318 with x-heads?

70aarcuda said

the X should be between the spark plugs on the outside of the heads...


seen alot of X heads...seen alot of 318s...

but 318 did not come from the factory with X heads

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318 is stamped on the the block and a X on the out side of the head...Yep! Just asking has anyone seen this before. I'm sorry for not relaying that I know its not original. Just thought it was odd.