Inline PRO K20C1 K20C4 M12 Xtreme Duty Head Stud Set (upgrade from M11)
Inline Performance
Inline PRO K20C1 K20C4 M12 Xtreme Duty Head Stud Set (upgrade from M11)
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Machined in Virginia
Fitment help
Description
Our Honda K20C1 K20C4 M-series M12 Extreme Duty head studs are made from the Highest Grade Premium American Alloy that have gone through rigorous heat treatment and testing. With a minimum tensile strength of 230kpsi, these are not prone to hydrogen embrittlement like the L19/H11 material and can be handled without worrying about failures. We use a True-beam design all the way through the length of the stud resulting in better clamping force and torque values (it's not necked-down or undercut like others). "Only settle for the Best!"
The kit includes: Studs, nuts, washers, lube, and instructions.
- Engine block must be re-threaded to accept the larger M12 stud using our custom M11 to M12 transition tap kit (sold separately).
- No modification is necessary to the cylinder head (use with stock OEM dowel pins).
Specifications
| SKU | IP-HS-M12K20C1 |
|---|---|
| Category | Head Gaskets |
| Brand | Inline Performance |
Fitment
This part is listed for the engine families below. If your build is unusual — a swap, a stroker, an aftermarket head — send us the combination and we will confirm fitment before you order.
Shipping & Returns
Orders ship within the United States from our shop in Springfield, Virginia. Weight-based rates are calculated at checkout, with free shipping over $500.
Shipping outside the US? We do not take international orders through the website — call 703-455-5805 or email info@inlinepro.com and we will arrange the order and payment with you directly.
Returns must be approved before shipping, made within 30 days in original condition, and are subject to a 25% restocking fee. No returns on used parts, electronics or special orders.