Anyone know what the stock 8 cams are stamped? Im trying to figure out if mine are oem of not. They are stamped 4f17 on the intake. Cant see the exhaust right now.

 

The 4F17 looks more like a date code

2004 June 17

 

Could be but i cant see any other markings...

 

Get some pics.

I know on the stock 4g63 cams, there is a large letter, Just behind the #1 cam journal

 

Ok still no pics but i mic'd the cams. Base diameter for in/ex was 30mm. Intake measured at 36.57mm, exhaust was 35.49mm. Now that makes the intake lift at valve around 11.17mm and exhaust 9.33 (at a 1.7 rocker arm ratio that i read we have.)... no other markings on these other than a white dot at the cam gear end right at the last section. Maybe ER could chime in since they are close with gsc and all...

 

are they hollow ?? if so stock

 

I cant tell it they are hollow, but there are holes cast into them.

 

Any etched markings on the front face of the cams?

30mm x .03937 = 1.181 Base circle

36.57 x .03937 = 1.440 Intake toe

35.49 x .03937 = 1.397 Exhaust toe

1.440 - 1.181 = .259 Intake lobe lift

1.397 - 1.181 = .216 exhaust lobe lift

.259 x 1.7 = .440 Intake net lift
.216 x 1.7 = .3672 Exhaust net lift

I had to convert from metric to SAE.
From what I know on the DSM 4g63 cams, these cams are a bit bigger.
Most DSM 4g cams stock net lift is in the .320-.330 range, there are a couple a bit larger, but still under the .370 lift.

The base circle measurement you posted is what I am used to finding, so they appere not to be a regrind.

 

stock cams so