Reply to "Holley carburettor adjustment needed"

It's not working yet but I'm making progress.

I measured the compression, everything is OK, between 12 and 12.5 bars on all cylinders. So no problem with valve clearance or sealing.

I installed my old carburetor, it runs a little better, I was able to lower the idle speed to 1100 rpm BUT there are still backfires.

I carefully observed the advance point with a brand new strobe lamp that I just bought, mine was 35 years old and starting to get tired, and I noticed instability and especially flashes corresponding to the spark other cylinders. The explanation for the backfire surely comes from there and moreover the wiring of the ignition box (Pertronix 510) is part of what has changed since the tests outside the car since it is now the definitive wiring.

So I have to look at the ignition side and to begin with could you confirm that my igniter (Chinese replica) is indeed a Magnetic Trigger type

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8/30/2311:18 AM

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