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Fuel pump 427ci BigBlock, which NPT?

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Old Jun 23, 2017 | 11:36 AM
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Default Fuel pump 427ci BigBlock, which NPT?

Hey!
Need to replace the fuelpump of my L36 427ci. I can choose 1/4" or 3/8" for in- and outlet.
Do anybody know the stock size?
And are 8 psi and 110 gph too much for a 489ci stroker?
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Old Jun 23, 2017 | 04:06 PM
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Neither. Factory pump would have 3/8 inverted flare (5/8 18). You can get an adapter fitting that would go from 3/8 male npt to female 3/8 inverted flare
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Old Jun 23, 2017 | 04:08 PM
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Can you help me to find this adapter at summit?
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Old Jun 23, 2017 | 04:09 PM
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Also the 110 gph is fine, the 8 psi would probably be tolerated by a holley, definitely not by a qjet.
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Old Jun 23, 2017 | 04:14 PM
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Got it:
https://www.summitracing.com/int/parts/edd-124660

Is this the correct one?
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Old Jun 23, 2017 | 04:15 PM
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​​​​​​​https://m.summitracing.com/parts/edd-124660
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Old Jun 23, 2017 | 04:16 PM
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Beat me to it. Yes
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Old Jun 23, 2017 | 04:19 PM
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Thank you!
About the fuel pump. Stock gph is about 30. I have a 489ci stroker and need a pump with more gph. The aftermarket are also available with 80gph and 6 psi. I think the 80 gph are enough. So would the 6 psi be better for the Q-jet?
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Old Jun 23, 2017 | 06:10 PM
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No problem.

As for GPH, don't get me wrong, most of us, myself included tend to go overboard on fuel system.

While your 489 is probably a bit thirstier than my 454, Id be willing to bet 80 gph would feed it. 6 psi "should" be ok with a quadrajet.

I have a feeling you are looking at the edelbrock. Check out this video and you will see that is the better choice.

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