1997 Chevrolet Express 1500 Questions

Unanswered 1997 Chevrolet Express 1500 Questions

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Hello and thank you all for helping. I have changed fuel pump, all spider injectors, complete distributor, cap, rotor, spark plugs, throttle body cleaned, plenum cleaned and new seals, engine has great compression ...
If I replace the spark plug of my 1997 Chevrolet Express Van 1500, 5.7LV8, what is the gap of the spark plug?
I was just wondering how to go about changing the headlight bulbs in my 97 express 12 passenger?
Van overheated.. I changed the knock sensor, changed oil and coolant still knocks ....can not excel over 20pmh or hear knocking / pinging. Recently changed thermo, distributor, adjusted timing, tune up and put B12 ...