Help with Cracked 1F head replacement (1 Viewer)

[Boynepark76]

So, my 72 has a crack in the water jacket on cylinder 5 valve area (pic). Its casting is 60050. I have an extra rebuilt head with casting 60030 that came off a 1969 engine. Can I replace it with this one? Thx.

 

[65swb45]

You may have a slight loss of compression going from a F155 head back to F145 head. But if your ‘72 bottom end wasnt rebuilt with the F155 in mind, then it may not matter as much.

Do you know if your’72 has the domed pistons?

 

[Boynepark76]

You may have a slight loss of compression going from a F155 head back to F145 head. But if your ‘72 bottom end wasnt rebuilt with the F155 in mind, then it may not matter as much.

Do you know if your’72 has the domed pistons?

Thx Mark. The pistons are domed. Heres pic. One can tell how Cylinders 5&6 were affected by the cracked head.

 

[65swb45]

Thx Mark. The pistons are domed.

You will have a slight loss of compression with the 60030 head. Also you will lose the end holes where the exhaust bolts up, which is more significant with a header than a stock manifold. And you lose the third mounting boss at the forward end of the passenger side, where the tow hook goes.

 

[Boynepark76]

You will have a slight loss of compression with the 60030 head. Also you will lose the end holes where the exhaust bolts up, which is more significant with a header than a stock manifold. And you lose the third mounting boss at the forward end of the passenger side, where the tow hook goes.

So I am now starting to wonder… what engine years did the 60050 head come from? I ask b/c I have 3 extra 1F engines w/ the following heads: 1969 w/ head 60030, mid-1971 w/ 60032, and mid-1973 w/ 60032. What I’m thinking is that the 60050 head was a replacement on my late-1972 engine—ie. Not original to that engine.

Thx for any info u might have. I’m trying to keep my 1972 rig original…

 

[timmyisinthewell]

I think I'm seeing three different p/n's for the year 1972 depending on the month of build. I just don't know enough to comment on the p/n's you posted. The microfiche pic covers the US and Canadian markets for the period from 03/69 to 07/80.

 

[65swb45]

I think I'm seeing three different p/n's for the year 1972 depending on the month of build. I just don't know enough to comment on the p/n's you posted. The microfiche pic covers the US and Canadian markets for the period from 03/69 to 07/80.

View attachment 3859754

I was going to tag YOU on this, just because you have ready access to the microfiche. Thank you!

Unfortunately, the microfiche numbers don’t match the original casting numbers, so we’re still left to my anecdotal observations.

 

[65swb45]

So I am now starting to wonder… what engine years did the 60050 head come from? I ask b/c I have 3 extra 1F engines w/ the following heads: 1969 w/ head 60030, mid-1971 w/ 60032, and mid-1973 w/ 60032. What I’m thinking is that the 60050 head was a replacement on my late-1972 engine—ie. Not original to that engine.

Thx for any info u might have. I’m trying to keep my 1972 rig original…

The 60050 should have a third hole under the fourth rocker arm stand, making it an F.5 head.

 

[timmyisinthewell]

So, my 72 has a crack in the water jacket on cylinder 5 valve area (pic). Its casting is 60050. I have an extra rebuilt head with casting 60030 that came off a 1969 engine. Can I replace it with this one? Thx.

View attachment 3843666

Where would one find these casting numbers?

 

[65swb45]

Where would one find these casting numbers?

They are on the driver’s side, topside, between the second and third head bolt.

 

[POPO AGIE]

I have a 155F head.

The last time the motor ran was in 1991 and I removed to get the motor to turn over.

 

[Boynepark76]

I think I'm seeing three different p/n's for the year 1972 depending on the month of build. I just don't know enough to comment on the p/n's you posted. The microfiche pic covers the US and Canadian markets for the period from 03/69 to 07/80.

View attachment 3859754

Wow thx for all the help! The microfiche is awesome; it coincides with what I’m seeing on the different 1F engines I have. I have a 74 engine at home and will have to see what the head casting is on it. Looks like the head on my 72 got replaced with a 74 head.

So, I’m thinking the original head was a 60032 which I just pulled yesterday off a donor machine. I’ll take it to the shop and have them rebuild this head! Thanks again guys!

 

[timmyisinthewell]

Because I just had to know and thanks to the information on head number location from @65swb45, I went out to the garage and grabbed some GUNK and a wire brush. I removed decades of dirt and grease to reveal a number 60032. I am the second owner of a Jan. '72 FJ40 that I bought in Oct. '78. It was last driven and liscenced in early '83 and has been mostly in pieces in covered storage ever since.

 

[Living in the Past]

So I am now starting to wonder… what engine years did the 60050 head come from? I ask b/c I have 3 extra 1F engines w/ the following heads: 1969 w/ head 60030, mid-1971 w/ 60032, and mid-1973 w/ 60032. What I’m thinking is that the 60050 head was a replacement on my late-1972 engine—ie. Not original to that engine.

Thx for any info u might have. I’m trying to keep my 1972 rig original…

I was going to tag YOU on this, just because you have ready access to the microfiche. Thank you!

Unfortunately, the microfiche numbers don’t match the original casting numbers, so we’re still left to my anecdotal observations.

Looking up cylinder head online I've numbers do not match the casting. Believe the difference is replacement heads are not sold bare.the cylinder. The part numbers I find includes plug
, bushings and plugs. Does not show a bare head number.

They are on the driver’s side, topside, between the second and third head bolt.

While not as easy to identify there is a date of manufactured on the left side of the head as well.