an AN question
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Senior User
Joined: Apr 2012
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From: South Texas
an AN question
when talking about -(6,8,10) AN's in regards to the carburetor and the rest of the fuel system, whats better -6,-8 or -10? Does the whole system have to be the same or does it gradually decrease or increase? For everday use and some 4x4ing what should I be looking for?
Cargo Master
Joined: Apr 2003
Posts: 2,408
Likes: 5
From: Parkesburg PA
AN Numbers relate to their size. An AN-8 is actually 8/16's in diameter or 1/2". AN-10 is 10/16's or 5/8".
It's commonly called a dash 8 line or dash 8 fitting, you don't have to say AN dash 8. And AN stands for Army/Navy as it was invented before the airforce existed. The development comes from the military where a dependable, solid connection is desired. Also, the flare is 37* vs SAE's 45* flare so the two are not compatible. You will also need a separate flaring tool for AN hardline. They are all single flare and you do not use seamed lines. They'll split on the seam. Seamed lines can be double flared for an SAE connection however. No teflon tape or sealant on AN fittings either.
One isn't necessarily better than the other - you get the size you need.
It's commonly called a dash 8 line or dash 8 fitting, you don't have to say AN dash 8. And AN stands for Army/Navy as it was invented before the airforce existed. The development comes from the military where a dependable, solid connection is desired. Also, the flare is 37* vs SAE's 45* flare so the two are not compatible. You will also need a separate flaring tool for AN hardline. They are all single flare and you do not use seamed lines. They'll split on the seam. Seamed lines can be double flared for an SAE connection however. No teflon tape or sealant on AN fittings either.
One isn't necessarily better than the other - you get the size you need.
Posting Guru
Joined: Apr 2011
Posts: 1,636
Likes: 5
From: Orlando area
Just consider the stock size fuel line and match it or go up one size. Most fuel systems are 5/16 or 3/8" lines/hoses, so play it safe and use a -6.
If you have a high performace big-block engine, you could go to a -8 line but that's the biggest you would ever need. Of course it doesn't hurt go bigger, except for your wallet.
If you have a high performace big-block engine, you could go to a -8 line but that's the biggest you would ever need. Of course it doesn't hurt go bigger, except for your wallet.
Cargo Master
Joined: Apr 2003
Posts: 2,408
Likes: 5
From: Parkesburg PA
Oh, I forgot to mention but AN line is measured by the OD and flexible tube by the ID.
And I agree, a -6 line would be sufficient for almost all small blocks and most big blocks. There are race guys running 8's in the 1/4 (8-900hp) using -6 lines...
Fuel systems are one of the area's where the classic cliche "if some is good and more is better, way too much is just about right" comes to mind. Even I got caught up in it running -8 on my 450hp Chevelle... Waste of money.
And I agree, a -6 line would be sufficient for almost all small blocks and most big blocks. There are race guys running 8's in the 1/4 (8-900hp) using -6 lines...
Fuel systems are one of the area's where the classic cliche "if some is good and more is better, way too much is just about right" comes to mind. Even I got caught up in it running -8 on my 450hp Chevelle... Waste of money.
More Turbo
Joined: Oct 2009
Posts: 731
Likes: 6
From: Jonesborough, TN
Oh, I forgot to mention but AN line is measured by the OD and flexible tube by the ID.
And I agree, a -6 line would be sufficient for almost all small blocks and most big blocks. There are race guys running 8's in the 1/4 (8-900hp) using -6 lines...
Fuel systems are one of the area's where the classic cliche "if some is good and more is better, way too much is just about right" comes to mind. Even I got caught up in it running -8 on my 450hp Chevelle... Waste of money.
And I agree, a -6 line would be sufficient for almost all small blocks and most big blocks. There are race guys running 8's in the 1/4 (8-900hp) using -6 lines...
Fuel systems are one of the area's where the classic cliche "if some is good and more is better, way too much is just about right" comes to mind. Even I got caught up in it running -8 on my 450hp Chevelle... Waste of money.
Also, they make adapters to go from AN fittings to NPT fittings, etc. There are a ton of adapters out there.
Laughing Gas
Joined: Nov 2011
Posts: 1,033
Likes: 11
From: Wausau, WI
I'll bit on this one too. For my build, I'm running a -6 line for fuel. This will be hooked up to run a 460 and I'm confident I will never have a fuel starvation issue (even when the new engine is built).
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Senior User
Joined: Apr 2012
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From: South Texas
Thanks guys for all your help. I know now that for my 302 running a 600 cfm carb the -6 line should be plenty enough. now a lil different question, would 2 inline filters to the carb be too much?
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