Please check my upgrade list - Impala Tech
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post #1 of 9 (permalink) Old 07-13-2009, 11:12 AM Thread Starter
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Please check my upgrade list

After receiving all the valuable information here on the forum, I have decided to drop my plans for EFI (due to cost) and go with Q-Jet carb. So I have compiled list of upgrades, I want to do to my 1970 wagon with 350 SBC. Could somebody go thru the list and let me know what other accessories do I need (like fuel lines, etc) so I can take the whole setup to my mechanic and get the work done without any delays due to missing parts?

1. Edelbrock Performer intake kit (link) - This is a kit with all the gaskets and bolts.

2. Remanufactured Q-Jet 750cfm carb (link) - Pretty much the cheapest I could find as I was quoted $495 at the local shop.

3. Summit blueprinted HEI distributor (link) - This will upgrade my points distributor and get ride of the external coil.

4. Accel SuperStock 4000 Series spark plug wires (link) - I do need new wires if I upgrade to HEI.

5. Summit performance headers (link) - I know Hedman or Hooker is better but twice the money.

6. GM Performance Parts Proform Alternator (link) - Not sure if I need new one, so this is an option.

7. Throttle cable - Not sure if I need just the throttle cable (link) or throttle and kickdown cable (link)

I wasn't able to find gas lines for Q-Jet carbs on Summit's website and I think I need them as I am upgrading from 2bbl Rochester carb. Do I need to worry about the camshaft and other internals when upgrading the stock 350 from 450cfm to 750cfm carb?

Thanks.
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post #2 of 9 (permalink) Old 07-13-2009, 06:22 PM
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Keep in mind the 435 cfm rating for the 2GC carb is measured at 3 pounds of vacuum, It is only 308 cfm when measured at the 1.5 pounds that four barrels are measured at. (just for comparson purposes). You will need a new fuel line but some 3/8th inch ID copper tubing will work (we don't use copper tubing in automitve work because it work hardens), but since the fuel line only goes from the fuel pump to the carb it will not be vibrating or bending that much as it is attached solely to the motor.

As to the throttle cable and brackets the stock parts off any used car should work (they used Q-jets up until 1985).

Big Dave
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post #3 of 9 (permalink) Old 07-13-2009, 09:53 PM
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Is there any reason that good ol' 3/8" rubber fuel line and a couple of screw clamps couldn't be used?

What does a Q-jet have as the fuel line connection?

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
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post #4 of 9 (permalink) Old 07-14-2009, 05:43 AM
 
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The Qjet has a female threaded insert which houses a fuel filter. You could delete this by removing it and installing a fitting with a hose barb on one end and running the rubber fuel line to an inline fuel filter then to the pump. I didn't run a filter after the pump on my 87' Iroc build, just one by the tank and another one before the pump then a straight line from the pump to the carb.
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post #5 of 9 (permalink) Old 07-15-2009, 10:09 AM Thread Starter
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Would I benefit in installing Holley fuel pressure regulator (non-return type)? I do not think I have one now. I am definitely going to install in-line clear fuel filter and fuel pressure gauge when I do the carb swap.

Summit sells braided rubber fuel lines. They would look cool and probably easier to work with than copper ones.
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post #6 of 9 (permalink) Old 07-15-2009, 01:02 PM
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Not unless you are running an electric pump that has more than seven psi at the pump outlet. All mechanical pumps are pressurized by a spring inside the pump housing that regulates the pressure.

Big Dave
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post #7 of 9 (permalink) Old 07-15-2009, 02:58 PM Thread Starter
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Thanks Dave.

I have another question. I am thinking of replacing my stock air cleaner case (snorkel type) with 360deg open one. I can get ride of the aluminum hose from exhaust manifold to the butterfly valve in snorkel if I get carb with electric choke. What about the PCV and crankcase filter that's currently built-into the side of the air cleaner housing and going to one of the valve covers?
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post #8 of 9 (permalink) Old 07-15-2009, 05:33 PM
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when you get rid of the old air cleaner, and you've got the new carb on, you'll run a short rubber hose from the valve cover to a 'plenum' port on your intake/carb. The baseplate area of the carb is the same vacuum source as a fitting on the manifold. You can run either.

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
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post #9 of 9 (permalink) Old 07-15-2009, 11:56 PM
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You will need a push in paper filter element to go where the old rubber hose was to filter sand and small animals out of the incoming air to your crankcase.

Look at the rear of the valve cover. The round filter is what you want.



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