Hudson 309742, 306344 and 304078 cam profiles by Crane Cams

Kdancy

Just got the profile back for the 309742 cam I sent Crane for profiling. I also included the #306344 and 304078 profiles.
Also want to add a note from Ivan concerning the profile---

Kerry,

The cam report says:

Lift  .365

Duration at .040 lift:   275 degrees  (duration at .050 is 219.6) both intake and exhaust

Lobe Split:   113 degrees
      ** Base circle is intake size (1.559) minus lift (.3666) = bc of 1.1924


I have had in my hands was from Dany
Spring.  Its specs were these:

Lift: .358"

Duration at .040": 228 degrees

Lobe Split 113

Base circle:    1.214"

The Isky .446" lift full race cam has less duration than your Crane report
of 309742--263 degrees at .040" versus 275 degrees.  Flatheads do not
generally respond to this increased duration like a typical overhead valve
engine.  What is the history of your cam?

Measure the base circle and compare with Hudson practice.  I would not run
this cam in any of my Hudsons.

Cheers,
Ivan

dwardo99

Well, just for what it's worth, my first good-running Hudson (and the fastest of all) was a '51 Hornet with a '56 engine. Being young, I took out the hydraulic cam and put in a flat-top 7X cam and solid lifters, cuz I figured it would give me more power. That car ran really strong and the idle and drivability were very good. I drove it as my every day car for a long time and I'm sure the cam chain eventually stretched but I never changed it. The only trouble I ever had with the engine was it was hard to start when hot because the head was milled rather generously. My point is, strictly as an armchair observer, your cam specs look very radical and I doubt the flat top in my car would have run so nicely if that were really the spec. Go figure. 

Kdancy

Dwardo, take a look at it again---Robert at Crane clarified it.

dwardo99

Will do. Could be a reading/comprehension error.