Hoosier

Dennis K has made me aware of two different cams that BOTH bear the same Service Part #

 of B7A-6250-C

You are already aware of the 290 version.That is engineering part # EDB 6250-D.That is the Phase 1 blower cam.The other is engineering part # EDB-6250-E which is the Phase 2 blower cam.

Sounds to me like you have the Phase 2 blower cam which is 302 duration with .295 lift.

The "kits" cam is a B6A-6250-E sporting engineering part# EDB-6250-B.

I do have the cam info on it and will send it to you.

Oldmics

I was also very surprised at the single diaphragm 55 style vacuum chamber as I always thought this kit got the sandwiched style of vacuum chamber with the ring of screws to hold the bellows together.



Another thing I noticed was instead of the garbage can style of fuel filter this kit shows a glass bowl carter style filter.



marv

i have a set of the ECZ-C heads in the kit, quite small combustion chambers....lots of compression comparatively speaking

Old Mics:

My cam is 270 degrees at running clearance, is neither of the cams you mention.  Also, running it at  .020 and .025 clearance, per the B7A-C spec, is noisy.  It sounds and runs best at .014 and .016.  That's why I felt that Ford was putting all their performance Y cams in one basket and calling them all B7A-C.

John - "The Hoosier Hurricane"

hey john, i read an article where the C heads in the kit were broched ( shaved .060 from the factory.

 lincoln/merc. y-blocks &mel's                                                               bucyrus, ohio.

So have we solved the great camshaft mystery? I see no mention of anything Isky in the discussion. I would like to know the specs on the 302 cam just in case I need a few more Horses.

    John, Interesting on the clearance numbers. I found EXACTLY the same thing on the Engle reproduction, and can't believe the clearance ramps are that close between Ford and Engle 50 years later. Appearantly the motors want even more duration than those cams!

Frank/Rebop

Bristol, In ( by Elkhart) 

John,

"270 deg at running clearance", please clarify what the running clearances are that you measured 270 deg., .020/.025, .014/.016, or ??? 

Also what are the lobe lifts?

Thanks.

Regards,

Dennis

 

 

 

 

 

Dennis:

I believe the readings were at .014-.016.  Timing 16-74, 73-17.  Valve lift with 1.54 rockers, In .426, Ex .405.  Duration @ .050 is 230.  It doesn't resemble any Y cam that I'm aware of.  The 33 degrees of overlap seems rather small compared to the factory specs for blower cams with over 75 degrees. 

John - "The Hoosier Hurricane"

Hoosier

Is the cam installed straight up or did you use any advance/retard ?

Oldmics

Oldmics:

I didn't degree the cam in, but from the specs it indicates it is in the "split overlap" position, which means I probably used a 2 degree advance key originally, and chain wear has returned it to it's straight up position.

John - "The Hoosier Hurricane"