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ARP Head studs
Todays engines often use high compression pistons or high boost, which demands optimum sealing between the cylinder head and the engine block.
ARP uses 8740 chrome moly steel to most of their bults, that is rated far superior to "aircraft" quality. Each stud is precisely heat-treated to a nominal tensile strength of ca 1400 N/mm². The stud is then given ten slight cuts which results in an exceptionally straight part. Lesser quality studs are not even centerless ground – the material is thread rolled in bar stock form, usually prior to heat-treatment.
ARP studs are thread rolled after heat-treat, which gives them about 1000% better fatigue strength than those studs that are threaded prior to heat-treatment.
The undercut (U/C) studs has a slightly less diameter on the unthreaded part, which means that the bolt streches more and thus creates the same clamping force at lower torque. In practice this equalizes the stretch, which makes for a more consistent clamping force. These studs are only availiable for selected applications. |
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Head stud kit
Prodnr: ARP-275-4701
Delta
2.0l 4cyl 16v
HF
MSRP: 3420 SEK excl. VAT
Price: 2900 SEK excl. VAT
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Head stud kit
Prodnr: ARP-275-4FA5
Delta/Musa/Y/Ypsilon
1.2-1.4l 4cyl 16v
176B9 M4, 188A5000, 198A7000, 843A1 M10
Price: On request
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Head stud kit
Prodnr: ARP-275-4L8V
Delta
2.0l 4cyl 8v
HF
MSRP: 2760 SEK excl. VAT
Price: 2340 SEK excl. VAT
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