CIS conversion to Weber carbs

[jrairplane]

I have a 74 911S with CIS and want to swap to Weber carbs. I understand this change is pretty worthless unless you also change camshafts. Can anybody tell me which camshafts to use that won't require me to change pistons?

[Steve@Rennsport]

IMHO, you don't need to change cams, but it does help a bit.

You can use either early "T" cams or a 964 profile (ground on 3-bearing ones).

[Henry Schmidt]

Steve is correct. If you don't modify the pistons (IE: change or add valve pockets) your cam choices are very limited.

If you can modified the pistons, I would recommend Solex cams for all around fun street driving.

[safe]

Originally Posted by Steve@Rennsport

IMHO, you don't need to change cams, but it does help a bit.

You can use either early "T" cams or a 964 profile (ground on 3-bearing ones).

Would a T cam add any HP over a CIS cam? How does it compare to the 964 grind?