ARP cylinder head stud kit
BMW 3.0L 24V F80, M3, M4 (S55B30)
N55 Engine Block, you MUST Drill and Tap the (4) 9mm holes in the engine block to make them 11mm holes. This way all the engine block holes are 11mm, and fit ALL (14) 11mm Studs.

Spring data:
Seat pressure - 75lbs @ 36.50mm
Open (lift) pressure - 155lbs @ 10.00mm
Spring coil bind - 23.20mm
Max lift - 12mm
Rate - 8 lbs./mm
Wide end spring outer diameter - 24.40mm
Wide end spring inner diameter - 17.60mm
Narrow end spring outer diameter - 21.00mm
Narrow end spring inner diameter - 14.30mm
Kit includes:
Single springs - 24 pcs. SPR-FE20N54-BE
Rretainers - 12 pcs. RET-BMN54-TI (5mm)
Retainers - 12 pcs. RET-BMN54-TE (6mm)


|
Product detailed specification |
|
|
Bore size |
84.00mm |
|
Stroke |
89.60mm |
|
JE Pistons compression ratio (CR) |
9.5:1 |
|
OEM compression ratio (CR) |
10.2:1 |
|
Dome volume (CC) |
-14.7cm3 |
|
Compression height (CH) |
32.40mm |
|
Pin diameter |
22mm |
|
Features |
Accepts Turbo and Nitrous; coated FSR skirt |
|
Fits for |
BMW - 3.0 24V Turbo (N55B30) |

|
Product detailed specification |
|
|
Model number |
BMIVN-1055S |
|
Head diameter |
32.00mm |
|
Stem diameter |
4.97mm |
|
Length |
104.9mm |
|
Material |
Black nitrided stainless steel |
|
Fits for |
BMW E60, E90, E91, E92, E93, E82, E88, E89, X6, Z4, F01 - 3.0 (N55B30, S55B30) |

|
Product detailed specification |
|
|
Model number |
BMEVI-1055S-HS |
|
Head diameter |
28.00mm |
|
Stem diameter |
5.96mm |
|
Length |
112.9mm |
|
Material |
Sodium filled |
|
Fits for |
BMW E90, E91, E92, E93, E82, E88, E89, X6, Z4, F01 - 3.0 (N55B30, S55B30) |



