Inliners International Forums General Discussion Engines Which Knock Sensor for a Chevy 250ci inline 6.

Since I'm working for economy rather than max power, I've created an adapter for the stock intake manifold. I'll put a photo on my web site as soon as I register the domain.

The TBI I'm planning is a 1 barrel from a Pontiac Sunbird 2.8L. It is also found on a number of smaller displacement GM cars of the mid to late '80s. The TBI bore is about the same as the Rochester carburetor throat. Since the TBI has no venturi, it should flow a lot more air. BTW, they are easy to find in U-Pull-It yards for about $25, complete with Throttle Position Sensor. While I was pulling mine, I grabbed the air cleaner for another $10. It should give a somewhat stock appearance, which is another of my goals.

The stock Sunbird injector is too small for a Chevy 250, but I've replaced it with an injector from a 454 ci truck engine (interchangeable). It should flow enough to support the Horsepower the 250 will produce. If I'm wrong, I'll probably switch up to a GM two barrel, and make a different adapter.