Re: L-78 engine Birth date
GM also had a marketing dilema. The L78 was originally listed as making 425 hp at 6400 rpm in 1965. Then the L72 came along and that made 425hp at 5600 rpm. So the L78 was dynoed and became a 375hp motor at 5600 rpm. This arrangement gave Chevy two distinct levels of hp they could offer the public.
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Dean
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