General Category > Quadrajet Carb Talk and Tips

LOW budget engine not working well....HELP!

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jberenyi:
Just fired up a newly rebuilt 1974 350 Corvette engine and the idle is rough and slightly unstable.  Above 850+ RPM and driving the car its great.  But in drive at idle its a low rough idle and it wanders from 650 to 850 rpm.  The idle mixture screws are about 3 turns out.  There is no hesitation either its just an unstable rough idle.  BTW, the engine is bone stock.  What could the problem be?  Do I have to wait for the engine to break in due to a lower compression till the rings seat?

77cruiser:
Have you tried adjusting the mixture screws?

Kenth:
A 1974 350 Corvette engine should idle like a kitten.
What camshaft is used? Part-#?

Mudsport96:
Please elaborate on newly rebuilt.

Cam part number
Heads
Compression
Piston part number if available
Head gasket
Etc.

Could be in the boat i am. Not quite enough compression to get a solid idle but just enough to run fine everywhere else.

Cliff Ruggles:
I looked in my QuickBooks program and it looks like that job was done back in 2017.  No details on the engine build and I don't remember the job.  It's lost in the shuffle as I've done close to 15,000 of them since I started keeping records.  We'll just have to wait for details.......

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