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Exactly. Happens every now and then… guys take the time, not to help in a constructive way, but to make some smart a$$ comment. So my advice to you is STFU!! We are all in different stages in the learning and know how process -of the Mopars, in this case. And don´t for a second believe, just...

Do you happen to know anything about an X-head with 1.78X1.50 valves?

Yes, this is what I go with also when bench racing.´70-72 J-heads (915) in different configurations. Now, there are only six different SB-head casting number from ´64 till late sixties, (1.78X1.50" and 2.02X1.60 valves) when MOPAROFFCIAL noticed this X-heads (witch I absolutely believe is a...

Well to me it´s not likely there are two different X-head castings, we surly should have heard about that. Not that I have heard everything about SB Heads, but still... Since the 1.78/1.50” valves was a 273/318 thing, maybe Chrysler took what was available when they ran out of heads, and simply...

:) yes Ma Mopar... remember the cast#:s?

Yes, well maybe this X calls for some more explanation. It is not that the X means you can use them on any engine… The X refers to, as seen in this picture below, the X in the casting. The X-head was found only in 1968 and 69 on the Mopar 340 engine. Some early 1970 engines had them too as I...

I see an "X". Congrats...

Dusterfreak, you have a PM.