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The 120 LSA cuts down on overlap, don't want to be blowing boost out the exhaust... bad for smog too.
I think OEM valve springs are very weak, GM wants 200,000 miles out of these so cut down on lift helps the larger intake that is also fighting against boost. Less guide wear too. GM wants to use the SMALLEST cam posible for any HP target, and the least lift. So the Lt4s cam is the most dependable, best on smog for the application, the LT1 cam should make more power.
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
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