302 heads stamped with J/R under the valve cover?

85_SS_302_Coupe

it sucks (I know) to be on the receiving end
15 Year Member
Nov 11, 2003
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Northern KY
Anyone know what these might be? I've never seen stock heads with this stamping before. Also on the other end there's a sort of upside-down tear drop with dots all around it.
 
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