Stock 200 cam

[64.5 TX Stang]

What are the stock specs on the 200 cam. I have seen conflicting info from .388" of lift to .232" of lift. Does anybody know for sure? I bought a mild performance cam on the cheap, and when I spec it I want to know what kind of gains it has over the stock cam.


Thanks!!

 

[Anlushac11]

8)

There is a thrad similar to this somewhere in tehpast, may ahve to search for the answer.

I thougth it was .390" lift and 242 deg duration.

 

[64.5 TX Stang]

Yeah I found that thread, and thus the confusion.

 

[CZLN6]

Howdy Andrew and All:

There are two 200 cams. The early ones from 65 to somewhere in the late 70s used the following spec-

Dur 252/256 at the valve, with a slight retard built-in. I have never seen .050" specs, but suspect that they are very lazy. The lift is at .348 on the stock 1.52:1 rocler arm.

The later 200s, late 70's to 84 used-
Duration of 256, in a built-in advanced setting. The lift is .372" on the OEM 1.52:1 rocker.

I say built-in on both of the OEM cams, because all 200s specify the same timing gears. Whereas, 250s change cam timing with timing gear several times, we think.

While the later cam may look like a nice upgrade using FoMoCo parts, it is not likely worth the effort. I don't know what brand the cam is you bought, but if it is from a reputable manufacture I have no doubt that the .050" duration will reflect a more agressive lobe ramp. Most aftermarket performance cams with durations in the stock 200 came range list a .050" duration of 200 to 208 degrees. My guess is that the stock 200 cams .050" duration would be more in the mid 180 for a much lazier profile.

I have had a long time goal of setting up a jig with a degree wheel and dial caliper to measure the .050" for myself, But the opportunity has never come up. I don't know anyone that has replace a stock OEM cam with either an early or a late. And measuring on a worn motor would tell me nothing more than what I already know- Old, wornout and sloppy.

So, I guess I've told you all I know, for sure. I hpe it helps you.

What is the brand name of the cam you bought? Did it have a spec sheet with it?

Adios, David

 

[falcon60]

Andrew,David and all-
When I disassembled the '68 200 I used for my build,I set up the degree wheel on the old engine and checked the numbers the stock cam provided. The numbers at .050 were 178/179....just as suspected very mild and lazy. I used a tight chain so the specs are accurate.

Terry

 

[addo]

That is invaluable. It will help with correcting DD type programs.

 

[64.5 TX Stang]

The cam has no spec sheet with it hence the very inexpensive price I got it for. It was reground (alegedly sp?) by Performance Camshaft out in LA California. In the bottom of the box there was a sheet from horse races in the early 80's so I suspect that is the vintage fo the regrind. I am luck that I have a friend who is into machining I will borrow a degreed rotary table from him and a dial gauge and go to town on it one evening in the next few months.

 

[CZLN6]

Howdy Back;

Terry- thanks for that info. Just as I thought, only worse. As usual the "Devil is in the details". thanks again.

Andrew- please share your findings too.

Adios, David

 

[64.5 TX Stang]

I will let you know what the cam specs are when I get around to taking care of it.

 

[falcon60]

Andrew,David and all-
When I disassembled the '68 200 I used for my build,I set up the degree wheel on the old engine and checked the numbers the stock cam provided. The numbers at .050 were 178/179....just as suspected very mild and lazy. I used a tight chain so the specs are accurate.

Terry

A couple other things worth knowing are that the lobe separation angle was 109 degrees and the cam was originally installed with the intake centerline at 112 degrees....three degrees retarded.

Terry