Description
| 7026S1 | ADV Duration | Duration @ 0.040″ | Peak Lift | Center Line |
| Intake | 264° | 226° | 10.80mm | 125° |
| Exhaust | 264° | 222° | 10.50mm | 128° |
GSC Power-Division S1 Camshaft Set for EJ257 Dual AVCS – 08-21 STI
GSC Power-Division S1 Camshaft Set for EJ257 Dual AVCS – 08-21 STI
$1,245.50
GSC Power-Division billet S1 camshafts for the 2008+ STI EJ257B With Dual AVCS. Good for stock frame turbo or up to 500 WHP (GT35R) upgrades. Upgraded valve springs are required; Beehive valve springs are recommended but not required.
- 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
This product may not be available for local pick-up. Contact us for more details.
Compatibility
- 2008-2021 STI
Camshaft Install
- All high-performance camshafts should be cleaned, inspected, installed, and timed by an experienced, SAE-certified mechanic or a skilled high-performance engine builder.
- Before installing new camshafts, please ensure that you replace or inspect rollers/lifters, rocker arms, and all oiling seals and surfaces. Always replace any type of flat tappet/bucket style lifter with new OEM components.
- Always check valve spring pressures before installation; never assume pressures are correct. Ensure that the chosen springs have adequate pressure as well as clearance for both coil bind and retainer to seal interference.
- When installing camshafts, make sure to use proper assembly lube on cam journals and on lobes with roller rockers. DO NOT USE ENGINE OIL ON THESE SURFACES! We suggest using Redline® or equivalent assembly lube.
- For flat tappet engines, please use the included Camshield® grease on the lobe surface and tappet face only; the sides of the tappet and tappet bore should have assembly lube applied.
- Degree/time camshafts using the opening and closing events provided on this cam card.
- Always install new timing components if any wear is present. Ensure that all pulleys, belts, and gears meet OEM specifications.
- Before the initial start-up of your engine, check all of the following valve clearances: valve to piston, valve to valve, valve to spark plug, and valve to block. With the use of a high-performance camshaft, all of these clearances will differ from OEM and can cause failures if contact is made when the engine is hot or cold. Be sure to make 8-12 rotations of the crankshaft to verify that there is no contact in any of these areas.
- Ensure proper oil pressure is achieved and that the oiling system is primed before starting the engine. Using an external pressure primer or filling the oil pump with assembly lube is highly recommended. If you do not prime the system before firing the engine, assembly lube will be wiped away, causing catastrophic failure of the lobes and journals.
- Synthetic oils must NOT be used during camshaft break-in. Conventional oil must be used with the same viscosity as suggested by the OEM. High-performance “break-in” oils may be used, as well as special ZDDP additives.
- When performing start-up, use the following sequence:
- Run the engine for the first 10 minutes at 2,000-2,500 RPM. Ramp to this RPM ASAP!
- For minutes 10-20, run between 1,500-4,000 RPM with gradual variation.
- After 20 minutes, shut the engine down and let it cool completely to ambient temperature (1-2 hours). When cool, change the engine oil. Refill with new engine oil and filter.
- Run this oil for the next 1,000 miles or 20 hours of engine use. You are more than welcome to dyno-tune or race on this oil change as the cams are being broken in
