TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

head bolt torque sequence?

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Old Jan 31, 2003 | 12:46 AM
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zr1 32 16 405's Avatar
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head bolt torque sequence?

i rebuilt the stock 305 heads and was wondering wat the spec torque sequence was
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Old Jan 31, 2003 | 08:46 PM
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From: Maple Shade, NJ
it would tell you in a haynes manual .. torque specs and sequence is the only thing those books are good for.
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Old Jan 31, 2003 | 09:02 PM
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I dont know the torque specifications of the top of my head but I do know, that if you are looking at the head with the exhaust ports pointing at you, start with the bolt in the middle of the head at the top and swirl yourself out ward. Thats the way. Hope that makes sense.
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Old Jan 31, 2003 | 10:28 PM
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From: Naples, FL
Car: 1991 Firebird
Engine: 383 stroker
Transmission: T-56
Don't forget to step torque them either. I usually go about 20, 40, 60, then finally 70-75ft/lbs.
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Old Jan 31, 2003 | 11:08 PM
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
The final torque is 65-68 ft/lbs. Sequence is as follows (attahed pic).

RBob.
Attached Thumbnails head bolt torque sequence?-cyl.jpg  
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Old Feb 1, 2003 | 12:01 AM
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Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
Don't forget thread sealer.
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Old Feb 1, 2003 | 02:08 AM
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zr1 32 16 405's Avatar
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thanks, i got the intake manifold off, i spent more time labeling all those dam vacumm tupes and egr crap than anything else.
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Old Feb 7, 2003 | 11:22 PM
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From: Elsa TX
Engine: 305
Transmission: 700R4
Yea im in the same boat, but in installing ported TPI heads with new intake.
I looked at the haynes manual and it says to torque them down at 65 ft lbs but other people tell me to torque them down at 70 or so which would be better?


Michael
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Old Feb 8, 2003 | 10:55 PM
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if the new intake is aluminum .. dont over torque them. Go the rated route
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