Messages

61

Maintenance / Re: At a loss - engine stalls under load

« on: July 11, 2022, 09:33:27 AM »

Carb is essentially the same, just a newer version

62

Maintenance / Re: At a loss - engine stalls under load

« on: July 10, 2022, 06:53:07 PM »

Update....borrowed a carb from my brother and swapped it onto the car.  Good news......stall condition under load is gone.  Bad news, I have almost no vacuum (5 inches) and the engine has a slight miss in it.  I adjusted the idle mixture to try to bring the vacuum up with no luck. 
One of the other things I noticed is that the new carb puts my car in fast idle when cold, my old carb never did that.  Could that be an indicator of the cause of my past problem?
Going to go back through my wires and plugs, adjust timing, etc. to see if I can find the source of the miss. Feel like I'm headed in the right direction, just not there yet.
Thanks again for all the ideas!
Jim

63

Maintenance / Re: At a loss - engine stalls under load

« on: July 07, 2022, 12:15:15 AM »

Car runs cool.....roughly 180 degrees.  I'll pull the plugs and take a look, might just change them to eliminate that potential cause though I would think if I had a plug issue, it would run rough all the time.

64

Maintenance / Re: At a loss - engine stalls under load

« on: July 06, 2022, 09:46:52 AM »

Thanks for all the input guys.  The engine pulls 14.5" of vacuum t 900 rpm idle.  I'll try to crack the gas cap on the tank to eliminate that potential cause.  Per suggestion, I'll pull the carb again and check my PV installation.  Will also make sure everything else on the carb looks ok.
Is there any possibility that I have an intermittent short in the electrical circuit between the ignition and the coil?  I dunno....if it was that, it would not just do it under harder access correct?  Totally grasping at straws these days.

65

Maintenance / Re: At a loss - engine stalls under load

« on: July 05, 2022, 11:32:56 PM »

Car will rev in neutral without issue. 

I had a problem like this on a quadrajet car, turnout to be missing that darn thin metal separator gasket.

Check the vacuum values?

Might NOT apply to your Holley situ

I'm not familiar with the thin metal separator gasket.  Where is it on a quadrate? Vacuum is right at 14.5 inches

66

Maintenance / Re: At a loss - engine stalls under load

« on: July 05, 2022, 11:31:09 PM »

Did the problem occur out of the blue?

I have been trying to recall the sequence of events.  I believe this condition started after I installed new 8.5 power valves in the carb.  I did check them before installing.

67

Maintenance / Re: At a loss - engine stalls under load

« on: July 05, 2022, 01:30:03 AM »

4346 GM Holley - all original parts, Erik Jackson went through it before I installed it.

68

Maintenance / Re: At a loss - engine stalls under load

« on: July 04, 2022, 11:36:53 PM »

Checked the access pump per Steve's suggestion....carb received a shot of fuel as soon as I moved the throttle lever.
Fuel tank is new as are the lines all the way to the carb.  I did retain the original sending unit just because it was original to the car.  It was in perfect shape and the filter sock was still pliable and not deteriorating.

69

Maintenance / Re: At a loss - engine stalls under load

« on: July 04, 2022, 08:09:40 PM »

Float level is good in both bowls. 
How do you tell if accel pump is functioning correctly?

70

Maintenance / At a loss - engine stalls under load

« on: July 04, 2022, 05:57:29 PM »

Looking for some insight on troubleshooting my engine troubles.  Car starts, idles, drives out fine until you give it any heavy throttle.  I'm not talking mash to the floor, just hard acceleration, say 1/2 to 3/4 throttle.  When you do that, engine stumbles, then dies.  Quickly restarts and runs fine at light/partial throttle.  Car will rev in neutral without issue.  Car also seems to be able to handle heavier throttle when I first take it out.  After about 1 mile of running through the gears a few times, it can't handle heavy throttle.  I started to troubleshoot, then fell into the black hole of replacing parts one at a time to no avail.  Here's what I've done/checked:
1) checked plugs - fine
2) check resistance on plug wires - fine
3) checked coil - fine
4) replaced points with electronic module / along with coil
5) checked timing - fine
6) plugged vacuum advance - no change other than difficult idling
7) changed plug wires
changed fuel pump

What am I missing?  BTW, it's a solid lifter 427 built to stock specs - heads, cam, carb, distributor are all OE stuff.

71

Decoding/Numbers / Re: 1968 copo?

« on: June 12, 2022, 09:13:42 AM »

I'm in learning mode on this also....were the 140mph speedo and heavier sway bar regular options for a different model?  Or were these components specially made for Don Yenko?

72

Decoding/Numbers / Re: Factory Axle Stamp?

« on: April 07, 2022, 01:11:06 AM »

Same date as my BE rear.  That grinding looks like someone tried to clean off rust to read the stamp vs anything the factory might have done.  If the factory did it, it would be very intentional to eliminate worn numbers IMO

73

Originality / Re: 1969 L78 Fuel line brass block with hold down bracket attached

« on: March 31, 2022, 10:43:45 PM »

I'm not sure why the supplier or GM would apply paint to a brass block.  Extra cost for what purpose?  The pic on the post above doesn't look like it's been painted.  I assume the Legends guys have unrestored examples that show the silver paint finish?

74

Originality / Re: Gas tank and heater box markings

« on: January 27, 2022, 11:57:12 PM »

When you guys refer to the number written on the "top of he front valance", for my clarity are you referring to the radiator side of the lower valance under the front bumper?

75

Original Cars and Details / Re: 68 L78 Rallye Green

« on: November 30, 2021, 11:24:31 PM »

This car "speaks to me".