Mark, I bypass the smoke test - and use about 5psi pressure - from the intake elbow.
Works well. Can't put too much pressure on the elbow - soft rubber - not made for pressure. But 5 psi is plenty to find any leaks - it will come (p)hissing out.
Just a piece of plastic plumbing fitting that can squeeze in to the elbow, with a cap on it and a threaded hose nipple.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
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