Thread: Horsepower difference ?
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Old 01-17-2024   #4
rkreigh
 
Join Date: Jan 2004
Location: Alex VA
Posts: 1,080
Default Re: Horsepower difference ?
improved intake port alignment. Bit better heads and cams, improved exhaust and header/cats.

405 hp blocks also had 4 bolt mains and all of them were made in 1993
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