Starved For Fuel?

[Thomas]

[ QUOTE ]
Thomas,
I would bet fuel starvation. The backfirk through the carb is a usual sign of that. I'm assuming 3/8 fuel line. I know in my 55 Chev,with the 5/16 line, that is the problem I had.
Also, what kind of ignition and what kind of gap on the plugs?
Peter

[/ QUOTE ]

Peter,
Everything is stock specs except for the exhaust.
The plugs are AC, the points and coil are Canadian Tire (our Canadian members will know who they are) house items (Wells?) I believe.

I think it may be time to check the float settings and then go for another drive an do some more "troublshooting".

[StriperSS]

I remember years ago when I first put a Holley carb on one of my cars. At the dragstrip it pulled like a bear in first gear and then fell flat on it's face when it hit second, like it ran out of gas. It actually did run out of gas, but it was due to the carb itself. I think it was float levels. I haven't fooled with a Holley carb for years, but that's where I would start.

[mfchassisworks]

Some cars respond better or worse than others with the lack of fuel depending on the size of the shooters, accelerator pumps, overall gear of the car and the engine combination itself.

First you must rule out the fuel pump and its capabilities.

If you dont want to run a fuel pressure gauge make a temporary T-fitting install it as close to the carb as you can, get Autometer's copper oil pressure line, and get a small liquid filled gauage and install in on the end of the line. Run it up the cowl to the base of the windshield, under a wiper arm, or 200 mph tape it to the windshield where you can see it. Find a safe place to run through the gears, Then watch how low your fuel psi gets. You will be surprised. If you don't have always have 7psi then you aren't making hp. If you try to tune based off you plugs at the end of a run they will give you a false reading as the carb will seem lean but really there simply isn't enough fuel. No fuel means low hp = low mph.

During the test when the car stumbles or... and you let off note the fuel PSI upon recovery.