Head bolt Torque specs for 2011 5.3l Vari Cylinder Enginr

[piro222]

I need the head bolt torque and sequence specs for the 5.3l variable cylinder engine from a 2011 Suburban. These heads have 10 mm head bolts only, no 8mm bolts. I can find up to 2008 5.3l torque specs but those have 8mm head bolts along the periphery of the head (10mm bolts in the center).

[95 S_Trucker]

The LS gen 4 (07-13)engines have 11mm/8mm bolts. There are 15 bolts per head

The LT gen 5 (14+) engines only have 10 bolts per head.


Are you sure you have a 2011 5.3?

[piro222]

I guess I had some bad information. It is a 2011 Suburban 5.3l with 15 bolt heads. In that case, it should be the heads with the 2nd design bolts, and I already have that torque sequence and values, unless the bolts were redesigned again between 2008 and 2011.

Am I correct that the bolts were redesigned and not the head or block? In which case, if I were to work on a 99-04 engine, I should get 2nd design bolts when I replace them (since they are TTY bolts) and use the 2nd design torque procedure?

[95 S_Trucker]

I would order the correct bolts for the engine. 99-07 were still gen 3. (Gen 4 started in 05 on the trailblazer/envoy, 07 with the new body style trucks) there are some overlap years.

This is the procedure for the 2011 5.3.

[mongocanfly]

And dont reuse your old head bolts...they are tty one time use..

[piro222]

Thanks for the torque info.
I always use new bolts for TTY fasteners.

[crazy longhorn]

Rather than the stock TTY bolts, I opted for ARP .....more on the price, but you can reuse them...Longhorn

[71cadc10]

the difference between '1st design' and '2nd design' is the length of the bolts, so they are not interchangeable when buying a kit.
The block's threaded holes were changed, heads didn't change.

you must use the 1st design (8 longer bolts + 2 short ones) for the early engines...since the threads are deeper down in the blocks on 8 of the holes. You cannot swap to 2nd design bolts on these blocks. They won't reach the threads.