Cylinder head ID

[David70FJ40]

Can someone tell me if this cylinder head is a F.5 or a 2F. The photos of the casting numbers are all I can find.

I would also like to know if it can be used on my F engine from my 1970 FJ40.

If it can be used on my FJ40, are there any modifications? I know the studs are larger but other than that I am at a loss.

I have trouble with the #2 cylinder valves and my thoughts are to have this head rebuilt and install it in place of the original head and not have the truck down for a month while I wait for the shop to complete the overhaul.

 

[brian]

It's a later f head that for sure.

 

[Living in the Past]

Oil to the rockers is wrong. The 70 is fed by a copper tube directly to the rocker assembly. 74+ is fed directly by a passage in the head into a rocker assembly support.

 

[David70FJ40]

Oil to the rockers is wrong. The 70 is fed by a copper tube directly to the rocker assembly. 74+ is fed directly by a passage in the head into a rocker assembly support.

Can I reuse my rockers and use the oil feed tube?

 

[73FJ40]

This 2F head has a totally different oiling system to the rockers. The 2F engine feeds oil to the rockers through an integral gallery in the engine block into the head, which feeds the oil to the rocker shaft through one of the rocker tube supports.

Your F engine uses a thin copper tube to accomplish the same function.

Oops! See Mark's observations, below.
I believe it would be a challenge to adapt the F engine to the 2F head. You'd have to run the copper tube out of the lifter cover, up and into the valve cover, and attach it to a rocker tube from the F engine.

 

[65swb45]

This 2F head has a totally different oiling system to the rockers. The 2F engine feeds oil to the rockers through an integral gallery in the engine block into the head, which feeds the oil to the rocker shaft through one of the rocker tube supports.

Your F engine uses a thin copper tube to accomplish the same function.

I believe it would be a challenge to adapt the F engine to the 2F head. You'd have to run the copper tube out of the lifter cover, up and into the valve cover, and attach it to a rocker tube from the F engine.

Not necessarily so Kevin. Toyota often made successive parts so that they could be used in earlier applications. For example, there are many F145 blocks that are still drilled for the pivots and spring anchors of F135 rod linkage even though the F145 used cable linkage. And even after the drilling stopped, the bosses were often retained retained in the casting.

Another example: Early 2Fs still have a boss on the driver’s side directly over the oil galley, where the regulator was mounted on the pre-74s.

If you look very closely at the pic of David’s head, you will see a notch in the passengers side of the valve cover lip, and the corresponding hole beneath it where the rocker tube needs to pass through the head.

 

[David70FJ40]

The oiling tube comes up between the 3rd and 4th cylinders and attaches to the rocker shaft. If I reuse the original rockers and shaft, then the oiling should remain the same. Is that a fair statement Mark? The only unknown I know is if the rocker shaft and supports will fit the cylinder head install points.