Thread: L78 vs COPO in 69 ('real' engine horsepower ratings)
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Old 07-31-2023, 08:55 PM
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Post L78 vs. L72
We recently 'freshened' the engine for our 68 L78 Nova...made 425hp at 6,000 rpm....no trick parts.

I would imagine a blue-printed short block, performance valve job, distributor & carb tuned correctly, would get you close to 450hp.

As for the L72...they were briefly rated 450hp before the drop to 425hp. Same things would apply and likely get you well north of 450hp.

-wilma
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