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andyleonard

WTB Good 121 Head for 9.3 Bathtub Pistons.

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19 hours ago, JOHN BOY said:

I have a complete head I replaced mine with a rebuilt All I know it is stamped 74 on the head.

 

In the vicinity of the casting date, you will find the head’s identification, e.g., 118, 121, 121TI, E12, E21. A 1974 engine originally came with an E12 head. 121 and 121TI  heads were phased out in the approximately the spring of 1972, but replacement 121 heads were cast into the 1980’s, perhaps even later. A casting date alone does not identify the head; you also need the head type.

 

Below is the April 1976 original head, an E21, from my ‘76, illustrating an example of head type markings.

 

Regards,

 

Steve

 

B45468CF-DE3A-42A3-9C73-119E94905265.jpeg

Edited by Conserv
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14 hours ago, Conserv said:

 

In the vicinity of the casting date, you will find the head’s identification, e.g., 118, 121, 121TI, E12, E21. A 1974 engine originally came with an E12 head. 121 and 121TI  heads were phased out in the approximately the spring of 1972, but replacement 121 heads were cast into the 1980’s, perhaps even later. A casting date alone does not identify the head; you also need the head type.

 

Below is the April 1976 original head, an E21, from my ‘76, illustrating an example of head type markings.

 

Regards,

 

Steve

 

B45468CF-DE3A-42A3-9C73-119E94905265.jpeg

 

Don’t forget the elusive 121T head! This one cast at midnight Dec 32nd in the apocalypse year of 79, thus no month code???

51B56042-6303-4FEB-B6A7-67071DC0F547.png

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23 minutes ago, Artboakrill said:

 

Don’t forget the elusive 121T head! This one cast at midnight Dec 32nd in the apocalypse year of 79, thus no month code???

51B56042-6303-4FEB-B6A7-67071DC0F547.png

 

For turbos only, if I recall, Art? But requiring additional combustion chamber modifications before it could go on a turbo.... Huh?

 

Best regards,

 

Steve

 

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