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The original Callaway A1 turbo kit, as sold by New Dimensions after they acquired all rights to the Callaway V-dub stuff.

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A drawing showing where the Callaway oil return is drilled through the back of the block.

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A pic of the actual hole in the block.

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An advertisement for a Callaway turbo kit, maybe from a ND catalog.

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The March, 1983 article from Car&Driver about the Callaway Turbo Scirocco.

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A picture of the bottom of a Callaway turbo motor in what I believe to be an A1 chassis (no subframe, A1-like relay shaft). The wastegate is in the lower right; note the beefy brace with the axle notch going over (under) the WG.