GSC P-D Mitsubishi Evolution 4-8 4G63 S1 Cams 268/268 Billet

GSC Power-Division S1 Billet Camshafts — 4G63T Evo 4-8, 268/268 (7008S1)

Built for stock turbo cars through a GT30/50 trim, and the appeal is that they cost you nothing at the bottom. No bottom end loss over stock cams — nothing but gains, and they promote faster spooling of an upgraded turbo. Gains of 30-55 whp depending on turbo have been seen from simply bolting them in.

Designed for a 3,000-8,000 rpm range, sized as a 300-450 whp camshaft. That's the daily-driven end of the Evo spectrum.

GSC's 7000 Series billet camshafts are 100% in-house cut and ground on the newest, most precise CNC machines available — the only readily available and affordable billet camshafts for the sport compact market. The lobe profiles are the same spec GSC is known for worldwide, giving strong power gains and smooth drivability.

The dark nitride coating aids wear and fatigue resistance, lubricity, and corrosion resistance. Made 100% in the USA.

Specs: 268°/268° duration. Billet construction. Sold as a pair, intake and exhaust.

Fitment: 1996-2005 Mitsubishi Lancer Evolution IV through VIII. 4G63T.

These work well on stock valve springs at the factory rev limit — one of the few cam upgrades that doesn't force a head-apart spring job. Idle is slightly rougher than stock, mild enough to stay comfortable on the street.

One install detail: if you're using aftermarket cam gears — AEM especially — check bolt length. Some gears are too thick for the OEM bolt on billet cams, and a 40mm underhead bolt may be required.