911sc 3.0 1979

[JLN]

Hi 👍
My 3.0 engine is out and I need new camshafts. Want a bit more performance.
964 camshafts or maybe DC13 camshafts from Dougherty Racing Camshafts would they be ok ?
Will the car still be good to drive as my daily car in the summer ? 😊

[Dpmulvan]

Originally Posted by JLN

Hi 👍
My 3.0 engine is out and I need new camshafts. Want a bit more performance.
964 camshafts or maybe DC13 camshafts from Dougherty Racing Camshafts would they be ok ?
Will the car still be good to drive as my daily car in the summer ? 😊

Depends, are you keeping motor stock?

[Henry Schmidt]

Originally Posted by JLN

Hi 👍
My 3.0 engine is out and I need new camshafts. Want a bit more performance.
964 camshafts or maybe DC13 camshafts from Dougherty Racing Camshafts would they be ok ?
Will the car still be good to drive as my daily car in the summer ? 😊

Back in the mid 70s Harry Weber took a clean sheet of paper and designed a camshaft that was perfectly suited to the Porsche CIS engine. What he came up with was the 20/21. I haven't found a better camshaft for the stock CIS engine yet.
I this John calls his version the DC19 or DC21?.

[JLN]

Originally Posted by Dpmulvan

Depends, are you keeping motor stock?

The rest of my engine seems to be ok. But I need new camshafts 👍

[zztot]

My understanding is you should at least recondition rockers not a tech but I stayed at Holiday inn express.
Henry does those exchange…..l

[mepstein]

It’s always ok until you open it up - lol.

[PeteKz]

I haven’t used the 20/21 cam that Henry references. I do use the Knight Racing M1 cam with CIS. I know from my own measurements and testing that the M1 cam uses as much lift and duration as possible without the valve contacting the pistons. The CIS/Carrera pistons limit lift and duration, so I’m nearly certain that the 20/21 numbers are very close to the M1 numbers.

If you plan to keep your current pistons, call William Knight and talk to him about the M1. 615-969-4917. If you change your pistons to ones with valve cutouts, you can choose a “hotter” cam.

[JLN]

Originally Posted by zztot

My understanding is you should at least recondition rockers not a tech but I stayed at Holiday inn express.
Henry does those exchange…..l

I live in Norway 👍 What do you mean by "Henry does those exchange"

[porschedude996]

Originally Posted by JLN

I live in Norway 👍 What do you mean by "Henry does those exchange"

It means that he would have a set to send to you already reconditioned and he would take your old rockers and refurbish them for his next customer.

[JLN]

Originally Posted by porschedude996

it means that he would have a set to send to you already reconditioned and he would take your old rockers and refurbish them for his next customer.

👍😊