Dennis

Take a look at ECZ-A  and tell me if you think that could be Hoosiers cam?

I have one on my desk this moment and at .050 it measures 231 duration.

Pretty close on all numbers for a coincidence ???

I"m beginning to think Hoosiers correct in his assumption that there are a bunch of B7A preformance cams grouped together and sold over the counter.

Oldmics

I think this thread is diverging into the 285 hp and S/C camshaft thread on the Racing page.

LOL!!!

The ECZ-A cam converts into a B6A-6250-C service part number.  This part number also shows up in the 1949-1957 Police Interceptor Parts List as a 1956 312 Fordomatic application.  It is also mentioned in the Eickman Y-Block Book.

The specs are 20-70-72-18 checked at .014/.017 .013/.016.  This figures into 270 deg with 38 deg overlap.  I assume the lobe lift is .264".

The numbers do appear to be quite close.

Perhaps when they packaged the cam, the wrong one was packaged?

John, when did you purchase this cam and do you recall what part number was on the package or on the camshaft itself?

Regards,

Dennis

     

Re B7A performance cams being grouped together and sold over the counter.

We've discussed this off-line, but if you look at PSL #426, it somewhat states just that.  Note the description used is "High Performance Engines", not "Supercharger" engines.  It appears in these PSL's when it applied specifically to the 300 hp S/C engine, it stated "Supercharger".  If it applied to 312 8V (and sometimes including Supercharger) the description used was "High Performance Engines". 

It's a bit strange that Ford waited until May 1959 to tell the dealers the 290 deg EDB-D S/C cam was superceeded with the 302 deg EDB-E S/C cam.  

It is my opinion that PSL#426 may be the directive that superceeded the "mystery" 285 hp cam with the EDB-E/B7A-C S/C cam.  This may explain why many believe the 285 hp cam and blower cam are one and the same, according to PSL #426 they are.  Of course it states the P&A (service part) number remains the same.  However, I don't recall anyone ever coming up with an actual Ford part number for the original 285 hp camshaft.

Unfortunately, the superceeded cam information or engineering part number was not included in this PSL, and to confuse matters the same Service Part number (B7A-6250-C) was retained. 

Regards,

Dennis

 

Dennis:

I would have purchased this cam in the mid-'60s sometime.  I do remember that on the tube was printed (stamped) EDB-6250-?, don't remember the suffix letter.  That was crossed out and B7A-C hand printed on the tube.  The back of the cam is stamped by hand, probably with individual stamps, B7A-C.  I looks like the specs for the B6A-C closely match mine.  My cam has over 20,000 miles on it, and my checking proceedure could be flawed, so the specs could be slightly distorted.  I would expect some lobe nose wear, so lift on mine may be slightly lower.  Oldmics, do the cam doctor specs for the kit cam come close to what mine are?

John - "The Hoosier Hurricane"

Hoosier

The cam in the kit (kinda like Cat in the Hat ) is speced at

I/O=22*@.015

I/C=58*@.015                 ACTUAL MEASUREMENTS TAKEN FROM CAMSHAFT ARE THE SAME

E/O=66*@.015

E/C=14*@.015   --------------  EXCEPT FOR E/C WHICH ACTUALLY MEASURES  9*@.015

SPECED DURATION IS 260

Measured duration is 212@.050 and 261 @.015

I dont believe this is Hoosiers cam in his 56 T Bird.

Oldmics

Here is a scan from my 1961 edition Canadian parts book. It uses the word high performance customer demand

marv

57 High performance - customer demand -          1 B7A 6250-C

7/16" - 14 x 1" tap at front end – 14 teeth on dist. drive gear - 21. 54" long-

(5) 1. 9255"/1. 9265" brg. journals - grooved No. 3 journal - high lift cam -

EDB-6250-E identification mark

It's a bit strange that Ford waited until May 1959 to tell the dealers the 290 deg EDB-D S/C cam was superceeded with the 302 deg EDB-E S/C cam.  

It is my opinion that PSL#426 may be the directive that superceeded the "mystery" 285 hp cam with the EDB-E/B7A-C S/C cam.  This may explain why many believe the 285 hp cam and blower cam are one and the same, according to PSL #426 they are.  Of course it states the P&A (service part) number remains the same.  However, I don't recall anyone ever coming up with an actual Ford part number for the original 285 hp camshaft.

Dennis, Perhaps this was issued when a second (or Third) run of cams was ordered or manufactured. The Canadian letter indicates customer demand. That makes me wonder why the customers didn't simply turn to the aftermarket for performance Cams.

Frank/Rebop

Bristol, In ( by Elkhart) 

 

One could around and around on this.  The one thing I noticed in PSL-426 was use of the term "High Performance Engines" and not "Supercharged Engines". 

The awareness of a high lift cam is indicated in the 1957 Ford Supercharger Shop Manual, in PSL-348 dated 12 Jun 57, PSL-358 dated 10 Oct 57, and TSB-253 dated 4 Mar 57.  From the info in these documents, they appear to all refer to the 290 deg EDB-D, not the 302 deg EDB-E cam.      

Perhaps feedback was being received from customers and dealerships questioning the different B7A-C cam specs and part number suffix change from D to E, and PSL-426 was issued to clarify this change.  It's also possible earlier dated information was released, just no one in this circle has discovered it yet.   

It's interesting the Canadian Parts Catalogue indicates "customer demand".  The US parts book that I have does not state this for the B7A-C cam, but does include all the other description.

Perhaps the aftermarket wasn't used because there wasn't a comparable cam available, or perhaps it had to do with being legal in a particular class.  In 1961 or earlier, what aftermarket cam supplier catalogued a cam with 290 deg and .450" lift?  I wonder what the definition of "customer demand" is?  I wonder how many B7A-6250-C EDB-D and EDB-E cams were actually sold by Ford?  Was this the hot rodders cam of choice or did most back then run Isky, Clay Smith, Engle, or even stock regrinds in their Y-block.     

It is interesting how additional bits of information surfaces on this subject of the Ford high performance and supercharged camshafts. 

Regards,

Dennis

east coast hotrodders choice of cam,(at least in my group) was a dempsey wilson grind, or the clay smith grinds. not sure if dempsey wilson was that large a cam supplier, but do know it seemed to outperform all other grinds.