GM LT1 to AMC setup

[EagleMark]

Thank you for for clearing that up. Strange though they had OptiSpark distributor, which I know had some slight mechanical differences. I'm wondering if the sensor wheel was the same? It seems to be key in determining which cylinder is firing as all eight are differant, so I wondered what the cam sensor was needed for. From your info I'm guessing no cam sensor on 92-93 either?

[cmaje72]

Nope no cam sensor. 92-94 F-bodies had the non-vented opti. As near as I can figure mine came from a 94. I did modify my opti to vent it like the newer ones and the internals look to be the same as the later opti's. I have a spare b-body lt1 sitting on a stand in the garage and took it apart before I did the one in the truck just to get the hang of what needed to come apart. they are pretty similar excpet for the drive part on the back and the venting.

[EagleMark]

My research has shown just that. Early 1994 had the drive gear change but did not have the vent but was a dealer recall to do so. I have that paperwork with my car from dealer as it was upgraded to vented.

I also have one here taken apart, was told it can't be done! Ha! But then found the bearing is specail and no longer available. So buying a good aftermarket Opti with new bearing, using the stock sensor and wheel with new cap and rotor is still way cheaper than buying the entire unit new from GM. If I could have found a bearing it would have been a rebuildable part. Machining housing to new bearing would be more than buying one from like Chandler Motorsports who has 2 options, cheap one year warrenty, little more money for liftime warrenty. Lifetime warrenty has obvious better quality pickup sensor!