Most advertised durations range from .000 - .006. There really isn't a
standard. Thats why so many engine builders recommend you compare cams using
the duration @.050.
Doug Myers
-------------
'99 Dakota RC/SB 5.2L/5-speed/3.92SG (soon to be 360 powered)
K&N Gen II, Hughes Stage 1 Intake, 180 T-stat, MP cam & lifters,
MP Timing Chain, MP headers, MP catback, MP plug wires, Accel Supercoil,
Custom Computer by Ron Zimmer, Centerforce Dual Friction Clutch
<Pukeloser@aol.com> wrote in message news:37.19349a85.28a6cf79@aol.com...
> There will be no increase in "advertised" duration which is usually
measured
> from .000" to .000" tappet lift. If you are asking will tehre be more
valve
> lift at .050" tappet lift then, yes but the actual length of duration is
not
> increased only the lift at a given duration with exception of .000" lift.
>
> Basic math .000 x 1.7 = .000 no change in total duration
>
> .050 x 1.7 = .085 (ie .035 more valve lift @ .050
tappet
> lift)
> .0294 x 1.7 = .050 (ie .050 valve lift is now achieved at
> .0294 tappet lift)
>
> John S
>
> 95 cc 318 auto, transgo shift kit, HE stage II TB and intake, HE 1418 cam,
> 1.6 Roller rockers, MSD digi6+, MSD HVC coil & 8.5 wires, Hp cap + rotor,
MP
> PCM, DT headers, Gibson exhaust (3" from headers back, no cat), 180 stat,
> autolite 3923's, progear DR timing chain, auburn LSD, 4.10 gears, superior
> axles, K&N X-stream filter system, MP valve covers, 24# FMS injectors, IAT
> adjuster
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