Anyone done any cam timing lately? Need help!

[ZSaint]

I have a Web Cam, grind #91. It has .450" lift. I have it in a rebuilt 3.0 block with a ported 90A head. It is running 9.0 compression. Lots of vtp clearance. The cam timing sheet states that I should run it 4` advanced. I am wondering about that setting? I called WEB and they said it was OK to retard the cam a bit to get a little more top end. I dialed it in with 2 1/2` of advance. I am thinking I need a bit more top end power because this 3.0 engine will have all kinds of low end torque. I thought I needed a bit more power at the top end.

Am I doing the right thing here? Or, should I set it at 4 1/2` (close as I can get it) advance and go with the bottom end power? It was built by an engine service company and has all of the "tricks" done to it. It will run ZTherapy SU's, electronic ignition, 3.9 L/S, 5-speed, 3-2-1 header with a 2 1/2" system.

I need somone's opinion on this cam set-up. Phred? Anyone?

[ZSaint]

No engine builders on the forum these days?

[Phred]

Loren,

Consider the lobe seperation. If its close, say around 104 to 107, it will behave more like a race cam with a stronger mid to top end. The 4 1/2 degrees Adv. will boost the bottom end and smooth out the "race cam" kick. If its above 107 it will probably be a bit more driveable, and 2 1/2 degrees Adv. will pick up the mid to top end a bit. But also think about how you will use it. How often will it see 6500+rpm? Probably not as often as it will see acceleration runs between 3000 and 6000. You might consider timing it in both ways. Take notes, then you could change it in the car if you don't like you're first setup.

Phred

[ZSaint]

I have the specs at the shop. I will bring them in tonight and see what the lobe separation is. You make an excellent point.

[Gav240z]

No engine builders on the forum these days?

Sorry ZSaint i saw your post but couldn't help I'm still learning. I'll no doubt have to make similar decisions when the time comes so let us know how you went as I'm sure i'll be referring to something similar when the time comes. :classic:

[ZSaint]

I am hoping to get the car finished next month. I have a lot of interior work to do. I am hoping to put the engine and tranny in next week. The new windshield will be put in on Monday. I am still waiting for 'blue diamond plate' interior pieces from Motorsport. I cannot finish the car without the rear shock tower vinyl. I have been waiting for 30 days for my order. It is difficult to wait for these pieces.

I will give everyone a performance check on the Z. It should be a great driver!