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fuel line size for a 331 fuel line size for a 331

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03-01-2005, 07:17 PM   #1 (permalink)
gjz30075
 
Join Date: Apr 2004
Posts: 108
fuel line size for a 331
Hi all,
I'm building a 331 with AFR 185 heads, a 650 cfm carb (type/brand unknown at this time), XE274HR Comp cam (.515 lift, I believe), Edlebrock Air Gap manifold and I'm told I'm going to have to upgrade the fuel line from 5/16" to 3/8". I'm thinking this might be overkill. Should I upgrade?
Thanks.
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03-01-2005, 07:38 PM   #2 (permalink)
BLACK65FORDFALCON
 
Join Date: Jul 2002
Posts: 569
fuel line size for a 331
No 3/8 is not overkill, It will be perfect for your combo. Make sure you go 3/8 right from the tank pickup to the carb.
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03-01-2005, 09:05 PM   #3 (permalink)
FoMoCo
 
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fuel line size for a 331
What he said[img]/phpBB/images/smiles/icon_wink.gif[/img]
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03-01-2005, 09:22 PM   #4 (permalink)
rbohm
 
Join Date: Jun 2002
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fuel line size for a 331
[img]/phpBB/images/smiles/icon_cool.gif[/img]in your case 1/2" line would be overkill, 3/8" is fine.
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03-02-2005, 02:09 PM   #5 (permalink)
tonys10sec306
 
Join Date: Nov 2002
Location: maryland
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fuel line size for a 331
nope
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03-02-2005, 02:29 PM   #6 (permalink)
blkfrd
 
Join Date: Sep 2001
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fuel line size for a 331
Don't bother
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03-02-2005, 09:02 PM   #7 (permalink)
dtitus
 
Join Date: Aug 2003
Posts: 71
fuel line size for a 331
Fuel line diameter depends upon horsepower. General rule of thumb is 5/16" is adequate for about 300 hp, 3/8" for 400-500 horses and 1/2" above that level.
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