camshaft profile

[Phil Gillespie]

Originally Posted by Bored&Stroked

I'm not sure what everybody thinks a '5T' or '5-T' cam really is? I've never seen a 'T5' - did some of you guys transpose the number/letter up above?

I've seen the '5-T' markings on plenty of cast cams - both early ones (with the press-on gear) and later 4-bolt versions. I've not degreed any of these cams to see if the '5-T' is actually a grind number, or something else.

Have been "told" the 5T cam denotes its a truck cam and good for the low down torque.
Phil NZ

[flatjack9]

It's been my understanding that 59AB cams were marked 5T.

[Tim Ayers]

Originally Posted by flatjack9

It's been my understanding that 59AB cams were marked 5T.

All of the 59AB-style cams I have (approx. 6 cores) are all marked 5-T on the nose of the snout.

[Bored&Stroked]

This above posts are exactly why I posted about what does '5-T' actually mean . . . I bet it is NOT a grind number in that the one I looked at earlier today is from the mid-30's and I'm sure that Ford was not using the same grind in their 59X variants. If for no other reason that the valve angles changed after the early 40's. My bet is that I can find a lot of cams marked with '5-T' and they will not be the same grind . . .

I'm wondering if 5-T is just a generic part number . . . or . . . anybody really know ????

[21stud]

Originally Posted by Bored&Stroked

This above posts are exactly why I posted about what does '5-T' actually mean . . . I bet it is NOT a grind number in that the one I looked at earlier today is from the mid-30's and I'm sure that Ford was not using the same grind in their 59X variants. If for no other reason that the valve angles changed after the early 40's. My bet is that I can find a lot of cams marked with '5-T' and they will not be the same grind . . .

I'm wondering if 5-T is just a generic part number . . . or . . . anybody really know ????

That would be nice to find out, did ford used same profile after valve angle change? Hopefully someone has degreed these pre AND postwar 5T cams?
and how much this angle change actually is? is it even noticeable?
attached photo is from 37-38 era just to show markings.

[Bored&Stroked]

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You'd have to degree them in the appropriate block in order to truly make sure that the graph is correct for the given cam. I just may have to do that "some day". LOL

[Phil Gillespie]

Similar discussions in the past on 5T" cams!! Would be nice to get a true definitive answer on this one.
Phil NZ

[21stud]

Did some search about this. I hope it's not too much offtopic...

I quoted here member Pete's post #195 from this old topic: https://www.fordbarn.com/forum/showt...t=8767&page=10

''As a side note, when Ford moved the valves farther away from the cylinders in 1946 to alleviate cracking between the valve seat and cylinder, they elected to go cheap and did not change the indexing on the cam.
The technical explanation for this is long and involved but the basic reason was tooling cost because they knew there were going to be major changes to the engine in 1949.
The cams from 1946 to 1948 were ground on the same index as the 1942 and earlier ones.''

According this, cam timing/ degrees changed as late as 8ba introduction???

[Bored&Stroked]

Given Pete and his knowledge, that would not surprise me one bit. Also, I bet very few (if any) of the aftermarket cam grinders really did anything different for 32-42 engines versus 46 - 53 engines.

Lastly, the '5-T', or '5T' markings are even cast into the cores of many of the cams - which again tells me that it is not a specific grind related nomenclature as I doubt Henry would have had multiple castings for multiple grinds . . . for example the comment about the 5T being a high torque truck cam.