Good morning!

[steveo]

Ultimately I built a hodge-podge setup in which I stuck a TPI intake on the Vortec heads using an aftermarket lower manifold and used a 96-97 LT1 PCM to control it all so I could use OBDII logging tools and ultimately integrate the 4L60E at a later time. That said, hindsight has told me that I either should have just used a OBDI PCM or gone with a 0411... would have been easier in the long run and had better documentation!

what are you using for cam positional reference? did you gut an opti?

[Maxzillian]

I managed to squeeze the opti trigger wheel and sensor into a TPI distributor. Ultimately I cut the center out of the opti-spark to yield the bearing carrier and sensor mount. I shaved the top of the TPI distributor flat as well as the bottom of the section cut from the Opti and bolted this assembly onto the platform. I then machined a steel bushing to neck the Opti hub (which was shaved down on a lathe) and press fit plus soldered it to the TPI shaft. Additionally I made a shield for the trigger wheel on the assumption that arcing in the cap could screw with the sensor. Finally I took some brass stock and made a wider tip for the TPI rotor to allow for a wider spark advance range.

Originally I had machined a hub to hold the shield and trigger wheel as an assembled and set-screwed that to the distributor shaft. The sensor was screwed straight to the base of the distributor. However, I had a lot of trouble with keeping the vertical lash in check and the top bushing of the TPI housing was wearing out. The Opti-spark bearing serves as a better means of keeping the shaft from moving around, reducing backlash and timing variance.

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The top of the sensor was cut to intersect with the distributor cap. I preferred this over cutting the cap as any future caps won't require modification.
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