Holley Performance Products TBI Adapter*17-45
Originally Posted by Jnca78
I just built a 383 stroker. It's now in an '88 Chevy Blazer 4x4. It had a stock 350. I bought a tbi from a friend. The ports are bigger on the new tbi then the stock one. I need to bolt it to the stock intake. I have a tbi spacer with the stock tbi port size. Is there an adapter that will funnel the port from the large port tbi to the small port intake?
is one solution GM also makes an ugly, expensive thing for this purpose. There's no reason why you can't take a file or die grinder to the adapter you have to enlarge and reposiiton the throttle holes where you need them for a lot less cost than a factory made adapter. But fitment is the least of your problems, the big bore TBI also brings much larger capacity injectors as well as more air. All of this needs a new chip, the computer in these speed desity systems has no way to understand this, it doesn't measure air flow it measures manifold vacuum, RPM and throttle angle for the size engine it was programmed to; then it calculates air and fuel flow as a reference number which is then looked up on a map which in turn controls injector duty cycle and ignition timing. Changes that affect engine size, breathing efficiency, and the ratio of manifold vacuum to RPM to throttle position all impact the calculation of air and fuel flow as well as the ignition timing.
Contact this guy for help <<< TBICHIPS Home | Harris Performance, INC