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Old 09-08-2021, 07:45 AM   #1
don t. - 72gmc
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Location: harvard, il. USA
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Gas lines

This dummy can't read a ruler(smile).
Bought new 5/16" gas lines, gottem Friday.
Compared old to new.
New are visibly smaller ID vs old.
Internet vendor policy on pre-bent lines = no return.

For as long I have the truck it will be stock.
400BB garage king.
Would you use 5/16?

Thanks,
don t.
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Old 09-08-2021, 08:10 AM   #2
kaycee
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Re: Gas lines

I would go 3/8" if it were me ,I have ran 3/8 on my 327 that had 5/16 they needed replaced any ways so why not.
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Old 09-08-2021, 09:49 AM   #3
sick472
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Re: Gas lines

It's a fair amount of work to risk fuel starvation with 5/16" lines just to have to possibly redo it later. I swapped my old 5/16" line out when I went from a stockish 350 to a 400. All is good. I'd go 3/8" too.
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Old 09-08-2021, 12:07 PM   #4
body bolt
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Re: Gas lines

GM had a reason to use 3/8" on V8s when the could have saved a fraction of a cent by using the same part across the board.
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Old 09-09-2021, 07:55 AM   #5
don t. - 72gmc
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Re: Gas lines

All the replies make a ton of sense.
It's just busts my tookus I couldn't read a dang ruler(grin).

Thanks again...have fun...don t.
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Old 09-09-2021, 08:54 PM   #6
lutronjim
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Re: Gas lines

Sonetimes hard to get diameter with ruler - especially when your old like me. I use an open end wrench when in tight quarters.
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