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A stock radiator will support a 700 HP fully built N/A LSx engine....why do you need an aftermarket radiator? My 427ci runs cool as a cucumber, why are people putting in aftermarket radiators.......I don't understand....
Gto plastic tanks are known to leak for no reason. To the OP, congrats on the nice upgrade
Oh, I didn't know those cars had issues with leaking. My plastic factory rad is like 9 years old. Maybe they changed something with the GTO's. GM has been known to **** good things up royally......lol