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304 Fitting a 4 BBL Manifold to a 304 (TP Dual Plane Injected)

EYY

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Thought I'd start a new thread on this so that the info/progress is all in one place.

The end goal is to have this TP dual plane running on a 304 in the HJ. But first the plan is to get it running and driving in another V8 Statesman I currently have here. This means when I put the 'new' engine in with new cam, rings and bearings I can be confident it'll start, run and drive so it can be properly run in. The tuning is what concerns me the most but not the end of the world if I stuff something up on an old engine.


The previous owner had snapped a bolt off in one of the injector rail mount bosses, then tried to removed it with an ezy out and snapped that in there too which is why i got it for a good price. Cut the top off the boss and drilled and retapped a new hole.


Purchased one of these from SSS/AT/Procomp. Not sure on quality but seems okay so far. Uses a ford 351 TPS and a GM IAC. Should do the job.


Polished one of the fuel rails and crossover today and started fitting sensors and fittings.


Throttlebody gasket and stud kit have been ordered too
 

wraith

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So take it your going EFI?

Just a note we got TP to drill out the boss at the back for Manifold Air Temp sensor. It's hidden in your photos but it's near the vaccumm line. We used the tapped back port for the brake booster by itself with a barb fitting. Tried going tee piece but it was just a pain.

Also managed to run factory PCV the way it was from stock. Left side viewing it straight on went into the bottom of the filter using the included Edelbrock filter barb (had to drill some holes but theres spots for it on most of them). Right side we had the hose run from the throttle body into the stock PCV valve then into the rocker cover.
 

EYY

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So take it your going EFI?

Just a note we got TP to drill out the boss at the back for Manifold Air Temp sensor. It's hidden in your photos but it's near the vaccumm line. We used the tapped back port for the brake booster by itself with a barb fitting. Tried going tee piece but it was just a pain.

Also managed to run factory PCV the way it was from stock. Left side viewing it straight on went into the bottom of the filter using the included Edelbrock filter barb (had to drill some holes but theres spots for it on most of them). Right side we had the hose run from the throttle body into the stock PCV valve then into the rocker cover.
Thanks mate - yep this ones been drilled out. Bloke before me had it on a VS. Plan to keep the PCV system too - will probably use AN fittings and lines for that eventually.

I need to buy some heater hose fittings for it too - any chance you'd remember the size of the ones that go into the top/front of the manifold?

Will post up details of the fuel pump with pics as it goes together too. Got a holley mighty might carb pump as a lift pump which will feed a 1L swirl pot and then from a Bosch 044 up to the rail through 3/8 aluminium hardline with factory FPR. Already have everything I need in that regard.
 

wraith

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Funnily enough I found a text file I left myself years ago with that info yesterday. Hopefully it's right.

Brake booster was 1/4 inch NPT

Coolant was 1/2 inch BSP from memory.



I also got a TPS and MAT sensor loom extension from GM Motorsports so I didn't have to cut into any factory loom wires.
 
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wraith

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Well there you go. Didn't have that when I did the swap I don't think
 

immortality

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What radiator hose did you use?

I Unwrapped my loom and pulled the TPS and IAC wiring and re-wrapped.
 

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EYY

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Cheers gents, that’s a big help. Tried to remove the alloy fitting in the water port on top (black fitting) but it just kept turning. Got it out and threads in the manifold are damaged but should be okay with some sealant. No wonder the po left it there lol. Don’t think the same happens with brass fittings though?

As for the radiator hose, I’ll be trying a wb 253 hose as the thermostat housing is in a similar position and angle to mine, and the wb uses a Commodore style radiator. Will sit the manifold on the engine in the vs and see how it fits. Wraith has a different thermostat housing to mine. Mines angled upwards and has the heater hose outlet.
 

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I’m running a torque power dual plane, but it’s a high rise. So slightly different. But I’m using a Elite billet thermostat housing. Which has a single heater line off the back, the part of the housing for the radiator sit a lot flatter than a lot of the other ones I have seen. Ended up using a VY V6 top Radiator hose. But cut it in the middle and put a black alloy joiner

Was planning to use a HT 308 thermostat housing and top hose but the housing was just fouling on the manifold. And I think the hose wasn’t quite the right angle, and kept trying to kink.
 

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I had a similar problem, I'm using a Harrop DP manifold and had originally intended to use the VB-VK style thermostat housing but with the upward angle it would foul on the fuel rail cross-over. I ended up changing fuel rails and also changed to a 304 style thermostat housing which has only a very slight up angle.

Mine started as a simple manifold swap but it's totally blown out now. Hopefully I'll have it running this summer...:(

At some stage I do have a large single plane manifold to play with but that is a whole different kettle of fish:D
 
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delcowizzid

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No need to worry about signal to carburetor single plane on lol or cut the devider out and give it some plenum
 

EYY

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The WB hose fits fine with about 25mm cut off at the thermostat end. Does touch the fuel rail but can't see that being an issue. A different thermostat housing would be ideal but at $100+ I'll just stick with what I already have I think




 

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as i said, mine is a high rise dual plane, no show car but, gives you an idea of my setup



 
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exec24

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thanks, it's a tidy streetcar. wiring is still pretty much in factory locations

it did take alot of time getting the radiator, heater hoses, fuel and vacuum hoses and fitting sitting where i wanted them to. many different fittings and hoses were purchased

as well as the emission lines for the charcoal canister which ive fitted underneath the factory battery location
 

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Hi All,

Bit of a grave dig here. I had a 304 in my hilux 4wd single cab which I have no ripped out and now am in the process of a new build with a dual cab. While the engine is out I will be doing a few things to it. Some flat tops, cam and manifold and maybe a few other things. This thread has been great for the manifold info and has answered a few questions.

One I still have it how do you run these style manifold with a standard or ls1 throttle body through to an airbox? Being in a 4wd I don't want an exposed air filter and will also be running a snorkel. Is there a style of throttle body I can buy to allow this is would I have to custom design it? Or do I need to be looking at a different kind of manifold all together?

Cheers!
 

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Hey , edlebrock ( a few others I think do as well) a 90 degree intake fitting.
You can run a throttlebody like here and then the 90 degree fitting or bolt up the 90 degree fitting and mount a ls/ standard 5.0 ltr style throttlebody then to your airbox .
Are you going 355 with the rebuild?
Should = for the small amount extra cost ,sooo much more low down torque = just what you need in a 4x
 

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Thanks for that mate. I'll check them out.

My block only has 10 000kms on it so throwing some pistons and cam in will cost me a fair bit less than going stroker. But now you've brought it up I'm going to start doing some research and see where it takes me haha
 
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