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chipawah

card to fuel injection

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if i buy a 350 crate motor with a carb on it could i just put my manifold from my 305 on it and keep fuel injection or would i have to change my whole fuel system?what would i have to do to change my fuel system

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you need a diferent tank, i think fuel pump, and prob some sort of computer.... id rather have a carb for simplicity

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So Right now you have Fuel Injection right?

If so the throttle body should bolt right on to the 350 create. and hook up the o2 sensor and stuff. it should work. However the Stock throttle body is very restrictive so almost no power increase notice.

To do it right

http://store.summitracing.com/partdetail.a...mp;autoview=sku

cost $2300 But it gives you the computers harness and fuel pumps i believe. and will push your 350 in the high 300 hp range even low 400 hp if tuned right. Bolts right on to the 350

http://www.twoguysgarage.com/forum/forumdisplay.php?f=17

I would go ask this forum there very good with the Chevy small block questions

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The stock intake on your 305 and a 350 crate engine from the same era of engines (87-up) will bolt right on. All you have to do is remove the 305 from under the intake and exhaust manifolds, and bolt the 350 right up to it. Remember, they're the same engine essentially.

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The bolt-on is easy, making it work is the hard part. That's why I'm going to buy a fuel injected crate motor for my project.

I will still have to upgrade the fuel lines, modify the tank, and add an electric pump.

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Electric pump is the easy part. You can pick up one up that'll produce the 60 or so psi needed to run a fuel infection system for about 130-150 (hell of a lot cheaper than the in-tank sending unit and pump on most vehicles today).

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In tank units scare me a bit even though they are quieter. I'll still have to have my tank baffled to prevent fuel starvation from sloshing when the tank is low. I'll also have to upsize the lines.

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Yeah, but still that isn't that hard to do. Baffling a tank is actually easier than it sounds (although it is a little time consuming), and upsizing the lines won't be too hard either since you're going to have to replumb the entire thing anyway.

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All true, and I'm looking forward to the project. :AH-HA_wink:

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chipawah - If you're putting the 350 in the same car that currently has the 305 with the TBI, you already have everything you need in the car - the baffled tank, the pump, the lines are already there. Cappy is right about the throttle body. You at least probably need to get stock 350 unit, if not an aftermarket one. I think the 305 and 350 use different units but am not sure. You might also need to change the PROM in the engine computer.

Camino - a GM tank unit should go right in your tank without modifications at all. I think the FI unit and the carb unit use the same size hole. They did in my Blazer, which at the time only came in carbureted form. It's just that they're a PITA to service because you need to drop the tank. I also think an in-tank unit might yield a bit more power. My father put TBI in his '83 Silverado years ago, and he started with a Holley unit that mounted externally. Once he got right tanks/pumps/etc, he switched to in-tank pumps and the truck felt a little quicker.

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chipawah - If you're putting the 350 in the same car that currently has the 305 with the TBI, you already have everything you need in the car - the baffled tank, the pump, the lines are already there. Cappy is right about the throttle body. You at least probably need to get stock 350 unit, if not an aftermarket one. I think the 305 and 350 use different units but am not sure. You might also need to change the PROM in the engine computer.

Camino - a GM tank unit should go right in your tank without modifications at all. I think the FI unit and the carb unit use the same size hole. They did in my Blazer, which at the time only came in carbureted form. It's just that they're a PITA to service because you need to drop the tank. I also think an in-tank unit might yield a bit more power. My father put TBI in his '83 Silverado years ago, and he started with a Holley unit that mounted externally. Once he got right tanks/pumps/etc, he switched to in-tank pumps and the truck felt a little quicker.

i dont have tbi i have efi and if i just buy a crate motor with out a intake manifold can i just bolt my manifold right up to it where would i put my injectors or would i just bolt the right on at the same time?

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You've still got all the correct fuel plumbing, so that's a non-issue. I would think that the EFI manifold would bolt right up to the 350 without issue. You'll still have to get the computer to think that what you have in there is a 350 and not a 305. A PROM change is probably in order, and maybe the fuel injectors. I would go to an auto parts store (autozone.com) and look up replacement injectors for your 305, then a 350 with the same EFI unit, and see if they are the same part number.

This sounds like a cool project, whatever it is, and I'd love to hear more details.

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I'll check out all the options when the time gets closer. There are so many different pumps that might do the trick it may take a while to choose.

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You wouldn't really have to change anything. The intake will bolt right up, the injectors fit into the intake. The only thing that would hinder you is that if you DON'T reprogram the computer, then you'll end up with about the same power as the 305 that you originally had. The difference is in the PCM programming between the two engines. Otherwise, everything will be exactly the same.

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