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Product details
JP Dansk JP-8112-0 is an 8mm cylinder head nut, the nut that clamps the cylinder head to its stud on air-cooled VW engines built with 8mm head studs. Air-cooled VW engines were built with either 10mm or 8mm head studs, and EMPI sells separate nuts, washers, and stud kits for each size, so the stud thread decides which nut you need. EMPI applies 8mm head nuts to Type 1 Beetle, Karmann Ghia, and Type 3 engines. Each Type 1 style head sits on eight studs, so an engine with 8mm studs throughout takes 16 nuts.
A hardened washer goes under each nut, and EMPI's matching part is the 8mm cylinder head washer, 98-0146-B. If you are replacing studs, EMPI's 8mm chromoly case stud kits come with hardened washers and hex nuts, for dual port heads (4020) or single port heads (4005).
Technical Details
- Manufacturer: JP Dansk
- Manufacturer part number: JP-8112-0
- Part type: cylinder head nut
- Thread size: 8mm
Fitment & Compatibility
For air-cooled VW engines with 8mm cylinder head studs, including Type 1, Karmann Ghia, and Type 3 engines so equipped. Engines with 10mm studs need the 10mm head nut instead.
Installation & Tuning Notes
Torque head nuts to the factory value for 8mm studs, in stages and in the tightening sequence from your shop manual, with a hardened washer under every nut.
Common Questions
How do I tell if my engine has 8mm or 10mm head studs?
Check a stud or an old nut with a thread gauge. For 10mm studs, EMPI's matching parts are the 98-0143-B nut and 98-0145-B washer.
How many head nuts does an engine need?
Eight per head, or 16 for an engine with 8mm studs at every position.
PMB Performance has 20+ years of air-cooled VW engine experience.
