Corvette questions

**big gear head** · #1 12-23-2018, 10:42 PM

I've been working on my uncle's '69 390 hp 427 4 speed Corvette for a few weeks now and it's almost finished. One of the problems that he has been having for many years is the tach cable. Seems that it keeps breaking because of the angle of the cable coming out of the distributor. It's pointed almost directly at the firewall. He installed a 90 degree gear box on it which moved it too far and it's still breaking. I was wondering what the orientation of the distributor is supposed to be. Seems to me like it's not installed in the correct position.

Also, should this car have the 7029201 Q Jet carburetor or should it have something else? It has a 7040202 on it right now and I know that is not correct.

69z28302 · #2 12-23-2018, 10:57 PM

It might help if you remove the distributor and position it (the tach drive) more towards the driver side firewall

**big gear head** · #3 12-23-2018, 11:00 PM

I was going to do that, but I think that will put the vacuum canister against the spark plug wire bracket. I need to take another look at it, but I think that is why I didn't do that already.

**Rumbleguts396** · #4 12-23-2018, 11:38 PM

As far as the correct Carb you need. Is your corvette a 4 speed? does it have factory A.C.? if it is an AC car you will need the Rochester with the fast idle connection. This info is needed to help with the correct carb. ROB

Lee Stewart · #5 12-24-2018, 12:14 AM

Just posting this photo so that someone in the know can describe the position of the distributor. Engine is an L88.

**TWB** · #6 12-24-2018, 01:17 AM

A Corvette with a Tach drive distributor must have the distributor properly positioned to achieve the proper timing AND proper placement of Tach cable coupling. Many distributors will not be able to achieve both and the most common reason is the distributor gear placement. Gear has a small indented circle. That indentation must line up with rotor. Gear will install either way. This is not a problem in other than Corvette installations. It is a tight fit between intake runner and shielding bracket and vac advance will prevent proper setting when gear is 180 degrees out. If it has been apart and not reassembled this way you will have a problem like you describe. The assembly manual shows a patron the proper angle. I am guessing this is your problem. Do most of you other guys know this?

**PeteLeathersac** · #7 12-24-2018, 01:28 AM

'

Or if correct unit, could wire placement be off @ cap and moving them all one would allow dizzy to rotate into correct operating position w/o need for the adaptor?

~ Pete

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**big gear head** · #8 12-24-2018, 02:52 AM

I'll have another look at it tomorrow and see if I can move the wires 1 position and move the distributor. There is a lot of stuff around this thing that makes it hard to do anything with it. Thanks for the replies, I'll see what I can do with it.

No AC on this one.

Did the L88 not have the shields around the distributor?

**Tracker1** · #9 12-24-2018, 02:57 AM

7029215 Q-jet

**big gear head** · #10 12-24-2018, 03:10 AM

Thanks. Wow, people want a lot of money for that one!