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1971 390 specs........?

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Old Feb 14, 2003 | 12:40 AM
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Question 1971 390 specs........?

What are the HP and CR ratings for a stock 1971 390 2bbl motor...?
 
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Old Feb 14, 2003 | 02:24 AM
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1971 390 specs........?

The specs I have are 266HP@4600 and 390 ft/lbs@2600. These are what I pulled off a web page so I can't verify the accuracy. It sounds about right though. I thought the power was a little less and the torque was a little more.
 
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Old Feb 14, 2003 | 02:29 AM
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1971 390 specs........?

255HP @ 4400rpm

(that's the brake or gross hp, the net hp is on the rating plate.)

8.6:1 CR

How about torque?

376ft.lb. @ 2600rpm (gross rating again)

Barry
 
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Old Feb 14, 2003 | 02:37 AM
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1971 390 specs........?

I would go with Barry's specs on this one. Probably from a much more reliable source.
 
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Old Feb 14, 2003 | 02:43 AM
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1971 390 specs........?

Whoops, looks like we stepped on each other, I should refresh more often!

These specs are from the '71 Truck service spec. book and the dealer's brochure agrees.

Those specs are close to the '70 car 390.

Hey, did you know that the '71 390 for the cars and trucks are the same? That's why I remember seeing the T manifolds on cars,they must have been '71's, it's all making sense now.

Barry
 
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Old Feb 14, 2003 | 03:04 AM
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1971 390 specs........?

Originally posted by BBB
Whoops, looks like we stepped on each other, I should refresh more often!

These specs are from the '71 Truck service spec. book and the dealer's brochure agrees.

Those specs are close to the '70 car 390.

Hey, did you know that the '71 390 for the cars and trucks are the same? That's why I remember seeing the T manifolds on cars,they must have been '71's, it's all making sense now.

Barry
Like I said a much more reliabe source. I didn't know that about the cars and trucks having the same specs. It does definitely explain the T manifolds.
 
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Old Feb 14, 2003 | 10:22 AM
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1971 390 specs........?

I knew the '71 car and truck 390 used identical cams but looking closer, everything is identical. About the only differences are the carb, air cleaner, exhaust manifolds and oil filter adapter.

Interesting!
 
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