Why drivers choose XOTIC PERFORMANCE
Secure the bottom end. Build with confidence.
Designed to secure the crankshaft main bearing caps in Ford Small Block 289 / 302 applications. The kit brings together 10 main studs and the supporting hardware listed below for your engine build.
Main-cap clamping
Supports consistent clamping between the main bearing caps and engine block for a stable bottom-end assembly.
Matched hardware
Application-specific studs and supporting fasteners supplied together for your engine build. Tools and assembly lubricant are included as listed below.
Limited Lifetime Warranty
Covered by the XOTIC PERFORMANCE Limited Lifetime Warranty. View the warranty for terms and coverage.
Your application
The right fit comes first.
Browse the compatible applications below, or check your exact vehicle before adding this product to your cart.
Engine swap or a custom setup? Confirm your application with our team. Ask XOTIC
Inside the box
Know exactly what arrives.
Included components for this product.
| Qty | Component |
|---|---|
| 10 | Main studs |
| 10 | Nuts |
| 10 | Hardened parallel washers |
| 1 | Socket |
| 1 | Allen wrench |
| 1 | Fastener assembly lubricant |
Engineering details
Small details. A solid foundation.
Main studs secure the bearing caps to the engine block. Correct hardware, careful preparation and the specified assembly procedure help establish consistent clamping across the bottom end.
A secure foundation.
Main studs help secure the crankshaft main bearing caps to the engine block. This kit uses XOTIC 7200 steel alloy main studs.
Hardware that works together.
Use the studs and supporting fasteners specified for your engine. Confirm the component sizes and positions before assembly.
Preparation matters.
Follow the kit instructions for thread preparation, lubricant placement, tightening sequence and torque. Check the main bearing bores and clearances during assembly.
XOTIC 7200 / Material comparison
Tensile & yield strength.
Two measures of strength. Explore the comparison for XOTIC 7200 alloy and 8740 chromoly steel.
Tensile strength
The maximum tensile stress a material withstands before failure.
XOTIC 7200 series
232K PSI
8740 chromoly steel
222K PSI
Yield strength
The stress at which a material begins to deform permanently.
XOTIC 7200 series
212K PSI
8740 chromoly steel
201K PSI
The original comparison identifies an M14 × 237 specimen.
Original method note: ISO 6892-1:2016 or ASTM A370 / ASTM E8/E8M in the US.
Material specification
220–240K PSI
Strength specification
The published tensile-strength range for XOTIC 7200 main studs is 220,000–240,000 psi. Tensile strength describes the material under tension; it is not an installed clamping-force or horsepower rating.
View the test documentation
The linked ATRONA report records a 240,000 psi tensile result for a submitted stud tested in May 2020. This result applies to the submitted sample.
View source reportSee the details
Behind the product.
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Before you begin
A good install starts here.
Review the instructions and any application-specific requirements before you begin.
Before you order
Will this fit my vehicle?
This kit is specified for Ford 289 and 302 small blocks. Use the vehicle checker above to confirm your exact application. For an engine swap or an unusual setup, contact XOTIC before ordering.
Are tools and assembly lubricant included?
Yes. The included sockets, Allen tools and assembly lubricant are listed in the kit contents. Check the installation procedure for any additional equipment needed for the complete job.
Should the main bearing bores be checked?
Yes. Check the main bearing bores for size, roundness and alignment after changing the fasteners. If correction is needed, have the machine shop use the final assembly fasteners, lubricant and specified torque when checking and machining the main tunnel.
How does the warranty work?
Review the warranty policy for coverage, eligibility, and claim requirements.
Read warranty termsRegister your warrantyCalifornia Proposition 65 warning
WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov
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