These are the GSC billet core camshafts built to suit the high horsepower Subaru WRX/STI’s from 2008 and on. If you have a highly built motor that consists of a larger turbocharger, and are making more than 500WHP, then the GSC billet core will help you in the top-end gains. The intake cams are 272 10.7mm, while the exhaust camshafts are 272 10.4mm.
Upgraded valve springs are required, and proper break in running high zinc oil is a must on flat tapped engines. Must be installed by an experienced technician.
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QUESTIONS & ANSWERS
Q: Break-in oil bluestreak49er 2 years agoAnswer
I see that they suggest a high zinc oil during break-in. Do you guys have a specific oil that you would suggest?
A: Any properly weighted oil with zinc additive will be fine, we carry the Redline additive if needed or there are many other oils at local auto parts stores that are meant specifically for break in.
Nick S. 2 years ago