Putting in a Cam. Do you need to....

[Behold81]

Replace the lifters. While the engine is apart it seems sensible to swap the cam out. But do I need to do the lifters? It's quite an added cost if not a must right now.

The engine is getting a bottom end rebuild next year and was going to do that then is sensible.

[Behold81]

Well that's the thing. I have ls6 heads to go on with new roller rockers and ls6 intake. I know a cam will help even more but coat keeps adding up. So while I don't want to cut corners if it's not needed to be replaced.

But maybe I pull a head and take a look. It's not like it's a big job to pull a head.

[Behold81]

What about springs. Take it I will need better springs to cope with the higher lift.

I believe the ls6 springs max out at .551 of lift.

[Behold81]

There is the £ 1000 question

Spec.

It's lookin like 115-116 seems best on a centri.

.6 lift on both seem common. But can I go more. Will it help?

What duration and lobe type?? This is a black art.

I'm happy to be a bit lairy. It's not a daily and it is my toy. Also emissions are easier as I'm on a no. Cat test mot.

Thoughts?

[Behold81]

No I don't have a cam yet. Want to buy one soon to fit with my heads and intake.

Appreciate. 115-116 means little without lobe size. I guess most seem to be around that angle to remove overlap.

I'm happy to be a little rough on idle as I say it's not a daily. But no need to go full lairy if it does not gain anything.

Once I have a cam size I'll get matching springs, new rods and buy my gaskets ETC.

[Behold81]

To be fair I'm running them as I have them. They should be stronger than the stock as is.

It is what it is and can always be changed later on.

But for now getting the right cam is the key to it all. I get what a cam does and how. But understanding what is best for the application is where I fall flat. Understanding what lift and duration suits best followed by what overlap or non overlap is going to net the best power and what advance is best suited is a mystery.

[Behold81]

The jam cam seems to get some good rep. Especially with the pro charger boys.

What is the spec. I can't find it.

[Behold81]

Seems like many in the vette forums are using the CCA jam cam. Many with vortech chargers. So seems a good bet.

Thanks all.

[Behold81]

fred bloggs said:

Personally id leave the cam until I do the bottom end as well. Forget this opening multiple times lark. If im going to open a motor, ill go all in.
Doing a bit at a time is not a good way of spending the monies. Building it once,properly,is.

I get that but heads are coming off anyway. So it's not much more work really. It's not like these engines are a pain to work in.

Also if I get delayed in the bottom end least this is done.