Procedure to Replace Q-Jet on 72 350/200 w/AT

[Scott K.]

Working on bringing some of the parts and numbers on my 1972 into closer alignment with the findings from a recent flight judging. One of the things we identified is that the carb on the car was not the technical correct one so I located and purchased the correct one.

Interested in advice, tips and information on the correct process to swap this out. Sure.. I could pay the local shop to do it... but with the wealth of knowledge here and a little hands-on, perhaps I'm underestimating what appears to be a straightforward swap. That said, I'd like to give it a shot.

The engine is a 1972 350/200hp (non LT-1). Car has automatic trans and air.
Carb that's on there now is a 17054931. One I purchased is a 7042202 A2 DJ.
Carb has been fully rebuilt, tested and tuned to exact factory specifications by the shop I purchased it from.

Here's the new Carb:






Here's what's there right now...






In looking at my current set-up, would the process be to:

1. Remove linkage / connections from LH side
2. Carefully disconnect fuel line and vacuum connections from FRONT.
3. Disconnect connections and vacuum connections from RH side.
4. Disconnect brake booster connection from REAR.
5. Unbolt carb from manifold
6. Remove center stud
7. Remove Carb
8. Remove old gasket
9. Place new (gray colored) gasket
10. Set carb and lightly apply nuts
11. Attach gas line FRONT
12. Attach power brake line REAR
13. Use X pattern to tighten bolts slightly above hand-tight.
14. Connect vacuum hoses.

Is this pretty much it?

Questions:

- Any other material or sealant used between gasket & carb?
- Should I be changing the studs and nuts at this time too?
- How much gas is going to come of that fuel line?
(just have a rag handy?)
- Do I need to use any teflon tape on the brake fitting to carb?

Once I get the basic swap done, then we'll go for setting up the Idle Stop (which was missing on current vehicle and then the TSC on the RH side. I've bought ALL the right original parts.. but first things first.). Also, I have the evap hose an T for the PCV on order.. I know that is not correct as is. Right now, focusing on the carb swap.



Looking forward to hearing the group input on this.

[Edward J.]

Re: Procedure to Replace Q-Jet on 72 350/200 w/AT

Scott, It looks like you have it covered, don't use any sealer on base gasket or teflon tape,as the factory did not use.

There were a few things I noted with your 72 vacuum hoses, the driver side the PCV valve and the small w/stripped hose was taped together with friction tape. you have it routed behind the vertical shield it goes in front. the hose that is plugged is the for the TEC solenoid.

[Kurt G.]

Re: Procedure to Replace Q-Jet on 72 350/200 w/AT

Looks like you pretty much have it. As for the gas, there won't be much, but have a couple of shop towels or paper towels ready to clean up the mess. It's really a pretty easy project. No sealants or silicone needed. If you've not done it before take some masking tape and wrap it around the hoses, then mark them with numbers. Print your pictures and put corresponding numbers on the photos as a guide to where you took them off. Take it easy, don't force anything and you have it made. As for the teflon tape, I use it just as a precaution for leaks an make sure it's not visible once I get the fitting tight in the inlet. It's not needed, but what can it hurt. Right?

[Scott K.]

Re: Procedure to Replace Q-Jet on 72 350/200 w/AT

Noted.
Thank you.

[Scott K.]

Re: Procedure to Replace Q-Jet on 72 350/200 w/AT

Agreed.
Thank you for the input.

[Peter G.]

Re: Procedure to Replace Q-Jet on 72 350/200 w/AT

Scott..the carb looks great! It does look like you have everything covered for the installation.

The first thing that came to my mind when reading this I thought nesscessary to pass along to you.

If working in a enclosed garage during Winter months be extremely careful in regards to FIRE or the possiblity whenever working on fuel tanks, fuel pumps or even carbs. Watch space heaters, smoking etc. and have a fire extinquisher nearby.

Our Chapter President had a garage fire while working on his '71 vert and with the garage door open and high winds during the Springtime the garage fire quickly engulfed the whole house and burnt to the ground! House and Corvette were a complete lost, they rebuilt the house on the same lot, but he still misses the '71 Corvette that he had bought new.

Fortunetly no one was hurt or injured.

He was working on a electric fuel pump.

Be safe!

[Scott K.]

Re: Procedure to Replace Q-Jet on 72 350/200 w/AT

Scott..the carb looks great! It does look like you have everything covered for the installation.

The first thing that came to my mind when reading this I thought nesscessary to pass along to you.

If working in a enclosed garage during Winter months be extremely careful in regards to FIRE or the possiblity whenever working on fuel tanks, fuel pumps or even carbs. Watch space heaters, smoking etc. and have a fire extinquisher nearby.

Our Chapter President had a garage fire while working on his '71 vert and with the garage door open and high winds during the Springtime the garage fire quickly engulfed the whole house and burnt to the ground! House and Corvette were a complete lost, they rebuilt the house on the same lot, but he still misses the '71 Corvette that he had bought new.

Fortunetly no one was hurt or injured.

He was working on a electric fuel pump.

Be safe!

NOTED.
Excellent points.
No Space Heater while working on the engine.

[Patrick H.]

Re: Procedure to Replace Q-Jet on 72 350/200 w/AT

Use a big wrench on the nut on the carb while using a flare wrench on the fuel line.

Connect fuel line at least partially before dropping the carb onto the manifold and trying to tighten the hold down bolts; i.e. swap your step 10 and 11. You can't attach the fuel line once you bolt it down. Trust me on this one.

I still think the carb date is too early.

This is not a tough job. Just be methodical about removing all the attaching parts and then reversing it to install the new one.

Patrick

[Scott K.]

Re: Procedure to Replace Q-Jet on 72 350/200 w/AT

Use a big wrench on the nut on the carb while using a flare wrench on the fuel line.

Connect fuel line at least partially before dropping the carb onto the manifold and trying to tighten the hold down bolts; i.e. swap your step 10 and 11. You can't attach the fuel line once you bolt it down. Trust me on this one.

I still think the carb date is too early.

This is not a tough job. Just be methodical about removing all the attaching parts and then reversing it to install the new one.

Patrick

Solid advice.
Thx