ARP Cylinder Head Studs for BMC B Series 12-pt Nuts

SKU: 206-4202 | UPC: 672036007973

ARP Cylinder Head Studs for BMC B Series 12-pt Nuts – Fits 1955-1980 MG MGA & MGB

ARP 206-4202 cylinder head stud kit equips BMC B-Series engines in classic MG MGA and MGB models from 1955 to 1980 with high-strength fasteners and 12-point nuts. These studs lock cylinder heads in place with consistent clamping force to resist gasket blowouts during high-rpm operation. Precision engineering allows heads and gaskets to seat perfectly without binding.

Key Features

• 8740 Chrome Moly Construction: Heat-treated to 190,000 PSI tensile strength for extreme durability under boost or high compression.
• Centerless Ground: Ensures perfect concentricity and straightness so cylinder heads align effortlessly every time.
• Post-Heat-Treat Thread Rolling: Boosts fatigue strength by 2000% over pre-heat-treat threading for long-term reliability.
• Black Oxide Finish: Provides corrosion resistance and smooth installation in engine bays.
• Includes 12-Point Nuts: Delivers secure, high-torque fastening specific to BMC B-Series heads.

Product Notes

• Kit contains complete set of studs and nuts for one cylinder head installation.
• Use ARP thread cleaner and lube for best results.
• Ships in protective packaging to prevent damage.

Installation Notes

• Professional installation recommended.
• Clean blind holes and threads meticulously before assembly.
• Torque studs in sequence to 55-65 ft-lbs using ARP specs. retorque after heat cycles.

This Part Fits

Year	Make	Model	Submodel
1955-1957	MG	MGA	1500
1958-1960	MG	MGA	1600
1961-1962	MG	MGA	1600 MKII
1962-1980	MG	MGB
1965-1980	MG	MGB GT
1956-1959	Austin-Healey	100-6	BN4

Why Choose ARP?

• Choice of professional engine builders for competition engines.
• Vertical rack heat-treatment penetrates fully for uniform strength.
• Exact tolerances match OEM patterns while exceeding strength limits.

Frequently Asked Questions

• Q: Will this kit fit my MG MGB engine?
  A: Yes, designed for all BMC B-Series 1.5L, 1.6L, 1.8L, and 2.6L variants in 1955-1980 MGA, MGB, MGB GT, and Austin-Healey 100-6.
• Q: What is the material and strength rating?
  A: Forged 8740 Chrome Moly alloy heat-treated to 190,000 PSI tensile strength with black oxide finish.
• Q: Does ARP offer a warranty?
  A: Lifetime warranty against manufacturing defects when installed per ARP instructions.

Shipping & Handling

• Method: UPS Ground or USPS Priority
• Availability: In stock – ships same or next business day
• Packaging: Compact box 7.75 x 5.5 x 1.6 inches
• Weight: 1.9 lbs