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-   -   CIS conversion to Weber carbs (http://forums.pelicanparts.com/911-engine-rebuilding-forum/449766-cis-conversion-weber-carbs.html)

jrairplane 01-05-2009 06:32 AM
CIS conversion to Weber carbs
 
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 01-05-2009 07:57 AM
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 01-05-2009 08:34 AM
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 01-05-2009 12:16 PM
Quote:
Originally Posted by Steve@Rennsport (Post 4398288)
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?


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