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ADT88
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DEC 21, 05:05 PM
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Can you buy non TTY head bolts for a '99 3800SC?
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sleek fiero
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DEC 21, 08:26 PM
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I believe the originals are tty and if you order replacements they will be the same. personally I would go the other way and try to grt standard grade 10.9 replacements as they are stronger and reusable. sleek
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jelly2m8
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DEC 22, 03:35 AM
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I would disregard the previous advice and go on RockAuto and get the proper bolts and torque to GM spec. The 3800 is probably GM's most reliable engine for a reason.
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sleek fiero
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DEC 22, 10:54 AM
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The early 3800 (231 CI ) used reuseable head bolts and the later engines used TTY head bolts. If you build a performance engine the Builder will use grade 10.9 Head bolts or studs, hard washers and nuts depending on the build. If you are building a stock 3800 SC sure use a new set of TTY bolts. sleek
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pmbrunelle
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DEC 22, 01:00 PM
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Bolts themselves are not torque-to-yield or reusable.
It is the tightening procedure, relative to the yield strength of the bolt, that determines whether the bolt is stretched within or beyond its yield point.
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sleek fiero
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DEC 22, 05:40 PM
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sorry tty bolts are very different . Caterpillar and cummins started using them long before the auto industry. They are not reusable because they are stretched when they are tightened properly. they cannot be stretched a second time as hey will break. Trust me as I have built engines for the last 55 years. They used to have courses to teach the proper degree sequence to install these bolts.
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ADT88
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DEC 24, 03:22 PM
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