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Username Post: 454 Troubleshooting
Posts: 3

Reg: 07-29-21
07-29-21 07:44 AM - Post#2824101    

Hi all, new here.

I have a 74-75 model 454 cast block and heads with aluminum intake on an airboat. Carb is 750 CFM Quadrajet that is only a couple of months old. Just installed the following: New plugs, new plug wires, new distirbutor.

I've had problems with the motor at 3-4k rpm. Motor will start fine and idle fine. I can rev throttle fine 1-2k rpm. If I floor it the motor will fall on its face until I let off the throttle, If i keep pressure on throttle motor dies completely. Running a mechanical pump 6psi 80gph. Motor is stock from what I've been told except bored over some. I've been scratching my head for a while with this.

I'm no mechanic but I can turn a wrench. Had timing set with older distributor by mechanic. Just installed new distributor yesterday. Still falling on its face at 3500 rpm.

When I revved up until it died yesterday I pulled a plug and it was wet, so it seems to be getting fuel. I just dont know what else to do.

Ground? Valve springs?

Any help would be much appreciated!

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