Hey everyone, I was considering getting a new set of Bosch injectors from FIC for my 92, The original Multecs are OK but I was wondering what you guys think, if I should go with the Boschs what size should I use 22 lb. or 24 lb. my Vette is stock with 73,000 miles
If your LT1 is stock, it is currently is running well and you don't have symptoms of any injector-related problems, you don't need to change injectors.
If it were me in the above situation, and I just couldn't resist taking some injector-related action, I'd pull to the stock injectors and send them to a reputable injector service to have them cleaned and flow tested, then put them right back in the engine.
With a stock engine, the switch from the OE Delco Multech injector to a Bosch of the same flow rating will not result in any useful performance increase and, in fact, they'd likely not result in any measurable improvement.
Also, with a stock engine, you do not want to go to an injector capable of higher flow because you will likely loose performance, not gain it. Why? 1) You don't need the extra fuel at wide-open-throttle because the engine will run rich and 2) after installing "bigger" injectors you'll have to pay someone to recalibrate the engine to preserve part throttle drivability and "fix" the problem with too much fuel at wide-open throttle.
Now...if you have problems with drivability or fuel pressure, then you should consider injector replacements but only after having properly diagnosed the problems which are causing issues with drivability or fuel economy.
Bosch injectors from FIC are well-marketed and, indeed, could be a useful improvement on an engine which demonstrates problems with injectors or has been modified such that it needs higher-flow injectors, but to change the injectors just because people in the Internet say you should do so on general principle is not a wise idea.
