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308, Trying to find a rattle

Hi All,

I got my 308 rebuilt, about 2 years ago. Has a Quadrajet, Bosch HEI, edelbrock performer, crane 276, 30 thou flat tops L34 heads always running 98 octane.

It would have all of about 500kms at this point. Starts and runs well. Issue i have is when cruising in 4th (Aussie 4 speed) If i lower the revs then accelerate theres a funny sort of flapping/rattle noise. It dosent sound nasty but it is annoying. I have found that if i accelerate and pull the choke slightly in (manual choke) it stops, but the engine bogs down.

I thought it might be the choke flap, but i have fastened this solid open at one point and had no success.
Running 34 total timing and about 14 deg initial. Vac gauge reading is 15 HG.

Note I did rebuild the carb myself.

Are there any ideas as to what it might be?
Thanks in advance.

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Comments

could it be engine knock or "pinging"..? pulling the choke is richening the mixture...running too lean can cause pinging...too much ignition advance and not high enough octane fuel are causes to mention some...btw it's bad for the engine if that's what it is...

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Andrew

THanks for the tip Andrew

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