The ARP 114-3602 is a high-performance cylinder head bolt kit
engineered for demanding applications where reliability and
strength are non-negotiable. Manufactured from premium 8740 chrome
moly steel, these fasteners are heat-treated to 200,000 psi tensile
strength?significantly exceeding aerospace-grade standards and 15%
stronger than Grade 8 bolts.
Key Features:
- Premium 8740 chrome moly alloy rated at 200,000 psi tensile
strength
- Hex head design with reduced wrenching profile and wide-area
flange
- Vertical rack heat-treatment ensures complete and uniform heat
penetration
- Thread rolled after heat-treat for superior fatigue
strength
- Centerless ground for exceptional concentricity and
straightness
- Includes hardened, parallel-ground washers for even load
distribution
- Wide-area flanged head eliminates need for valve train removal
during retorquing
- Select applications feature undercut short bolts to equalize
stretch and prevent head gasket failure
Manufacturing Excellence:
ARP's exacting manufacturing process sets these fasteners apart
from competitors. Each bolt is cold-forged to ensure molecular
integrity, then placed vertically in precision racks for
heat-treatment?not tumbled in baskets like lesser products. After
heat-treat, bolts are centerless ground through approximately ten
precise cuts to achieve near-perfect concentricity. This attention
to detail ensures cylinder heads and gaskets align effortlessly
during assembly.
Post-Heat-Treat Thread Rolling:
Unlike competitors who thread fasteners before heat-treatment
when material is softer, ARP thread rolls after heat-treat. While
this process is significantly more expensive and harder on tooling,
it delivers approximately 1000% better fatigue strength?a critical
advantage in high-stress applications.
Installation Notes:
The reduced wrenching hex and wide-area flange design allows
cylinder head retorquing without removing valve train components,
saving valuable time during engine assembly and maintenance. The
included hardened washers ensure accurate torque readings and
uniform clamping force. Always retorque fasteners after initial
engine run-in to compensate for head gasket compression.
Trusted by professional engine builders across all forms of
motorsports, ARP Pro Series fasteners represent the pinnacle of
cylinder head retention technology. Each fastener is stamped with
the ARP logo as your assurance of quality and zero-defect
manufacturing standards.