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Old 02-15-2016, 07:46 PM   #23
davepl
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Join Date: Aug 2006
Location: Redmond, WA
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Re: Factory big block trucks?

Quote:
Originally Posted by Mike C View Post
My guess is you are seeing the limits of 350 cfm on a 400 cubic inch motor. The 2 bbl engine is just out of fuel at a much lower rpm than the 4 bbl motor. And based on GM's ratings, to the tune of 50 hp.
That was my guess as well. The 350 just squeaks by with the 2bbl, but the 396 taps it out.

I bet that's some seriously crisp throttle response though!
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1970 GMC Sierra Grande Custom Camper - Built, not Bought
1969 Pontiac 2+2 427/390 4-speed Coupe
1969 Pontiac 2+2 427/390 4-speed Convertible
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