Standards
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Ford Coyote Head Studs (5.0L Mustang GT, F-150 Coyote)
The Ford 5.0L Coyote V8 (Mustang GT 2011 onwards, F-150 5.0L, Bullitt, GT350) has an aluminum block with 4-bolt main cap and aluminum 4-valve DOHC cylinder head per bank, retained by 11 M12 head bolts per bank (10 inner + 1 outer). The factory bolts are torque-to-yield (TTY) and not reusable. Stock Coyote head bolt clamp force tolerates around 18 to 22 psi boost on a forced-induction build before head lift becomes a problem.
TorqBolt Coyote head stud kits (TB-COYOTE-MP35N) replace the 22 stock M12 TTY bolts with 22 M12 x 1.75 studs in MP35N (260 ksi) or Custom 465 (220 ksi). The 12-point nut is preferred for the Coyote because the cylinder head valve cover and cam carrier intrude on socket clearance.
Coyote head stud installation
- Remove factory head bolts in REVERSE of factory torque sequence (Ford service manual). TTY bolts not reusable.
- Chase all 22 M12 x 1.75 threaded holes per bank.
- Install studs hand-tight then back off 1/2 turn.
- Set head with new MLS head gasket (Cometic, FelPro Performance, or OEM-equivalent).
- Lubricate stud threads + under-nut washer face with TorqBolt moly lube.
- Tighten in 4 stages per Ford pattern (inner to outer): stage 1 at 22 ft-lb, stage 2 at 47 ft-lb, stage 3 at 70 ft-lb, stage 4 torque-angle 90 degrees.
- For high-boost (40+ psi roller-cam Coyote builds), use stage 4 torque-angle 110 degrees.
- Re-torque after first heat cycle.
Gen 1 / Gen 2 / Gen 3 Coyote fitment
The Ford Coyote architecture has evolved across three generations: Gen 1 (2011-2014, 412 hp), Gen 2 (2015-2017, 435 hp), Gen 3 (2018+, 460 hp). Head bolt count and pattern unchanged across all three generations, so a single TB-COYOTE-MP35N kit fits all variants. The Voodoo 5.2L flat-plane V8 (GT350) shares the same head-bolt pattern.
Installation best practice
Achieving the design preload is as much about the install method as the bolt: lubricant matters (published torque values assume 0.13 to 0.16 friction coefficient; anti-seize or moly-disulfide reduces friction 20 to 30 percent and over-stretches the bolt at the published torque). Direct bolt-stretch measurement with an ultrasonic gauge or stretch gauge over the bolt centerline cuts preload variation to under 5 percent vs torque-only at 25 percent. Race builders measure stretch.
Re-torque after first heat cycle (run engine to operating temperature, allow to cool overnight, re-check torque) recovers preload lost to embedment at the faying surfaces. Conventional alloy-steel and MP35N bolts benefit from re-torque; torque-to-yield (TTY) bolts are NOT re-torqued and are typically replaced rather than reused after disassembly.
Alloy choice vs build budget
For street + occasional drag (target 500 to 700 hp): heat-treated AISI 8740 chromoly at 200 ksi is sufficient. For sustained 700 to 1000 hp street/strip: Custom 465 H1025 at 220 ksi or L19 race-grade at 270 ksi. For 1000+ hp drag racing or roll-racing: MP35N at 260 ksi. The bottom-end limits (rod tensile, main-cap stretch, deck flatness) become the bottleneck above this level, not the bolt.
Request a Quote
Send a build sheet (engine variant, target boost, fuel, gasket choice) and we will return a firm quote within 24 working hours. Email info@torqbolt.com, call +91-22-66157017, or WhatsApp wa.me/912266157017.
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