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Generation III Internal Engine
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Need some Part numbers : Main/Rods bolts

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Old 04-24-2012, 07:36 PM   #1
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Default Need some Part numbers : Main/Rods bolts

I can't seem to find anything other than studs... which I read somewhere you have to line bore the block or something becayse they clamp differently?

So, I'm needing the part numbers for GM or ARP main bolts

ARP need maching to work on factory rods too correct? its Keltech? that works like stock.. Part number for them too?


Thanks in advance guys...
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Old 04-24-2012, 10:16 PM   #2
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12560272 & 12560273 for stock main cap bolts, & 12556127 for the side bolts.
11610158 for the stock LS6/LS1 rod bolts.
ARP recommends resizing when using their rod bolts.
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Old 04-25-2012, 09:22 PM   #3
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Thanks man...
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Old 04-25-2012, 10:59 PM   #4
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I don't know if this will end up saving you money, but the main bolts & the side bolts can be reused.
The main bolts are torque to angle, & can be reused. The side bolts are TTY, & they can be reused. The side bolts need a ring of silicone (or, sealer) near the head of the bolt, to keep oil from coming through. When removing the original side bolts, you'll see a ring of (red) sealer around the head.
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Old 04-26-2012, 02:00 PM   #5
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Well, if I don't need to spend the money on main bolts then I wont..

I couldn't remember if they were torque to angle, or torque to yield. Since they're torque to angle in theory I dont need to replace them, yes?
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Old 04-27-2012, 09:43 AM   #6
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Quote:
Originally Posted by k5383 View Post
I couldn't remember if they were torque to angle, or torque to yield. Since they're torque to angle in theory I dont need to replace them, yes?
Yes, you are correct...TTAngle can be reused.
And, in theory, the little side bolts shouldn't be reused bec they are TTY. However, there are a number of knowledgeable people here who do reuse them.
In addition, the TTA bolts have a new, final application angle, per GM. It is now 85 degrees, rather than the former 75 degs. However, before applying 85 degrees to your older bolts, I would (if I was you) find out if 85 degrees applies only to newer manufactured main bolts. It just could be that GM has changed the manufacturing process to accommodate 85 degs.
In any event, you can be safe applying 75 degrees to your orig bolts.
Hope this helps.
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Old 04-27-2012, 09:43 AM
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