762 Twin Tower Heads

[Dan D.]

I have a set of these heads that I have owned since the mid sixties. Just dug them out with the intent of taking them to Carlisle. I cleaned them up with some simple green and looked them over. To my surprise, what I thought were pristine heads, turns out they are not. This is what I found.

Dated July 25, 1956 and August 8, 1956. (G256 and H86). This is fine.

Both heads have a very narrow sealing rim for the lower edge of the valve cover. This indicates that the intake surface has been milled - to compensate for a milled the head.

Both heads have been ported - notice the round exhaust ports.

Other than this the July head looks to be okay. The August head has some other issues.

The casing is broken at one of the middle intake port threaded holes, and a nut has been welded on to repair it. It appears that Osama attacked this twin tower a long time ago.

The rocker studs have been pinned.

The valve guides have been replaced.

While both heads are red, after cleaning I see there is orange paint under the red. I do not understand this.

Okay, while there are some issues, these heads could probably still be used, with nothing visible from the exterior.
I am thinking about having them thermally baked, blasted and magnafluxed. If there is insurance that there is no cracks, then the risk to a buyer is much less. The machine shop I use can do this for $125.

So my question is what does the forum think about this, and what might the value be if I decide to go this route?

I can post more pics.

First pic shows the broken flange.
Second shows the welded - on nut (but not very well).
Third pic is the pinned studs
Forth is the ported (round) exhaust ports.

Just goes to show that there is very, very little 58 year old stuff that is pristine, and this 'stuff' was done in the early sixties, or before. Believe it of not, I don't even remember where I got these things, and I have never done nothing with them. Just want to clean stuff out.

Interesting - thanks -Dan

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[Gene M.]

Re: 762 Twin Tower Heads

Dan,
Are these the 61 on back big port fuelie heads? Casting number? That head with the broke out threaded hole can be repaired by flame spray. Ask Danny at Farmers about it. This is an option in non high stress areas of the casting which this is. Of course the machine surface will need to be surfaced but he should be able to kiss it flush with the current surface. That is one way to get them tanked clean as everything they do is top notch and clean when you get them back.

The porting and pinned studs indicate these heads saw some RPM's............

[Dan D.]

Re: 762 Twin Tower Heads

Gene, I don't know what you mean, 61 big port fuelie heads. These are 3731762 heads - used on 1956 225HP dual quad 265 CI engines. According to previous threads on this forum they may have been used into early 1957.

I am not familiar with 'flame spray'. Dan Martin did not mention this when I took the head to him yesterday. I will ask him. I left the head with him, but not do anything with it until I learn more about it. I still have the other head.

Yes, I'm sure these heads were well used in their day. These heads have an interesting story to tell, but unfortunately that history is lost forever. It sounds like the one head probably pulled a stud, as the other head is not pinned and has not had the guides replaced. If I could venture a guess I would say the broken flange resulted from lifting the engine using that hole.

-Dan-

[Dan D.]

Re: 762 Twin Tower Heads

Any opinions/advice on this? 82 people have read this, but Gene is the only one that has responded.

Thanks, -Dan-

[Gene M.]

Re: 762 Twin Tower Heads

Dan,
I don't know anything about the 3731762 heads other than observations from looking at your pictures. These heads are designed for the smaller bore 265 engines hence the smaller valves. They should have some value to someone with a 265 chevy or vette that wants to maintain originality. The tri five chevy web site may have a larger audience for these heads as they built thousands more passenger cars vs the Corvette.