Quote:
Originally Posted by Eldi Z
What do you mean in terms of Big?
What is the Lift/Duration on the LT1 and what is it on the LT4?
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LT4 Cam Specs
Part Number 12642245
Duration @ .050 in. (int./exh.) 189°/223°
Valve Lift (int./exh.) 0.492 in./0.551 in.
Lobe Separation Angle 120°
tiny in fact.
L86 Camshaft Specs
Part Number 12629512
Duration @ .050 in. (int./exh.) 200°/207°
Valve Lift (int./exh.) 0.551 in./0.524 in.
Lobe Separation Angle 116.5°
LT1 Cam Specs
Part Number 12629512
Duration @ .050 in. (int./exh.) 200°/207°
Valve Lift (int./exh.) 0.551 in./0.524 in.
Lobe Separation Angle 116.5°
LT2
204 / 219
.551 / .551
Revised Cam Profile And Phasing
Now that the exhaust flows about as freely as the intake, the exhaust valve lift is increased by 1mm to match the intake's 14.0-mm lift, which improves exhaust valve flow rate from 122 to 125 grams/second. Duration is also increased, and the range of authority of the cam phasing is now 62 degrees (though the controller seldom orders more than 50 degrees).
It would be my opinion that power is related to intake duration and lift.
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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.