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Search: Posts Made By: lars
Showing results 1 to 25 of 489
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Forum: C3 Tech/Performance
04-17-2024, 11:43 PM
Replies: 7
Views: 198
Posted By lars

The OPs first photo shows a 1980 electric choke....

The OPs first photo shows a 1980 electric choke. That choke has been intentionally disconnected because it's inoperable. They then rotated the choke cover clockwise to lock the choke in the wide...
Forum: C3 Tech/Performance
04-15-2024, 10:14 PM
Replies: 7
Views: 340
Posted By lars

The two carbs were almost a full point off and...

The two carbs were almost a full point off and different on air/fuel. That makes a significant difference. You can easily jet the Q-Jet correctly to make it achieve 12.5:1. If we jetted the EDL...
Forum: C3 Tech/Performance
04-15-2024, 09:46 PM
Replies: 6
Views: 327
Posted By lars

The first visual difference between the two carbs...

The first visual difference between the two carbs is that the 1979 carb is set up with the provision for the float bowl EVAP canister nipple in the forward side of the bowl. The '77 carb does not...
Forum: C3 Tech/Performance
04-15-2024, 09:34 PM
Replies: 7
Views: 340
Posted By lars

I sure would have liked to see the test results...

I sure would have liked to see the test results of the Q-Jet running at the same air/fuel ratio as the EDL VRS. How can you compare the numbers when the one carb has been handicapped with the wrong...
Forum: C3 Tech/Performance
04-14-2024, 04:58 PM
Replies: 94
Views: 1,874
Posted By lars

That's because the distributor is not installed...

That's because the distributor is not installed correctly or clocked correctly. As 69427 correctly states, it's not a wire placement problem: You can install a distributor to make the #1 wire...
Forum: C3 Tech/Performance
04-14-2024, 10:56 AM
Replies: 94
Views: 1,874
Posted By lars

I have offered to send the OP the distributor...

I have offered to send the OP the distributor installation instructions, complete with photos, if he sends me an e-mail request (my post 18 above). I have not heard from him. I can also send him the...
Forum: C3 Tech/Performance
04-13-2024, 11:22 PM
Replies: 94
Views: 1,874
Posted By lars

Yup. Distributor is not installed correctly.

Yup. Distributor is not installed correctly.
Forum: C3 Tech/Performance
04-13-2024, 10:38 PM
Replies: 94
Views: 1,874
Posted By lars

Correct. And #1 is the forward, passenger side...

Correct. And #1 is the forward, passenger side plug wire. In your post above, you had this conversation::

MelWff:
Exactly which spark plug wire did you connect the timing light to?
You:
Number...
Forum: C3 Tech/Performance
04-13-2024, 09:46 PM
Replies: 94
Views: 1,874
Posted By lars

If you can't rotate the distributor to get any...

If you can't rotate the distributor to get any more than 2 degrees of timing, you are either timing off the wrong plug wire, or your distributor is not installed correctly. See my post above. If the...
Forum: C3 Tech/Performance
04-13-2024, 08:21 PM
Replies: 94
Views: 1,874
Posted By lars

The 1971 distributor, if correctly installed,...

The 1971 distributor, if correctly installed, does not have the #1 wire on the forward driver's side. That's the HEI location. The 1971 distributor has the #1 wire on the forward passenger side....
Forum: C3 General
04-12-2024, 11:20 PM
Replies: 16
Views: 577
Posted By lars

Carter made carbs for all product lines,...

Carter made carbs for all product lines, including Vette. Lots of Vette carbs built by Carter with the full Rochester part number on them. The float bowls will state that it's a Carter-built carb. GM...
Forum: C3 Tech/Performance
04-10-2024, 05:41 PM
Replies: 8
Views: 252
Posted By lars

That's what I used to think, too, but that's not...

That's what I used to think, too, but that's not correct. The reason that you would assume that the 1:2 change ratio is correct is because we know that dwell is measured in distributor degrees - not...
Forum: C3 General
04-10-2024, 12:00 AM
Replies: 5
Views: 216
Posted By lars

I retract my statement - I looked at that wrong....

I retract my statement - I looked at that wrong. The choke coil shown is obviously cold, and it has the rod retracted DOWN all the way to where the surface of the intake manifold would be. That's a...
Forum: C3 General
04-09-2024, 10:02 PM
Replies: 16
Views: 577
Posted By lars

'69 SR carbs were stamped with the original carb...

'69 SR carbs were stamped with the original carb number up through the late '70s. In the early/mid '70s, some of the SR carbs received a "0" in front of the original part number (07029207). Finally,...
Forum: C3 General
04-09-2024, 08:17 PM
Replies: 16
Views: 577
Posted By lars

You can often tell from the date code. SR carbs...

You can often tell from the date code. SR carbs also usually do not have the assembly plant ID code.

As a side note, the SR carbs are absolutely identical replacements for the original carb. All...
Forum: C3 General
04-07-2024, 10:35 AM
Replies: 5
Views: 216
Posted By lars

That's the one-year-only '68 Q-Jet Vette choke...

That's the one-year-only '68 Q-Jet Vette choke coil. It is opposite all other Q-Jet choke coils. It will only work with a real '68 Vette Q-Jet that has the choke coil rod forward of the choke lever...
Forum: C3 General
04-06-2024, 09:41 PM
Replies: 5
Views: 177
Posted By lars

If you're changing the cap, just break/crush the...

If you're changing the cap, just break/crush the seized cap towers and remove the wires from the remnants. ViceGrips will crush the towers just fine.
Forum: C3 Tech/Performance
04-02-2024, 11:40 PM
Replies: 10
Views: 280
Posted By lars

The shifter can be adjusted when it is attached...

The shifter can be adjusted when it is attached to the transmission, regardless of whether or not the tranny & shifter are installed in the vehicle. However, if your shifter is attached to the...
Forum: C3 General
04-02-2024, 12:54 PM
Replies: 4
Views: 222
Posted By lars

You can't assume that simply lining up the dots...

You can't assume that simply lining up the dots is going to get you at exact TDC. It will get the gears aligned correctly for assembly, but it's unlikely that you will get the crankshaft actually...
Forum: C3 Tech/Performance
03-31-2024, 08:20 PM
Replies: 13
Views: 421
Posted By lars

I have two of them here in the shop, and they are...

I have two of them here in the shop, and they are both correct. If you can't find a good Delphi, use Carter part number M6955. I've never seen one of those pumps with a 1/2" threaded outlet. They are...
Forum: C3 Tech/Performance
03-31-2024, 02:07 PM
Replies: 13
Views: 421
Posted By lars

The Delphi pump should not have a 1/2" thread. ...

The Delphi pump should not have a 1/2" thread. It is 5/8". If it's 1/2", it's wrong.
Forum: C3 General
03-31-2024, 10:55 AM
Replies: 6
Views: 239
Posted By lars

Popping out the top of the carb is not a timing...

Popping out the top of the carb is not a timing issue - it's a lean condition. Richen it up. But make sure your timing is set up right before you touch the carb - unless you have some really good...
Forum: C3 Tech/Performance
03-30-2024, 03:04 PM
Replies: 13
Views: 421
Posted By lars

That's the normal, standard length of an inverted...

That's the normal, standard length of an inverted flare fitting - you're not going to find anything, or need anything, longer than that. If that fitting, assuming it's the right size, does not seat...
Forum: C3 Tech/Performance
03-30-2024, 01:57 PM
Replies: 13
Views: 421
Posted By lars

Buy the correct hard line. Autozone does not sell...

Buy the correct hard line. Autozone does not sell Corvette fuel lines. If you want to fabricate your own line, buy the pre-flared 3/8" inverted flare brake line sections. They have the correct...
Forum: C3 Tech/Performance
03-30-2024, 01:33 PM
Replies: 13
Views: 421
Posted By lars

The outlet of the fuel pump is for 3/8" hard...

The outlet of the fuel pump is for 3/8" hard line. It is an inverted flare connection, and uses a straight-thread 5/8-18 thread size.

They should have sold you part number DFP MF0026. This is the...
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