Anybody else running 5/16 fuel line to 496? - Chevelle Tech
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post #1 of 36 (permalink) Old Sep 5th, 17, 6:54 PM Thread Starter
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Rob
 
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Anybody else running 5/16 fuel line to 496?

Never checked my fuel line size all these years, today I was underneath the rear end doing some maintenance and figured I'd check fuel line diameter seeing it was staring me in the face, well its only a 5/16th line!!!
thought it was 3/8".....anybody else running the same size line going to 496? Car runs good so I don't really want to change it if not necessary!
Fuel pump is Holley mechanical 12-454-11, 110 gph
Thanks,Rob

68 Beaumont 3900#
496 ,10.5 comp, Brodix RR 270
Bullet Custom HR 234/[email protected]
Rpm Airgap, Holly 950 HP Street
1 3/4 Flowtech Headers
TH400, Freakshow 9.5 3500 stall, 3.55 12 bolt
Best 60ft 1.62
Best 1/8 [email protected]
Best 1/4 [email protected]


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post #2 of 36 (permalink) Old Sep 5th, 17, 7:04 PM
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Re: Anybody else running 5/16 fuel line to 496?

I am surprized that size line has worked so well. Your car runs good.
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post #3 of 36 (permalink) Old Sep 5th, 17, 7:05 PM
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Re: Anybody else running 5/16 fuel line to 496?

bottom 11s at 120 on a 5/16 line. Yikes. Got pistons?

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Last edited by Tom Mobley; Sep 6th, 17 at 12:29 AM.
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post #4 of 36 (permalink) Old Sep 5th, 17, 7:09 PM
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Re: Anybody else running 5/16 fuel line to 496?

5/16'6...why?!

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post #5 of 36 (permalink) Old Sep 5th, 17, 7:16 PM Thread Starter
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Rob
 
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Re: Anybody else running 5/16 fuel line to 496?

Quote:
Originally Posted by Tom Mobley View Post
boittom 11s at 120 on a 5/16 line. Yikes. Got pistons?
I checked plugs ,no signs of detonation, not running lean either! only spin to 6000 if that makes a difference.

68 Beaumont 3900#
496 ,10.5 comp, Brodix RR 270
Bullet Custom HR 234/[email protected]
Rpm Airgap, Holly 950 HP Street
1 3/4 Flowtech Headers
TH400, Freakshow 9.5 3500 stall, 3.55 12 bolt
Best 60ft 1.62
Best 1/8 [email protected]
Best 1/4 [email protected]


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post #6 of 36 (permalink) Old Sep 5th, 17, 7:21 PM Thread Starter
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Rob
 
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Re: Anybody else running 5/16 fuel line to 496?

Ok, by the sounds of it so far I think I better do a fuel line up grade...might be pushing my luck!
Thanks, Rob

68 Beaumont 3900#
496 ,10.5 comp, Brodix RR 270
Bullet Custom HR 234/[email protected]
Rpm Airgap, Holly 950 HP Street
1 3/4 Flowtech Headers
TH400, Freakshow 9.5 3500 stall, 3.55 12 bolt
Best 60ft 1.62
Best 1/8 [email protected]
Best 1/4 [email protected]


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post #7 of 36 (permalink) Old Sep 5th, 17, 7:24 PM
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Re: Anybody else running 5/16 fuel line to 496?

You are running on the edge

64 Chevelle 496
64 F100 Street Rod with BBC /Chevy trapped in a ford body
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post #8 of 36 (permalink) Old Sep 5th, 17, 7:25 PM Thread Starter
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Rob
 
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Re: Anybody else running 5/16 fuel line to 496?

Can anybody recommend a good fuel line kit to install, looks like its not an easy job!

68 Beaumont 3900#
496 ,10.5 comp, Brodix RR 270
Bullet Custom HR 234/[email protected]
Rpm Airgap, Holly 950 HP Street
1 3/4 Flowtech Headers
TH400, Freakshow 9.5 3500 stall, 3.55 12 bolt
Best 60ft 1.62
Best 1/8 [email protected]
Best 1/4 [email protected]


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post #9 of 36 (permalink) Old Sep 5th, 17, 7:31 PM
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Re: Anybody else running 5/16 fuel line to 496?

Quote:
Originally Posted by 68Beau View Post
Can anybody recommend a good fuel line kit to install, looks like its not an easy job!
It is easy. Just remove the old one then bend the new line to match as best you can. Then install it.

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post #10 of 36 (permalink) Old Sep 5th, 17, 7:49 PM Thread Starter
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Rob
 
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Re: Anybody else running 5/16 fuel line to 496?

What's the minimum size you guys would recommend!

68 Beaumont 3900#
496 ,10.5 comp, Brodix RR 270
Bullet Custom HR 234/[email protected]
Rpm Airgap, Holly 950 HP Street
1 3/4 Flowtech Headers
TH400, Freakshow 9.5 3500 stall, 3.55 12 bolt
Best 60ft 1.62
Best 1/8 [email protected]
Best 1/4 [email protected]


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post #11 of 36 (permalink) Old Sep 5th, 17, 7:51 PM
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Re: Anybody else running 5/16 fuel line to 496?

1/2". Put a RobbMc pick up in as well, unless you have a sumped tank.
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post #12 of 36 (permalink) Old Sep 5th, 17, 8:28 PM
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Re: Anybody else running 5/16 fuel line to 496?

Quote:
Originally Posted by 68Beau View Post
Can anybody recommend a good fuel line kit to install, looks like its not an easy job!
Its not easy
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post #13 of 36 (permalink) Old Sep 5th, 17, 8:37 PM
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Re: Anybody else running 5/16 fuel line to 496?

put a fuel pressure guage on it and make a pass. it might scare you
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post #14 of 36 (permalink) Old Sep 5th, 17, 8:46 PM
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Re: Anybody else running 5/16 fuel line to 496?

Quote:
Originally Posted by 68Beau View Post
Can anybody recommend a good fuel line kit to install, looks like its not an easy job!

I have heard that you can not put a one piece line in without jacking the body, but dont have personal experience. If out do some searching in the forums I bet you will find a lot.


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post #15 of 36 (permalink) Old Sep 5th, 17, 9:31 PM
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Re: Anybody else running 5/16 fuel line to 496?

5/16" fuel line, Holley Blue pump, Fram 90 GPH fuel filter. 10.3:1 383 SBC. Started having fuel supply/pressure issues in the 1/8 th mile at around 450 HP. Mid 7's at 93 MPH in 1/8th @ 3610 lbs.

-10 braided line, Mallory Comp. 500 filter and Comp 140 pump worked well at ~730 HP and 6.20's @ 111 MPH in the 1/8 th @ 3650 lbs.

Same line and filter with Magnafuel 500 GPH pump now.

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