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Originally Posted by Poncho60
Thx for the great replies/info. Much appreciated. Did the low CR heads have any external identity features different than the high CR ones. Anyone know?
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I assume that they have the codes cast in same as the later heads did. From Wallace Racing the casting numbers (536109) seem to be the same as do the 2 digit code (69)
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1960 389 215-345HP 536109 1.88/1.60 69
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