Can someone help with this cam ID?

[j_anderson]

Couldn’t get my timing dialed in. Acted like timing was off a tooth so took the cover off to take a look. Timing marks were aligned. Decided to pull the cam. I bought this cam 20+ years ago used and it went in the engine. Once engine was built it sat on a crate for 20+ years.

Without finding anything obvious with the timing mark alignment, I need to ID the cam. I was told it was a MoPar purple cam and I bought it around the year 2000. I am not finding anything online when searching the numbers stamped on the end. Is there a cross reference sheet to the actual MoPar part number somewhere?

Here are some photos

 

[abodyjoe]

looks like a mp purple cam. not sure on the numbers though.

 

[abodyjoe]

Chrysler High Performance Cam Data

 

[j_anderson]

Chrysler High Performance Cam Data

Thanks. I already looked at this sheet and do not see the numbers that are stamped on the end of my cam on that sheet. Is there some kind of cross-reference sheet that I’m missing?

 

[PRH]

Since most MP cams have different lift from one grind to the next, carefully measuring the lobe lift and multiplying by 1.5 will often tell you which cam it is.

 

[ch1ll]

The stamped number does not correspond to any mopar cams.

 

[ch1ll]

 

[PRH]

Mopar cam ID lore:

Mopar Purple Shaft Color Codes?

 

[j_anderson]

Since most MP cams have different lift from one grind to the next, carefully measuring the lobe lift and multiplying by 1.5 will often tell you which cam it is.

Using a pair of micrometers to measure here is what I am seeing

1.571 - Base Circle & Lobe Lift

1.253 - Base Circle

1.571-1.253 = 0.318 - Lobe Lift

 

[Brooks James]

looks like a mp purple cam. not sure on the numbers though.

Careful, I've seen purple on a Crane before

 

[Brooks James]

Using a pair of micrometers to measure here is what I am seeing

1.571 - Base Circle & Lobe Lift

1.253 - Base Circle

1.571-1.253 = 0.318 - Lobe Lift

.318x 1.5 rockers equals .472 lift
.318 x 1.6 rockers equals .504 lift

Using a pair of micrometers to measure here is what I am seeing

1.571 - Base Circle & Lobe Lift

1.253 - Base Circle

1.571-1.253 = 0.318 - Lobe Lift

 

[PRH]

.318 lobe lift x 1.5 = .477

Probably a .474 or .484 cam.

 

[Brooks James]

.472 and .504

 

[j_anderson]

.318x 1.5 rockers equals .472 lift
.318 x 1.6 rockers equals .504 lift

Thank you!

I’ve got the factory rockers. How do I know if they’re 1.5 or 1.6?

 

[PRH]

Stock rockers are 1.5

 

[PRH]

.318x 1.5 rockers equals .472 lift
.318 x 1.6 rockers equals .504 lift

I think your calculator might need a new battery.

 

[Brooks James]

I think your calculator might need a new battery.

Ok, educate me

 

[PRH]

.318 + .159(1/2 of .318) does not equal .472

 

[Brooks James]

.318 + .159(1/2 of .318) does not equal .472

Sorry the formula I found must have been incorrect