USMCBeck

Well I am planning on swapping out my heads for vortec heads. I have a roller sbc 355. Right now it has a GM ZZ2 cam the lift is 480, and I was wondering if anyone used this cam with vortec heads #906 and if I would be better off swapping the cam as well?

Any comments would be much appreciated.

My goal is to make around 400-450 Hp at the flywheel eventually.

I already have the heads and a vortec intake.

conlinj

iTrader: (3)

are the heads stock? or will you have them clearanced for higher lift cams?

USMCBeck

Stock right now, But I could have them machined. Or use a thicker gasket?
I'm just curious how well the ZZ Cam would work on the Vortec heads. If I swap the cam, I'm unsure what I would go to.

conlinj

iTrader: (3)

what are the rest of the specs on the cam? .450+/- is around the max lift for stock vortec heads. You would really have to check your clearances to run the zz2 cam you have now. The safest bet is to have them machined for higher lift and go from there. Stock vortecs only flow well to @500 lift. I wouldn't recommend running a cam with a lift higher than .550 with the vortecs unless you plan on going with better heads in the long run.

USMCBeck

The duration at lash point in degrees (intake/exhaust) is 336/336; duration at .050" tappet lift (intake/exhaust) is 235/235; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 480/480. Valve lash is zero/zero and lobe centerline is 114 degrees.

conlinj

iTrader: (3)

Not a bad cam, wouldn't be worth the swap to anything with similar specs. You can try it with the heads in stock form and go over the clearances, odds are you will have to have them machined though. After they are machined you could consider swapping to a cam with more lift and a lower centerline. Another option would be to keep the cam and go with 1.6 rockers. That would bring you to .512 lift

USMCBeck

1.6 self aligning roller rocks would require screw in studs right? So If I used 1.6 rockers how would that help me compared to 1.5s? Would it just help with clearance issues?

conlinj

iTrader: (3)

1.6 rockers effectively make your cam larger than it is, it would make the clearance issues worse if you don't have the heads machined.

USMCBeck

Well I guess Depending on clearance, My best would be to machine them and get 1.6 rockers then, because i need rockers that are self aligning anyways. Thanks for the info.

USMCBeck

What springs would be good for my heads, because I'm guessing the stock ones might cause my valves to float.

conlinj

iTrader: (3)

talk to the machine shop that will be doing the heads, they should be able to give you advice on the springs