ACDelco R45S conventional spark plugs for an original ignition system.
If it is a stock original engine and ignition system the gap would be .035".
The 1990 Chevy Celebrity engine is distributorless, the ignition is handled by a combination of the engine control module(computer) and the ignition control module. You did not mention which engine the car has. If your car has the 4 cylinder engine the ignition control module is below the intake manifold at the rear of the engine. You can follow the spark plug wires to it. The coils are mounted to the ignition control module. If your car has the V6 the ignition control module is near the starter and again you can follow the spark plug wires to it. Again the coils are mounted to the ignition control module.
It depends on what heads and ignition system you're using. You'll have better luck with AC plugs in a Chevy.
It is important to gap the spark plugs of an engine. The spark plug gap measurement for this engine is 0.044 inches.
Spark plug gap is 0.060
The 1989 Chevrolet 350 cubic inch engine spark plug gap is dependent upon the engine application. The most common spark plug gap for the Chevy 350 engine is .027.
small block Chevrolet with HEI ignition is 45
spark ignition engine is also known as petrol engine. but in diesel engines the fuel is burnt due to the high compression of air.so there is no need of spark plug
It is .045
If there is any residue on the spark plug, it will not produce a sufficient spark for the engine ignition.
typical spark plug gap for this engine is 0.035 inch