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how can you tell if the head is cracked from the exhaust side
No way man
get a new phone
If it hurts
they can be cracked.
The only positive way to tell if a cylinder head is cracked is to remove it and have a specialist pressure test it.
To tell if the head is cracked, you have to remove it from the car, so you will replace the head gasket, anyway. Take the head to a machine shop and have it magnafluxed to see if it's cracked.
take it to the hospital.
Then tell your dad the his dad is going to tell his friend to back off and yeah.
Tell your mum how you feel about your dad.
tell your dad but make sure he wont tell your mom
you can use your dad's phone