53 cam for auto

I talked to Tommy (Desoto291Hemi) and have decided to wait a couple of weeks in replying him to when I get back to Minnesota. Then I can get the actual numbers and applications I have used in a couple of situations, which is what he really wanted.

At that time, I will probably compose a document on everything I have learned about this and post it to a separate thread. Anyone needing any information now can PM me.
 
Here's what I mean: the total duration is similar for intake an exhaust for most of these stock cams. For the EAB, I would guess the 247 figure is more believable than 269, but maybe both are wrong (or right!). Any ideas?

Default Re: 53 Mercury camshaft
49-51 ford "B" cam
.305 lift
int. opens 5*btc - closes44*abc set.017 - 229* total
exh. opens 48*bbc -closes3*atc set.019 - 231* total

52-53 ford "E" EAB cam
.328 lift
int. opens 21*btc - closes68*abc set.017 - 269* total
exh. opens 56*bbc - closes11*atc set.019 - 247* total

49-50 merc "8CM" cam
.338 lift
int. opens 10*btc - closes50*abc set.014 - 240* total
exh. opens 50*bbc - closes10*atc set.016 - 240* total

51-53 merc "1CM" cam
.333 lift
int. opens 5*btc - closes51* abc set.017 - 236* total
exh. opens 47*bbc - closes9* atc set.019 - 236* total
 
Given the disparity of the intake duration given for the "EAB" from all of the others, I would assume that is was recorded or transcribed incorrectly, and 247 is probably correct. Anyone who knows more about this can certainly correct me if I'm wrong. This leaves a toss-up between the "EAB" and the "8CM" as to which is the "hotter" stock cam. I have a gut feeling that it would be the 8CM, as I believe there will be more flow with a fully opened valve with .010 more lift than you would by opening the valve 3 1/2 degrees sooner and closing it 3 1/2 degrees later. Of course, this is assuming similar lift profiles, but I have a hard time imaging that Ford engineers would us radically different profiles on cams that are really quite similar.
 
When I built my 260" Merc I degreed both an 8CM and an EAB. The EAB intake duration measured 244 deg as did the exhaust. The 8CM measured 242 and 237 respectively.
However, the 8CM was 206/206 @ .050 lift whereas the EAB was 202/205.

8CM lift was .330 at 0 lash and EAB was .325 so that's a near wash.


I went with the 8CM due to the increased duration at .050 and a closer lobe separation of 109 vs the EAB at 111.


The engine runs very well and is quite strong with 3.54 gears and 29" tires in a '41 Town Sedan.


Terry
 
Thanks Terry, this is very informative. I have an NOS EAB cam in hand but no easy way to degree it since my block is at the machine shop. I measured 0.327” lift with calipers though, so right in line with your measurements and others in the web. Ken
 
Where on the cam do I look for the 'type' it is? I pulled one out of my attic last week that I think came from the same cracked merc block I got my 4" crank from 25 years ago.
 
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