Is it the sticker on the air cleaner????

33IMP said
Neither of those is remotely a high performance engine.
Now the 270hp or 283hp 283 IS a perform!nice engine.

So, I guess it is factory equipment that makes any engine a performance engine. There was a 210 horse 327, and a 375 horse 327. One of these is not the same as others.
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1982 Dodge trucks..... 225 1bbl = 95 net HP, 225 2bbl = 100 hp. Factory equipment up'd it 5 hp, so technically, the super six is a performance engine.