Best early Factory Corvette
Originally Posted by GonneVille
Originally Posted by SSsuperchargedEi
zl1 is an all aluminum 427 that was only an option from 67-69... known to push in the neighborhood of 530-560 at the crank, but modesly rated at something like 425
The all-aluminum 427 was the L88. Both of them turned out in excess of 500hp, but shared a GM rating of 425, 10hp below the Tri-power 427. GM pulled this bit of skullduggery to keep their most powerful engines to their factory racing teams.
Keep in mind that those numbers are the GM-inflated gross-hp rating. In truth, the L88 only turned out around 420 net hp. The Tripower didn't even mange to crack 350 net-hp.
69 was the rarest year for the zL1, only something like two exist
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