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What's the difference?
I would like to know what the difference is between 5 heads and 5A heads. I know the 5A is for unleaded fuel, but are they different other than that?
Same question for 7 and 7A
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Me 
2000 Alero running 14's
1985 Delta 88 w/1968 350 rocket
2005 Nissan Altima (her's)
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