Why do you have to use New head bolts, install new gasket?

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Answers:

I want to buy a 12v automotive battery charger and need some help.Any suggestions??

Well, not knowing the year, vehicle or engine, I can only assume the reason you want to replace the bolts is because the manual told you to. If in fact the bolts are torque to yield style, then they MUST be replaced. This will be clearly stated in all manuals regarding your particular engine. Or, if the bolt torque specs are followed by a degree, they are "TTY" and must be replaced. As for the gasket, it is always replaced. Once compressed, the gasket material will not be able to properly conform again to the irregularities in the head and block surface. It WILL leak, you WILL have to replace it eventually if you want the job done correctly.

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Toyota 4Runner Rear Windshield Wiper Not Working?

NEW BOLTS TO ENSURE A GOOD TEMPER,GASKET ALL THAT EFFORT ONLY TO HAVE TO DO IT AGAIN BECAUSE A SMALL SCRATCH,CRACK PINHOLE,ETC.....

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What is wrong with my turn signal 04 F-150?

because they are a stretch fit, and can't be used again :(

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What is wrong with my car?

chances are that the new gasket will replace the one that you ripped taking the heads off in the first place, if its ripped, it will not seat and seal properly when reassembled, the new bolts are optional, as long as they are not broken or stretched or stripped. make sure that they are completely cleaned of any and all fod (foreign objects & debris) and that you put them back in the same holes that they were removed and torqued to specs

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I cleaned the leather on my dad's seats, and put leather lotion on, and the top skin (gray) broke. Now what?

I've seen the old ones used many times through the years, so you don't necessarily have to. But the old ones are strecthed and may be worn making it hard to get an accurate torque reading or even break.

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truck stalls when it hits a large amount of water?

Don't do it, and you'll find out why you should have done it.

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I used Trans X transmission fluid for leak, how long does it take to work?

you really need to have the head milled as well

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