Cam Timing Question for 2.7 with SC cams

[rwest]

Hi,

I’m slowly putting back together my ‘77 2.7 using Mahle RS pistons and cylinders, SC cams ground by Web Cam running on the Bitz EFI.

First question relates to TDC; I’m using the Stomski Digidex with his TDC finder and in his video he says that the pulley markings may be off- my parting seam lines up with the edge of the “V” cut- 2.3 degrees off. I did the procedure twice with same result. Does this seem possible? Picture looks farther out of spec than reality- must have angled the iPad a bit!

Second question is what should I be aiming for on the timing spec?

Thanks,
Rutager

[rwest]

So I’ve been looking up numbers and I called Web Cam. Wayne’s book gives two specs for the SC cams; first is .9-1.1 the second is 1.4-1.7 and that is what Web sent me too.

Why the difference?

Thanks

[Flat6pac]

The difference was the settings for 78/79 8.5 cr and 80/83 9.3 cr
Using carrera cams and JE pistons we went to 2.0. On a 3.4 build and motronic
Why are you using CIS cams with RS pistons when S cams or Solex grinds are available?
Bruce

[rwest]

Hi Bruce,

I took the recommendation from Steve From Rennsport that the SC cams gave a better low end for the 2.7. I only street drive the car, so high RPM power isn’t as important to me.

Rutager

[Eagledriver]

The different specs were for different port sizes on the engines. In general the smaller number gives more top end power and the larger number gives more low end torque.

-Andy