



Springs data:
Seat pressure - 77lbs @ 40.10mm
Open (lift) pressure - 180lbs @ 10mm
Spring coil bind - 27.00mm
Rate - 10.30lbs/mm
Max lift - 12.20mm
Outer spring outer diameter: 26.50mm
Outer spring inner diameter: 18.70mm
Inner spring outer diameter: 21.60mm
Inner spring inner diameter: 13.80mm
Set includes:
Dual springs: 24 pcs. SPR-FE20BE
Titanium retainers: 12 pcs. RET-BMB48/TE and 12 pcs. RET-BMB48/TI

Athena Racing 330 series Cooper Ring cylinder head gasket set.
For specific high horsepower applications, engine performance can be significantly improved by using Athena Cooper Ring gaskets, that are supplied with INOX steel ring. This technology outperforms conventional fire ring solutions.
Cooper Rings are oversize (also fits for oversize bores).
Part number: 330037R
Gasket thickness: 1.10mm
Bore size: 90.50mm
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Part number starting with 330 |
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Athena advantages |
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Reinforced material |
Asbestos free composite raw material OE approved |
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Stainless steel ring (AISI304) |
Separate stainless steel rings assure maximum sealing around cylinder bore also on NOS and/or turbo charged engine where boost is over 2 bars. No head and block machining required |
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Silicon beading |
Silicon-based beading is applied on critical areas to improve sealing around all cooling water and oil passages |

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Product detailed specification |
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Bore size |
84.50mm |
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Stroke |
89.60mm |
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JE Pistons compression ratio (CR) |
9.5:1 |
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OEM compression ratio (CR) |
10.2:1 |
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Dome volume (CC) |
-14.7cm3 |
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Compression height (CH) |
32.40mm |
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Pin diameter |
22mm |
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Features |
Accepts Turbo and Nitrous; coated FSR skirt |
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Fits for |
BMW - 3.0 24V Turbo (N55B30, S55B30) |

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Product detailed specification |
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Model number |
HEVN-1021D |
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Head diameter |
30.50mm |
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Stem diameter |
5.45mm |
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Length |
108.65mm |
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Material |
Black nitrited stainless steel |
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Fits for |
Honda K20 K24 |


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Product detailed specification |
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Model number |
SEVI-1050 |
| Head diameter |
29.00mm |
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Stem diameter |
5.45mm |
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Length |
95.15mm |
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Material |
Inconel |
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Fits for |
Subaru BRZ, Scion FR-S - 2.0 (FA20, FA20D) |
