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The Turbo City Hi-Flow throttle body (left) has larger throttle bores, shaved throttle shafts, radiused air inlets, and rounded throttle-plate screws. This unit is said to offer a 10-20 percent increase in airflow over the stock units capacity.
The stock fuel-pressure regulator found on the bottom of the injector plate is replaced with an adjustable unit. This allows for the fuel pressure to be adjusted over a range of 9 to 13 psi. By increasing fuel pressure you can enrich the fuel mixture to match the increased airflow of the new throttle body.
An injector spacer is used between the injector plate and the throttle body. This spacer is said to increase airflow by 5-6 percent and to provide a wider injector spray pattern for better fuel atomization.
Once the throttle-body has been assembled using a combination of new and original parts, it can be installed on the motor. First, install the throttle-body spacer from the kit with a gasket on each side, then bolt on your upgraded throttle-body.
The final part in the kit is Turbo Citys Air Flow Enhancer. This unit is riveted to your air cleaner base and replaces the stock air-cleaner spacer. The tapered style is said to improve airflow to the throttle-body by 6-10 percent.
Here is the new Hi-Flow throttle-body in place on our engine. It looks stock, but thats just an illusion. We even opted for a new pair of matched injectors, as one of ours was leaking. Although not part of the Powerpackage, this is a great option to consider.
Everyone can use more horsepower. One example of a simple upgrade that provides more horsepower is the Powerpackage kit from Turbo City for 87-95 GM throttle-body fuel-injected GM engines.