Samll block head ID?

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Airfix

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Cloverdale BC Canada
I have a pair of heads with "O" cast into them near the front plug hole drivers side and rear plug hole passenger side, any idea of the specs? valve sizes etc, size of engine originally installed on, 318, 340, 360?
Thanks.
 
The identifying numbers are cast in a intake runner (under the valve cover).
 
I'm familiar with the X and J heads but hadn't heard of the "O", guess I'll have to pull a valve cover and decode.
 
I once heard that "O" heads were canadian ones but I could be wrong. All "O" heads are the same as "J" heads.
 
O heads are generally the same as the J heads. Should be a 915 casting.

I have/had 2 1970 340 cars that have these heads.
 
Thanks for the info, just trying to figure out if they are correct for my 70, should have the 2.02 intake valves.
Keep hearing about X and J's but never heard of O's before I looked yesterday..
 
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