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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,624
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I'll reinforce what Thomas and Gordon said, plus some additional suggestions. I did a similar swap, a 1980 RoW CIS engine into a 1973.5T (CIS) car.
Yes, you need the 6 pin CDI box as discussed. I recommend that you keep the wiring from the distributor to the CDI box separate from the engine wiring harness. On the 1980 engine they are taped together and the black/purple wire goes through the 14-pin connector. If you keep them separate, then if you decide to go with a 123 distributor or some other ignition changes, you don't have to unwrap and pull apart the engine harness.
On my 1973.5 car, the original tachometer works with the black/purple tach signal from the SC CDI box connector. I don't know if the 1970 tach is different, but John Bell, "jbell959" on this forum, specializes in gauges and would know and have whatever you might need to adapt them.
Alternator: Did you use, or do you plan to install, an alternator with an internal voltage regulator? That will simplify your engine wiring harness by eliminating 1-2 wires and the VR on the panel.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
Last edited by PeteKz; 01-10-2024 at 10:58 PM..
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