what is the bolt tightening sequence for cylinder heads on a 98 sebring lxi 2.5l?

Answer 1

Purchase a manual. There will be a pictorial of the tightening sequence.

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Answer 2

It's hard to describe. You can get a book from the auto parts store for just that car. Costs about $12-$15, and contains all the sequences, and torque specs. Or your local library may subscribe to alldata online. If they do you may be able to print out the data you need for as little as $0.10 per page.