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06-29-2020, 01:43 PM | #1 |
Scooby Specialist
Member#: 432652
Join Date: Oct 2015
Location: Gap, PA
Vehicle:2010 Subaru WRX STI 61K (Gray) |
ARP 625+ vs Cosworth PR7243 head studs
Getting my engine build together here soon and wondering is there are any differences between the two? I couldn't find anything on the cosworth studs
Both made from 625 tool steel Both 11mm (arps actually measure at 9.8mm diameter i believe) Both have a 260,000 tensile strength So why are the ARPs so popular and more expensive? Will i be okay to go with the cosworth headstuds for around 500whp? Engine build is a closed deck, 100mm wiseco pistons, BC I-beam rods, stock heads, and a Garrett 3582r turbo Thanks for the input
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06-29-2020, 02:44 PM | #2 |
Scooby Guru
Member#: 80649
Join Date: Jan 2005
Chapter/Region:
South East
Location: Columbia, SC
Vehicle:2000 2.5 Auto-X RSTi Sparkly |
You don't even need 625 for that level. You could do regular ARP 2000's and be fine. Maybe L19's if you're really worried.
Regarding the question, I'd wager because ARP has a much better name, is up front about their product, gives good instructions, and has a reasonable reputation for warranty. Cosworth on the other hand, has a good name.......and that's it in the Subaru arena. |
07-01-2020, 10:02 AM | #3 |
Scooby Specialist
Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:2004 WRX STI Black RalliSpec Shortblock |
Ya, ARP is more hands on with subie owners then cosworth and willing to spend the time with us. Also probably has something to do with marketing.
Also ARP lives and bleeds bolts, that is the main product of their business. So most of R&D goes to bolts. Cosworth has a lot of different products on the market so they can not concentrate as much on bolts as ARP dose. |
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