AN Fittings/Engine/ Fuel system help. PLEASE HELP

[montessaj]

Hey guys,

I am in the process of building a 383 stroker for my Monte and I needed a little help with the fuel system. I am using one of the trickflow head setups part number TFS-K314-500-450 it is rated at 500hp with a victor jr. manifold and a 750cfm holley. I think I'm going to go with the victor jr. and a demon 750 or maybe a proform 750. I have an all forged shortblock with 10.1 cr pistons. I want to use AN fuel lines and fittings, but I have never installed them before. My questions are: How do I install the fittings on the lines? Do you use teflon tape when you are connecting fitting to fitting? Also should I use -8 or -6 line? I have a holley blue fuel pump and regulator it pushes 130gph at 14psi. Is this pump large enough to feed this motor? I would also like to shoot abou 100hp shot of zex nitrous at some point. ANY SUGGESTIONS WELCOME. Also, has anyone tried the trickflow setups and if so do that work as well as they say?.

 

[78MC-BBC]

well i have never known anybody using Trickflow heads on a Chevy, alot of the mustang guys use them. Personally i'm using Brodix BB-2 on my big block. The intake choice is fine and i'd stick with the holley carb, not a big fan of demon carbs heard and seen alot of crap in them when new. For the AN stuff, i'd go with -8an hose since you want to spray it. The hose is going to be expensive plus either -6 or -8 hose you have to modify your fuel tank to connect to the AN stuff. Personally i installed a stock sumped gas tank with AN lines going in/out of it. I am running -10AN from the sumped tank to the fuel filter near the tank then to the mechanical pump on block, then -8AN from the pump to the carb. Also your pump is fine for the motor, i would recommend you running a fuel pressure regulator with a -6AN return line & FP gauge, it would keep your pump running cooler and you would have to dial down the fuel pressure to 7psi, pretty sure 14psi would flood the carb or float the valves in it. On the braided stainless AN hose the an fitting and hose is not that complicated to assemble, and no you dont use teflon tape on any AN-AN fittings. the fittings are two piece, the Red part of the fitting gets pushed over the end of the hose and the blue part of the fitting gets threaded into the red fitting on the hose, make sure the hose does not push out of the fittings. You can also buy the push lock hose and itting which are cheaper and easier but not as fancy looking as braided stainless

 

[montessaj]

On the trickflow heads, I was reading again last night and Super Chevy did a test on one of the other setups that was supposed to make 445hp and it actually made about 506 on they dyno. It seemed ok but I'd like to get a little more insight on them if anyone has used them. Thanks for the advice on the carb. I think I will try the An fittings and braided hoses. Ill post some pics as soon as i get some to show you how its going. Anymore advice for my setup would be mucho appreciated.

 

[85 Cutlass Brougham]

The AN fittings should not require teflon tape. The way you install them is that you essentially build the hose. The fitting comes in 2 pieces, one that you put the hose onto that has internal threads and then you screw the other side into the bottom. Screwing the 2 pieces together traps the hose in the middle and the pressure seals the fitting. You will need to cut the hose with a hack saw. Before doing so, you will need to wrap the part of the hose you intend to cut with tape so that the wires do not fray and make it difficult to put it into the end that you screw the outside of the hose into. After you cut the hose, you remove the tape. The "easy" way to get the hose in would be to wrap the outside of the fitting with tape and gently put it in a vice, with little pressure. You don't want to crush the aluminum.

The only place you may wish to use Teflon tape is where you use a pipe thread to AN Adapter such as where it screws into a gas tank sump or carburetor. Everywhere else the fittings seal because of the 37.5 degree taper between the fittings.

As for the Holley Blue Pump, I have had bad luck with them but others have not. I burned up two of them, and the one that is on the car now is a mix and match of those two. It should do fine to feed your engine, but if it gets too hot it will not run enough pressure and starve the engine for fuel. I have had this happen several times on my AMC Spirit and it is the reason I bought a good mechanical pump to get rid of my electric pump. It's not fun to be at WOT and have the engine run dead lean on the drag strip! It would do this after my 25 mile commute there in traffic, and the pump is hung under the car by the back bumper, so it should be getting air. This could be due to the deadhead regulator that comes with it, or it could be my mounting location too. Just be fore warned that it can be an issue.

 

[megaladon6]

also you don't use teflon tape on gas or oil lines. it'll disolve.

 

[Monte SS 383]

They make the metric fuel line adapters that will connect to O-ring connectors on the fuel tank to connect the AN fittings to. They are made by Russel.