3.1 to carb

[STEVE1103]

Removig the EFI from a 3.1, have the carb and manifold from a 2.8. had run the EFI fuel line with an external electric fuel pump, can I now use these lines for the carb with some king of pressure reducer? Engine is in a 47 Chevy. Have the EFI and complete wiring harness for the 3.1 91 Camaro, and I don't need it!

[gsEnterpries]

The 3.1l's have diiferent intake port positions than the old carb iron heads. So if you want to use a carb you have to use 2.8l iron head heads to use a carb or custom make a manifold. I asked the same question a couple of days ago. See thread "Head swap, please help" under Pushrod Performance to see what I mean

-Gary

[923.4v6]

All RWD iron head 2.8 3.1 and 3.4 heads are interchangable. The older 2.8's pre 85 had smaller valves. The alumium heads uses a different intake. The efi fuel lines will work you can use a fuel pressure regulator to decrease the pressure from the electric fuel pump. But advance or auto zone sells a inline electric fuel pump which may be cheaper than buying a regulator and it wont have to have the regulator.

[gsEnterpries]

That I did not know, very sorry

-Gary

[STEVE1103]

Heads

Someone had told me about the rear wheel drive 3.1's and 2.8's had the same heads, thanks for the fuel pressure advice.

[1meanz]

i beleave they are exactly the same

[STEVE1103]

47 Chevy

Trying to send a picture, might be to large.

[geoffinbc]

If you do not have a return line you cannot use the stock pump. If you do have a return line just get a return style regulator for carb applications and set your pressure and your good to go. You can never run a pump without a regulator, weather it be integrated into the pump or external.

[no_doz]

yup-cant have those pulses messing everything up.

[geoffinbc]

yup-cant have those pulses messing everything up.

What "pulses" are you talking about?