identifying odd or even fire

blakey

Newbie
I am new to the forum or I should say I have browsed but not posted. At the risk of asking a dumb question...
I am trying to identify my block as odd or even fire.
I have a block casting number of 1254083 and head casting of 1257051. From what I understand this could either be a 1977 or 78. I do not know the crank forging number.
I am trying to determine if this is an odd or even fired motor and as I understand it in 1977 it could be either odd or even, 1978 would be even fire.
How do I determine conclusively if this is an odd or even fire block without disassembling to look at crank?
Thanks,
Bob
 
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