Holley/Demon Carb stumble

Makes you wonder why they went out of business lol.

Click to expand...

After being a dealer for a few years, it really wasn’t any surprise.

Here’s another quick one......
Guy who works the phones at one of my suppliers buys a BG Silver Claw when they first came out.
He updated the motor in his 69 Camaro from a pretty mild 350 to hotter 383.
The tweaked 1850 Holley from the 350 wasn’t cutting it, so he buys the Claw.

The thing will hardly run.
Very unresponsive to jet or air bleed changes.
I have him borrow a carb from a buddy of his with a hot little 406.
The 383 runs great with that carb, so we’ve ruled out everything with the car.

I have him send me the carb.
The air bleed channels in the main body are 90* holes that go from the air horn area to the metering block area.
Two holes drilled from each end, meet in the middle....... same as a Holley.
It seems they work better when they actually meet in the middle.
6 of the 8 air bleed holes didn’t connect the two sides.
The kicker is....... when we’d call to ***** about this stuff, they’d keep saying how its impossible they could be so far off...... cuz they’re all “wet flowed”.
Well...... they might have been wet flowed....... but apparently no one was looking at any gauges, or if they were..... they didn’t care what they said.

Anyway, after correcting that problem I tested it on a street/strip 396..... reworked the calibration..... got it running pretty good, and sent it back to the owner.
He said it worked good after he got it back.