FS: 121 Cylinder Head from ‘72 Tii

[Conserv]

The only point here with which I’d quibble is the intake valve size. I believe the 46mm versus 44mm difference is a function of time, not model. Injected and carbed cars got the 46mm-intake 121 heads. Find a late 1971 or early 1972 carb head — fuel pump boss fully drilled — and it will have 46mm valves. Thus, there are early 121 heads (44mm) and late 121 heads (46mm). When did the changeover occur? I don’t know. E12 heads, of course, were all 46mm, and they superseded the 121 heads during the 1972 model year.

 

Regards,

 

Steve

 

Edited September 29, 2019 by Conserv

[Pouya]

20 minutes ago, Conserv said:

The only point here with which I’d quibble is the intake valve size. I believe the 46mm versus 44mm difference is a function of time, not sub-model. Carbed and injected cars got the 46mm-intake 121 heads. Thus, there are early 121 heads (44mm) and late 121 heads (46mm).  When did the changeover occur? I don’t know, but perhaps 1970 or 1971. E12 heads, of course, were all 46mm.

 

Regards,

 

Steve

 

As always good points!

 

I can get a set of 121 pistons 10:1 compression for about $500.

e12 9.5:1 pistons cost about $1000 and the block will have to be sleeved. 

E12 is a better head than 121 but the pistons are slightly lower in compression so it’s a close call. 

 

[kbmb02]

10 hours ago, Pouya said:

E12 is a better head than 121 but the pistons are slightly lower in compression so it’s a close call. 

 

Why do you say the E12 is better? Better, how? (curious, mostly..) -KB

[Pouya]

42 minutes ago, kbmb02 said:

 

Why do you say the E12 is better? Better, how? (curious, mostly..) -KB

I’ve heard it follows better!?

[Brandon]

^
The Tii cylinder head is still available for sale.

[jgerock]

9 hours ago, Brandon said:

^
The Tii cylinder head is still available for sale.

Pm reply sent.