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But which TDC? You have 2 . TDC firing - this is where your leakdown should be tested. All valves should be closed. And TDC timing. Here your I valve is cracked open to your timing setting, and the E valve is probably not quite closed (overlap). Both valves open here and the I valve stays open for a good distance of travel (120 deg?)(while the E valve is closed.)
You have to determine which TDC you are on when testing leakdown. Take the top valve covers off. This will tell you which TDC you are on. And tell you if you have jumped a tooth.
You could also pull the dizzy cap and look for the #1 firing mark as you hit Z1. That will tell you when #1 cyl is ready for leakdown test. The I valve rocker should be slack.
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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