Product Description:
This polished stainless steel hex-head bolt kit secures a compatible GM LS thermostat housing or water neck. It is intended for LS-series cooling-system service and engine assembly where the housing requires this fastener configuration.
| Producer | ARP |
|---|---|
| Product type | Thermostat housing bolt kit |
| Condition | New performance part |
| Material | Stainless steel |
| Head style | Hex |
| Quantity | One kit |
| LS1 / LS2 | Compatible thermostat housing and water pump combination |
|---|---|
| Other LS Gen III / Gen IV | Verify housing configuration and required fastener dimensions |
Select by the installed engine and component configuration. Vehicle year alone does not establish compatibility, particularly after an engine swap.
- One stainless steel hex-head thermostat housing bolt kit
- Companion washers
The housing and water pump determine the required bolt dimensions. Compare the actual housing, available thread depth and bolt seating before installation, especially with a replacement or aftermarket water neck.
| Location | Thermostat housing / water neck |
|---|---|
| Engine family | LS Gen III / Gen IV |
| Material | Stainless steel |
| Finish | Polished |
| Head style | Hex |
| Underhead length | 0.787 inch, approximately 20 mm |
- Inspect the hardware and clean mating threads before assembly.
- Confirm bolt length, seating and usable thread depth with the actual components.
- Follow current kit and component-manufacturer instructions for lubricant, tightening sequence and torque.
Where do these bolts install?
They secure the thermostat housing or water neck on a compatible LS engine.
Are these the polished stainless version?
Yes. This part number identifies polished stainless steel with hex heads.
What underhead length is listed?
The published underhead length is 0.787 inch, approximately 20 mm.
Will these fit an aftermarket water neck?
Compare its bolt requirements and available threaded depth before ordering.
Does choosing an LS engine family alone confirm fitment?
Confirm the actual housing and water pump combination as well.
If outside the lower 48 states please email us for a shipping quote: Orders@Hawksmotorsports.com
