question: 11th month 78 'X' cast 308 head. what were they used for?

[MR-POIDA]

re head casting

i have a 202 head with what looks like a factory X cast into the back of it? any ideas?

also a mate has a 308 and the block is cast 308x any ideas on that?

 

[Hangman]

What's the engine number prefix on the block and what's the head part number?

 

[SL/ENUT]

I have a set of X cast heads in my VB now. They have large valves, maybe been fiddled with though. What i have been told, they maybe a no frills 253/308 heads or hipo 308 heads, depending on part numbers.

 

[ari666]

x's are special to 253's, no? X stamped rods are definitly from a 253