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Old 11-14-2010, 05:44 PM
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Question on SBC zz4 roller cam

Hello guys I am getting ready to tear my engine out this week and I am getting some cylinder head work done and while its out I decided to take out my mild voodoo 212/218 @ 50 510/510 112 LSA and replace it with my gm zz4 roller cam 208/221 @ 50 with 474/510 lift.

Reason I am doing so is because the fast ramp rate of the voodoo cam will reck havoc on my valve train in the long run and since this is a daily driver I want my stuff to last longer and decided to go with the zz4 which according to techinspector's dyno simulator will actually make more power.

That voodoo cam really made a lot of racket on the opening and closing of my valves and made my engine sound like a diesel lol.

The question I have is most after market cams have 4 degrees advanced made into the cam at the straight up position and has anyone out there used a zz4 roller cam and does it have 4 degrees advance made into the cam or will I have advance it 4 degrees then if I want to do so?

Also tech inspector ( or anyone else who really knows there cams) if you read this since you know your stuff really well wold it make that much a difference on the bottom end or not?

Engine spec:
350 9:1 compression flat top pistons. OEM roller setup
World product sportsman 2's which will be getting a competition valve job
done and will be bowl blended for more flow.
Edelbrock EPS intake dual plain
Holley 670 street avenger carb

Thanks guys
Eric

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Last edited by eric32; 11-14-2010 at 05:50 PM.
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Old 11-14-2010, 10:35 PM
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Hi Eric,
I'll DynoSim it for you if you can provide the centerlines and also head flow info. Thanks.
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Old 11-15-2010, 07:35 PM
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Hello techinspector the gmzz4 cam has a 112 intake and 112 exhaust with a 112 LSA as that is all I could find. As far as my world heads go all I know is what the original flow number are for the world product sportsman 2's.

What they will flow after the valve job along with the bowl blend job I will have no idea. I am just having them done. Can you just run your dynosim with out the soon to be better flow numbers just so I can have a estimate.

Anyways I was just wondering would it be better to advance the cam 4 degrees or leave it straight up. I have searched and could not find out but one person posted some specs on the zz4 cam and it seems it is 112 on the intake and exhaust and does not have 4 degrees advance grinded into it.
Eric
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Old 11-19-2010, 01:53 PM
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Hello techinspector I don't have the actual flow numbers but these are the advertised ones from world out of the box. These are the sportsman 2's with 72cc chambers. flow numbers are below but mine should flow more give or take some cause I am getting my heads redone with a competition valve job with a bowl blend port work on them. Anyways can you run the difference with the cam at straight up and with 4 degrees advanced. The zz4 roller cam has 112 intake and 112 lobe seperation angle on it with 275/280 474/510 lift 208/221@ 50.

I know your busy and it may take you a while to respond so no biggy.
Thanks again Eric
I E
050 40,28
100 68,57
200 132,102
300 187,131
400 225,150
500 240,164
600 243,160
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