (Kearney) sold their stock of heads out to someone else and luckily, the new owner swapped the bad head for a good one. Just saying, if they are the remake heads check them carefully.

Re: Need encouragement head replacement
 

drivers side head can be removed on car with little difficulty but pass side head removal interferes with the cowl and it can be difficult to remove because of this. by now you must realize that Ford had so much trouble with aluminum heads that the Ford service replacements were cast iron, usually these replacement heads were cast in the late 40's

Re: Need encouragement head replacement
 

Wise stuff Bryan but you can leave the "Just do it" quote out... grrrrr:eek:

Re: Need encouragement head replacement
 

Never make a modification without a reason. Astechics is the most expensive modification you can make to a vehicle. I have a great deal of respect for people that restore their cars to their original condition. However, as a daily driver???? This could be a very simple job. It could also be a nightmare.

Re: Need encouragement head replacement
 

"Never make a modification without a reason" Have to agree.
What do you expect to achieve by swapping heads?

Re: Need encouragement head replacement
 

Denny (tubman),
Excellent reply, not everyone knows what you do !
Charlie ny

Re: Need encouragement head replacement
 

Hi all,
Thanks for all the replies and different views.

On the concern of the hard removal of the old heads---I don't see this as a problem since the engine only has a few hours at best on it since it was done, you never know thought but I think I will be ok.:)

On the questions about OEM or aftermarket---They are Kearney Pattern Works heads and now you have me scared :eek:. I was told they take orders for them and when the have 10 sets they produce them but when I called they had them in stock and shipped them right away. I will have to investigate more before I install them.

As for the reason to do the change out---The plan was to keep and make the car original and I want to stick to the plan. ;) The car is not a daily driver and I bought the heads already so what the heck.

thanks again, keep the comment coming
Tom

Re: Need encouragement head replacement
 

Hey, the chances are the heads are OK, just saying to check them because errors do happen. I know of several people with them that are fine. I really like how they look.

Re: Need encouragement head replacement
 

I really didn't expect you would have any trouble removing the iron heads, but any slab of cast iron held on by 21 3" studs is a potential problem. Good advice on checking the heads first. I do it on all of them, even stockers. Good lock with your project.

Re: Need encouragement head replacement
 

If you have never had a problem removing heads that have studs, you are indeed very lucky. Recently I tried to disassemble a 59 AB engine and I had to make a puller that mounted in the spark plug holes to pry the heads off. I have disassembled a lot of these engines, but this one was near impossible. And they were cast iron heads.

Re: Need encouragement head replacement
 

Back the nuts off 3-4 turns and hit the starter. Heads should pop loose.

Re: Need encouragement head replacement
 

Might want to verify that you don't have to replace the bottom row of head studs. Some aluminum heads are thicker on the bottom requiring it. If you think removing the head is fun. heads studs can really be fun.


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Re: Need encouragement head replacement
 

I would rather have original ford cast iron over aftermarket aluminum. Which everyone that knows flatheads would know they aren't original, usually.

Re: Need encouragement head replacement
 

Never worked for me.

Re: Need encouragement head replacement
 

Finding some nos 21 bolt heads would be a feat.

Little rich for my blood. Milling iron.
https://handhflatheads.com/?s=21+stu...ct&dgwt_wcas=1




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Re: Need encouragement head replacement
 

Tinker,

I have a pair of NOS 21 stud aluminum heads hanging on my shop wall.


What should these be worth?