Hole in exhaust valve
My 1993 civic has burnt a hole in one of my exaust valves on my #3 cylinder for the second time ,I just did a valve job on it about 4 months ago. What is causing this to happen.

My 1993 civic has burnt a hole in one of my exaust valves on my #3 cylinder for the second time ,I just did a valve job on it about 4 months ago. What is causing this to happen.
Is it hard or worth it to put a new block in a 1993 Honda civic
I have checked everything, and all looks good. When I push the horn button there is a clicking sound from under the dash. Is there an inline fuse or relay I am not aware of.
This is a new problem with my civic, it shuts off when it gets warm. It starts from cold without a problem then I drive it 8-10 miles and it shuts off. Gas tank is half full and the car start back up after 30 minutes of letting it to cool off. The check engine light comes on after driving 3-4 miles and stays on until the engine is shut off. Please help
My horn doesn't click, make any sounds or react when I push the buttons. Does anyone have an idea as to whether it is an electrical issue or replacement/maintenance issue. Note: The SRS light is lit up and the there is a green adapter disengaged on the right side of the steering wheel. I will upload a picture for clarity if some one can help me.
Airbags
Driver side front airbags
Audio System
AM/FM radio
Convenience Features
Multi-function remote: trunk release
Seats
Front seat type: bucket · Upholstery: cloth
Airbags
Driver side front airbags
Audio System
AM/FM radio
Convenience Features
Multi-function remote: trunk release · Steering wheel: tilt-adjustable
Seats
Front seat type: bucket · Upholstery: cloth
Airbags
Driver side front airbags
Audio System
AM/FM radio
Convenience Features
Multi-function remote: trunk release
Seats
Front seat type: bucket · Upholstery: cloth
Tires and Rims
Wheel type: aluminum alloy
Airbags
Driver side front airbags
Audio System
AM/FM radio
Convenience Features
Multi-function remote: trunk release · Steering wheel: tilt-adjustable
Seats
Front seat type: bucket · Upholstery: cloth
Airbags
Driver side front airbags
Audio System
AM/FM radio
Convenience Features
Multi-function remote: trunk release · Steering wheel: tilt-adjustable
Mirrors
Exterior mirrors: power
Seats
Front seat type: bucket · Upholstery: cloth
Airbags
Driver side front airbags
Audio System
AM/FM radio
Convenience Features
Multi-function remote: trunk release · Steering wheel: tilt-adjustable
Mirrors
Exterior mirrors: power
Roof
Moonroof: power
Seats
Front seat type: bucket · Upholstery: cloth
Airbags
Driver side front airbags
Audio System
AM/FM radio
Brakes
ABS: 4-wheel
Convenience Features
Multi-function remote: trunk release · Steering wheel: tilt-adjustable
Mirrors
Exterior mirrors: power
Roof
Moonroof: power
Seats
Front seat type: bucket · Upholstery: cloth