A friend of mine offers an upgrade kit for the IDF 40 Weber carbs, allowing to increase the Venturi size from original 28 mm to 34 mm. Also, the spray bar is a completely different design with a more even spray pattern. I purchased this kit already 3 years ago, but never had the itch to mount it. But with the car now in pieces anyways, it was a good time to install the kit:
left side: og spraybar and 28mm venturi (2-pc design) right side: one piece 34 mm venturi with incoporated spray bar
and this is one of the finished carbies, with both new venturies assembled:
When everything will be assembled, I'll also add another heat barrier under the Webers, original VW "Pertinax" seals, of course with enlarged inner diameter to fit to the ported heads:
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