GSC Billet Cams for 2008-2021 STi
GSC Power-Division Billet Camshafts for the 2008+ STi. S1, S2 and S3 cams are available. Sold as a set of 4 camshafts.
Vehicle Fitment:
2008-2021 Subaru STi
*EJ257 Dual AVCS
7026S1 S1 Cams (268/268)
Good for stock turbo or up to 500 WHP (GT35R) upgrades. Upgraded valve springs are required; Beehive valve springs are recommended but not required.
7026S2 S2 Cams (272/272)
These cams are built to suit the high horsepower Subi's. With a power range of 500 WHP and up, you need some certain mods to utilize the true potential of the S2: built motor, with a built/ported head, and a good engine management system. Upgraded valve springs are required; beehive valve springs are recommended but not required.
7026S3 S3 Cams (282/282)
These cams are built to suit the high horsepower drag STi. With a power range of 750-1000 WHP and a rev range of 4500-9500 RPMs, you need some certain mods to utilize the true potential of the S3: built motor, with a built/ported head (clearanced for lift), and a standalone engine management system. Upgraded valve springs are required; beehive valve springs are recommended but not required.
Install Notes:
• Check Pictures for cam placement. Long nose = Left Side, short nose = Right Side
• Due to the lobe size, head castings will need to be filed down slightly for clearance (Please check during install)
• Proper break in and running high zinc oil is a must on flat tappet engines
• Must be installed by an experienced technician
• Check AVCS advance during install - must be done by experienced engine builder
Vehicle Fitment:
2008-2021 Subaru STi
*EJ257 Dual AVCS
| Cam | ADV Duration | Duration @ 0.040" | Peak Lift | Center Line |
| S1 Intake | 268° | 225° | 10.80mm | 125° |
| S1 Exhaust | 268° | 225° | 10.40mm | 128° |
| S2 Intake | 272° | 230° | 10.80mm | 125° |
| S2 Exhaust | 272° | 232° | 10.40mm | 128° |
| S3 Intake | 282° | 240° | 11.50mm | 130° |
| S3 Exhaust | 282° | 240° | 11.50mm | 128° |
7026S1 S1 Cams (268/268)
Good for stock turbo or up to 500 WHP (GT35R) upgrades. Upgraded valve springs are required; Beehive valve springs are recommended but not required.
7026S2 S2 Cams (272/272)
These cams are built to suit the high horsepower Subi's. With a power range of 500 WHP and up, you need some certain mods to utilize the true potential of the S2: built motor, with a built/ported head, and a good engine management system. Upgraded valve springs are required; beehive valve springs are recommended but not required.
7026S3 S3 Cams (282/282)
These cams are built to suit the high horsepower drag STi. With a power range of 750-1000 WHP and a rev range of 4500-9500 RPMs, you need some certain mods to utilize the true potential of the S3: built motor, with a built/ported head (clearanced for lift), and a standalone engine management system. Upgraded valve springs are required; beehive valve springs are recommended but not required.
Install Notes:
• Check Pictures for cam placement. Long nose = Left Side, short nose = Right Side
• Due to the lobe size, head castings will need to be filed down slightly for clearance (Please check during install)
• Proper break in and running high zinc oil is a must on flat tappet engines
• Must be installed by an experienced technician
• Check AVCS advance during install - must be done by experienced engine builder
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