2024 Silverado 5.3L L84 Head Bolt Torque & Sequence (and Intake Manifold)
By WhatSizeBoltEdited 11 min read
5.3L L84 head bolt torque per GM: 80 N.m (59 ft-lb) first pass, then 150 degrees (130 degrees on one left-head bolt), single-use bolts, numbered 1-10 sequence. Intake manifold bolts 10 N.m (89 in-lb) with thread locker.
The 5.3L L84 in a 2024 Silverado uses ten single-use head bolts per head, an 80 N·m (59 ft-lb) first pass and then an angle final pass — and it is not the LS procedure you may remember. Different torque, different angle, a different bolt count. Mix them up and the head gasket is where you pay for it.
What this article covers
One engine, one model year, one set of GM service-manual pages.
This page covers the 5.3L L84 V8 (VIN D) in the 2024 Silverado 1500. Every number and sequence here comes from GM’s own service-manual pages for that truck — the Fastener Specifications table plus the L84 installation procedures for the left head, the right head and the intake manifold — as reproduced by LEMON Manuals. GM’s table lists the same rows against both the L84 and the L87 (6.2L) procedures, but we only read the 5.3L pages, so treat this as a 5.3L guide. The 2024 Sierra 1500 carries the same 5.3L engine family, but its figures here are taken from the Silverado manual; check the Sierra’s own procedure before relying on this on a GMC. We make no claim about other model years.
L84 head bolt torque specs
Two passes: 80 N·m, then an angle. Only one bolt differs.
| Head | Bolt (GM’s label) | Qty | First pass | Final pass |
|---|---|---|---|---|
| Left side | Cylinder Head Bolt, M12 x 102 (callout 1) | 1 | 80 N·m (59 ft-lb) | 130° |
| Left side | Cylinder Head Bolt, M12 x 134 (callout 2) | 9 | 80 N·m (59 ft-lb) | 150° |
| Right side | Cylinder Head Bolt | 10 | 80 N·m (59 ft-lb) | 150° |
Source: the Fastener Specifications page of GM’s 5.3L/6.2L engine mechanical section, rows “Cylinder Head - Left Side Bolt Sequence” and “Cylinder Head - Right Side Bolt Sequence.” GM prints the first pass as “80 N.m (59 lb ft)” and the final pass as an angle in degrees. All three rows are marked single-use.
The bolts themselves
Ten per head, single-use, and the holes matter as much as the bolts.
| Spec | Value |
|---|---|
| Count | 10 per head |
| Left head | 1 x M12 x 102 + 9 x M12 x 134 (GM’s labels) |
| Right head | 10 x “Cylinder Head Bolt” (GM’s right-head page gives no length) |
| Type | Torque-to-yield / single use — replace every time |
| Thread locker on head bolts | Not called for in GM’s table |
| Socket size | Not given on GM’s pages — check the bolt head in your hand |
GM’s installation step carries this caution word for word: “This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fastener could cause damage to the vehicle or component.” The angle pass is what stretches a torque-to-yield bolt (see our torque-to-yield (TTY) bolts guide) past its elastic range, which is why a used one cannot give the same clamp load twice. The head gasket is single-use in the same table.
Tightening sequence
Ten bolts per head in two rows of five, center pair first, then outward in pairs.
Both heads use the same numbering. One row of five reads 9, 5, 1, 3, 7 and the other reads 10, 6, 2, 4, 8. So bolts 1 and 2 are the center pair, one in each row; 3 and 4 are the next pair out on one side, 5 and 6 the next pair out on the other side, then 7 and 8 and 9 and 10 at the two ends. GM’s step simply reads “tighten in sequence” against a two-pass spec; our reading is to run the whole 80 N·m pass in number order, then the whole angle pass in number order.
How the L84 differs from the LS
Same job, different numbers — do not carry an LS card over.
| LS Gen IV (our LS guide) | L84 5.3L (GM, this article) | |
|---|---|---|
| Main head bolts | ten 11 mm bolts | ten head bolts per head (left-head labels: M12) |
| First pass | 22 ft-lb | 80 N·m (59 ft-lb) |
| Angle | +90°, then +70° final | single final angle: 150° (130° on one left-head bolt) |
| Extra bolts | five 8 mm perimeter bolts (#11–15) | none listed in GM’s head-bolt rows |
| Single-use | Yes | Yes |
The left column is quoted from our own LS head bolt guide; the right column is GM’s L84 table. The practical lesson is that the L84 starts much higher (59 ft-lb against 22) and then makes a single angle turn, while the LS seats low and turns twice. Neither engine’s numbers transfer to the other.
How to torque L84 head bolts, step by step
The order GM’s installation procedure follows, one head at a time.
- Clean the block bolt holes of all dirt, debris and coolant, per GM’s caution above.
- Set a NEW head gasket on the block. GM: “Gaskets are stamped with orientation marks. Make sure ‘FRONT’ is visible on the top of the gasket and toward the front of the engine.”
- Set the cylinder head on the gasket.
- Install NEW head bolts and hand tighten. On the left head that is nine M12 x 134 bolts and one M12 x 102; on the right head, ten bolts.
- First pass: 80 N·m (59 ft-lb) on every bolt, in the numbered sequence.
- Final pass: turn each bolt +150° in the numbered sequence — except the left head’s single shorter bolt (callout 1, position 9 in GM’s figure), which takes +130°. Use a torque angle gauge.
- Repeat on the other head.
- Then rebuild up through the valvetrain: rocker arm pivot support bolts, rocker covers, in that order per GM’s head pages; the intake manifold is its own GM procedure (next section).
Intake manifold bolts: 10 N·m and their own sequence
Ten bolts, thread locker, and a different 1–10 order from the heads.
| Spec | Value |
|---|---|
| Bolt count | 10 |
| Torque | 10 N·m (89 in-lb) |
| Thread locking adhesive | Required (“Yes” in GM’s table) |
| Procedure | Hand tighten all ten, then tighten in sequence |
| Gaskets | NEW intake manifold gaskets, 8 of them |
The intake figure is numbered differently from the heads. One row reads 10, 6, 2, 3, 7 and the other 9, 5, 1, 4, 8. Bolts 1 and 2 are again the center pair; 3 and 4 go one way, 5 and 6 the other, then 7 and 8 and 9 and 10 at the ends. Hand tighten all ten first (“Intake Manifold Bolt - Hand tighten [10x]”), then tighten in sequence (“Tighten in sequence [10x]”).
Other fasteners on this job
What GM lists for the parts you will touch between the heads and the manifold.
| Fastener | Torque |
|---|---|
| Valve rocker arm pivot support bolt (8x per head) | 30 N·m (22 ft-lb) |
| Valve rocker arm cover bolt (9x left, 10x right) | 10 N·m (89 in-lb), in sequence |
| Valve rocker arm cover insulator retainer (3x) | 9 N·m (80 in-lb) |
| Intake manifold bolt (10x) | 10 N·m (89 in-lb), thread locker, in sequence |
The rocker cover bolts also have their own numbered figure in GM’s table; we did not reproduce it here, so follow GM’s figure for that order.
Tools and parts for the job
An angle gauge is not optional here, and the intake bolts sit low in a click wrench’s range.
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Torque angle gauge
Both the 130° and 150° final passes are angles, not ft-lb figures. A 1/2" drive angle gauge is the only way to turn 150° and know it was 150° — eyeballing it on a bolt being stretched is how heads end up under-clamped.
1/2" torque wrench
A calibrated click wrench for the 80 N·m (59 ft-lb) first pass. Check the low end of its range before using it on anything lighter — the 10 N·m intake and rocker cover bolts are only 89 in-lb.
3/8" inch-pound torque wrench
The intake manifold bolts and rocker cover bolts are both 10 N·m (89 in-lb). A wrench that reads in inch-pounds keeps that range accurate.
5.3L L84 head bolt set
Replacement head bolts for the 5.3L. They are single-use by design — match the set to your engine and confirm the left-head M12 x 102 / M12 x 134 mix.
5.3L head gasket set
Fresh head gaskets — GM lists the gasket as single-use too. Match the set to your engine and follow the “FRONT” marking on the gasket.
Common mistakes
Five ways an L84 head job comes back.
- Reusing the head bolts — they are single-use and already stretched. GM says to install NEW ones.
- Using LS numbers — 22 ft-lb and +90°/+70° belong to the Gen III/IV LS, not this engine.
- One angle for every left-head bolt — nine take 150° but the single shorter M12 x 102 takes 130°.
- Skipping the hole cleaning — coolant or debris in a bolt hole means a false torque reading and damaged threads, per GM’s own caution.
- Leaving out the thread locker on the intake manifold bolts — GM’s table requires it, with its own prep steps.
Frequently asked questions
What is the head bolt torque on a 5.3L L84?
Per GM’s 2024 Silverado 1500 5.3L service manual, each head bolt gets a first pass of 80 N·m (59 ft-lb), then a final angle pass: 150° on the right-head bolts and on nine of the ten left-head bolts, and 130° on the single shorter M12 x 102 left-head bolt. The bolts are single-use.
Can I reuse L84 head bolts?
No. GM marks the head bolts single use and the installation step says to install a NEW torque-to-yield or single use fastener. A used bolt has already been stretched and will not clamp the same way.
Is the L84 head bolt procedure the same as an LS?
No. Both L84 heads use a ten-bolt pattern in two rows of five, numbered 1 and 2 at the center and working out to 9 and 10, with no separate perimeter-bolt pass in GM’s L84 rows. The torque values are different too: 80 N·m plus an angle, not the LS’s 22 ft-lb plus two angles.
Why does one left-head bolt get 130 degrees?
GM lists the left head as one “Cylinder Head Bolt” (M12 x 102, 130°) and nine “Cylinder Head Bolt” (M12 x 134, 150°). GM does not explain why on the pages we read; the shorter bolt simply has its own final angle.
What is the L84 intake manifold bolt torque?
10 N·m (89 in-lb) on all ten bolts, hand tightened first and then tightened in GM’s 1–10 sequence. GM’s table also marks the bolts as requiring thread locking adhesive.
Which way does the head gasket go?
GM says gaskets are stamped with orientation marks and that “FRONT” must be visible on top of the gasket and toward the front of the engine.
What socket size are L84 head bolts?
GM’s pages do not give one, so we are not publishing a size. Match the socket to the bolt head you are holding.
Keep going
Bottom line: each L84 head bolt takes 80 N·m (59 ft-lb), then +150° (+130° on the single shorter left-head bolt), in the numbered 1–10 order, with new single-use bolts in cleaned holes. The intake manifold bolts are 10 N·m (89 in-lb) with thread locker in their own 1–10 order. None of it is the LS procedure — and where GM’s figure and ours disagree, GM’s figure wins.
Video plays from YouTube when clicked. Always confirm torque values against your service manual.