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Old 11-03-2008, 11:26 AM   #1 (permalink)
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Hi everybody,
I need to order a new fuel line (tank-to-pump) for my '65 hardtop. The engine is a mildly modified 289 opened up to about 310 cubes (302 crank, .060 over) with large valve ported heads, single plane intake and 600 cfm Holley. Would there be any advantage or disadvantage to using a 3/8" 65 Shelby line over the stock 5/16"?
Thanks!
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Old 11-03-2008, 12:27 PM   #2 (permalink)
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IMHO 5/16 will serve you fine.
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Old 11-03-2008, 01:26 PM   #3 (permalink)
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Unless you change everything in line to 3/8 it won't benefit from changing the lines.

This goes sender, lines, pump, to carb, carb inlet.

Btw, the 65 street Shelby used the same 5/16 as the rest of the line up.

Ford switched to 3/8 on the 67 390 and 3/8 on both small block and big block in 68.
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Old 11-03-2008, 01:35 PM   #4 (permalink)
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Both of my 66s needed 3/8 lines to keep from starving the carb. during hard acceleration. I vote you go to the 3/8 now or you will need it latter.

Larry
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Old 11-03-2008, 02:03 PM   #5 (permalink)
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5/16" line with a stock fuel pump. 347, revs to 6200 no problem, never any fuel starvation.
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Old 11-03-2008, 02:09 PM   #6 (permalink)
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Quote:
Originally Posted by pprince
Unless you change everything in line to 3/8 it won't benefit from changing the lines.

This goes sender, lines, pump, to carb, carb inlet.

Btw, the 65 street Shelby used the same 5/16 as the rest of the line up.

Ford switched to 3/8 on the 67 390 and 3/8 on both small block and big block in 68.
Thanks everybody!

I looked at Mustangs Unlimited's listing for the 3/8" 65 Shelby fuel line and it does list it as GT-350"R"; so your right, the street versions did have 5/16". I figure if a Street GT-350 can run with a 5/16", so can I.

As a side note, does anyone have any tips on how to get the large radius shipping bend out of the new fuel line with out kinking it?

Thanks again!
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Old 11-03-2008, 02:50 PM   #7 (permalink)
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If your replacing the line anyway I would go with the 3/8ths..Gives you a little insurance for the future even if you don't need it right now..Remember the street version of the shelby's were only an optimistic 270 hp..It is very easy to make more power than that with todays parts..
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Old 11-03-2008, 03:19 PM   #8 (permalink)
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Quote:
Originally Posted by frdnut
If your replacing the line anyway I would go with the 3/8ths..Gives you a little insurance for the future even if you don't need it right now..Remember the street version of the shelby's were only an optimistic 270 hp..It is very easy to make more power than that with todays parts..
I agree.

Period test results show the small block Shelby's only turning high 14's. It is not hard to do much better than that.
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Old 11-03-2008, 05:24 PM   #9 (permalink)
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[quote=Ponyboy289]
Quote:
Originally Posted by pprince
.............
As a side note, does anyone have any tips on how to get the large radius shipping bend out of the new fuel line with out kinking it?

Thanks again!
I just laid mine down on the floor and "walked" on the curve. It straightens out easily bit by bit. If you tried to bend it straight at the bottom of the "U" I can see it kinking.

Z. Ray


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Old 11-03-2008, 05:29 PM   #10 (permalink)
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I just bought a 3/8" line for my '67 289. It straightened out just fine - no issues. I did mine on the floor, a bit at a time.
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Old 11-03-2008, 05:48 PM   #11 (permalink)
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I just tried the walk it out on mine about an hour ago, worked fine.
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Old 11-04-2008, 11:19 AM   #12 (permalink)
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Thanks for all the advice! I went ahead and ordered the 3/8" line. I don't think the engine I'm installing will need it right now, but I have aspirations of a 351W in the future.

I'll try the "walk-out" method when it arrives.

Thanks again!
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Old 11-04-2008, 11:55 AM   #13 (permalink)
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I've got a 351W with 320 RWHP. I red line it at 6200 and have never had a fuel starvation problem using the stock 5/16" line and stock fuel pump.
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Old 11-04-2008, 02:18 PM   #14 (permalink)
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I'd recommend upgrading to 3/8" throughout.

The numbers work out to a 5/16" line having 69% of the volume capability of a 3/8" line. Personally, I switched to an electric fuel pump in the tank AND a 3/8 fuel line. I should be good to go for anything that will fit under the hood.

Phil
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Old 11-04-2008, 04:47 PM   #15 (permalink)
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Where do you get a prebent line to go from the pump to the carb?
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