GM rockers that were not long slot had no markings only rhe long slot rockers were marked. Solid lifter big blocks up to 69 had L and after 69 they had a H. I do not believe there was any difference in the 2
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69 RS SS L78 conv
69 RS SS ZL1
69 L78 Chevelle conv
69 L78 Nova
69 L34 Nova
67 SS Chevelle
73 Trans Am
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