The BTR Cylinder Head Bolt Kit (BTR98545) is a direct equivalent to the Chevrolet Performance 12498545 head bolt kit, built for 1997-2003 GM LS engines at a lower price. Each kit covers one cylinder head, so two kits are needed to complete a full engine build.
- Part Number: BTR98545
- Application: GM LS-Series, 1997-2003
- Equivalent To: Chevrolet Performance 12498545
- Fits RPO Codes: LS1, LS6 (5.7L), LQ4/LQ9 (6.0L, pre-2004), LM7 (5.3L, pre-2004), LR4 (4.8L)
- Bolt Breakdown: (8) M11 x 2.0 long bolts, 155mm length; (2) M11 x 2.0 short bolts, 100mm length; (5) M8 x 1.25 side bolts, 45mm length
- Bolt Type: Torque-to-yield (TTY) — cannot be reused once torqued
- Fitment Note: Fits 1997-early 2003 casting dates, which use three different bolt lengths
- Type: Cylinder head bolt kit
FAQ
What engines is the BTR98545 head bolt kit designed for?
1997-2003 GM LS-series engines, covering RPO codes LS1, LS6, LQ4/LQ9 (pre-2004), LM7 (pre-2004), and LR4.
Is the BTR98545 kit compatible with GM's factory head bolt kit?
Yes — it is a direct equivalent to the Chevrolet Performance 12498545 head bolt kit.
Why choose BTR98545 over the GM factory part number?
It offers the same quality as the Chevrolet Performance 12498545 kit at a lower price.
What bolts are included in the BTR98545 kit?
Each kit includes (8) M11 x 2.0 long bolts at 155mm, (2) M11 x 2.0 short bolts at 100mm, and (5) M8 x 1.25 side bolts at 45mm — enough to service one cylinder head.
Can BTR98545 head bolts be reused?
No. These are Torque-to-Yield (TTY) bolts and should be replaced any time the cylinder head is removed.
