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Old 12-18-2008, 10:07 PM   #1
into69z
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1969 big block fuel line size

I recently installed a 468 big block in my 69 c-20, and my question is is there a dirrerence in the size of big block fuel line from the tank to the pump vs a small block? I saw an ad that says 3/8 was the size for factory big block but I can't back it up. I also installed a new rearend from a 1986 3/4 ton truck that has a 3:23 gear. This is a 14 bolt but not the heavy duty (dana 70) type-anyone run this rearend with any problems? Thanks Steve
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Old 12-18-2008, 10:17 PM   #2
caminokid
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Re: 1969 big block fuel line size

Quote:
Originally Posted by into69z View Post
I recently installed a 468 big block in my 69 c-20, and my question is is there a dirrerence in the size of big block fuel line from the tank to the pump vs a small block? I saw an ad that says 3/8 was the size for factory big block but I can't back it up. I also installed a new rearend from a 1986 3/4 ton truck that has a 3:23 gear. This is a 14 bolt but not the heavy duty (dana 70) type-anyone run this rearend with any problems? Thanks Steve
Mine is a 3/8th line.
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Old 12-19-2008, 12:48 AM   #3
71 super
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Re: 1969 big block fuel line size

3/8 ths here as well, but I think that was common for all V8 trucks, while 6's got 5/16 lines
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Old 12-20-2008, 04:19 PM   #4
PICKMUP
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Re: 1969 big block fuel line size

3/8s was original on 350 & BBs and should feed your engine fine...IF there are no restrictions. Check the fuel line from tank to carb to make sure there are no kinks or crimped spots. Look inside all your fittings, especially if any are non-stock. Some of these fittings & fuel blocks are too small inside. Check the fuel sock inside the tank, too.
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Old 12-21-2008, 12:18 AM   #5
into69z
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Re: 1969 big block fuel line size

thanks-never thought of the fuel sock in the tank..
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67 Camaro
96 Impala ss-sold
04 hybrid Honda-saving gas for the blue truck!:
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