intake duration: 270
exhaust duration: 270
intake center line: 108
exhaust center: 112
lobe sep. : 110
Any comments on these data?
I cannot find a cam with similar specs, please suggest one :)
For what application?
What firing order? The 351W cams will work in the 302 also.
This one is a tad bit wilder than the Crane 260H, a little bit more tame
than the Crane 2030.
Look at those & see if the total lift of these is what you're looking for.
As a general rule, at 0" lift (not 0.050") in a small block Ford, a cam
with under 260 degrees duration is mild, 260-270 is a little more than
stock, 270-280 is versatile and good for all around power, 280-290 is
hot, 290-300 is very hot, 300-320 is road race and 320+ is drag race.
Valve lift will be from 0.45" on the low end to 0.55+" on the high end.
On Fri, 24 Aug 2007 10:45:33 +0200, "HÃ¥ken Hveem"
If you are looking at a modified cam, you need to consider
the cams with the 351 fireing order. Ford used the
alternate fireing order in the factory performance engines
like the Cobra and their Motorsport crate engines because of
a tendency of cylinders 7&8 to crossfire even in a stock
engine. All you need to do to accmmodate the change is swap
a couple of plug wires. This will greatly expand your
options since most cam grinders only use the 351 firing
order for anything other than stock or mild cams. Also,
before you start selecting a particular cam spec, you need
to decide on exactly what kind of performance you need and
what the rest of the drive train components and tire sizes
will be. The specs you have given do not consider ramp
rates or timing specs beyond generalities. You can also
make considerable difference in lift and timing with rocker
design ratio. If you are looking at a roller cam setup, you
may need entirely different specs for the same application
since roller allow greatly accelerated opening rates and
lift under the curve. Don't just buy a cam because it
sounds good on paper. The cam grinders can be immensely
helpful if you will contact them with as much info as
possible on what you are working with and what you want it
to do. An otherwise decent combination can be completely
screwed by getting too aggressive with the cam. It can very
quickly go from I wish it had just a little more to I can't
stand to drive this thing.
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