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Old 09-15-2010, 12:36 PM
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What rocker to use for zz383 cam

Ok guys i was given a zz383 cam by a friend and have decided to use it in my 383. 72 c10 swb 200r4 3.73:1

383 zero decked
16 cc dished pistons
dart 200cc heads 64 cc
.041 gasket
rpm air gap
670 vac sec avenger
hei
should be about 9.8:1 scr


i initially decided to use a 276h which is 224/230 @ .050
but since I was given the zz383 cam which is 222/230 .509/ .528 lift I have decided to use it. my question is since I am having to buy rockers anyway should I go ahead and get 1.6 rockers.

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Old 09-15-2010, 02:55 PM
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If it were mine, I'd get a split set, 1.6 for the intakes and 1.5 for the exhaust.
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Old 09-15-2010, 03:58 PM
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Quote:
Originally Posted by popo1984
Ok guys i was given a zz383 cam by a friend and have decided to use it in my 383. 72 c10 swb 200r4 3.73:1

383 zero decked
16 cc dished pistons
dart 200cc heads 64 cc
.041 gasket
rpm air gap
670 vac sec avenger
hei
should be about 9.8:1 scr


i initially decided to use a 276h which is 224/230 @ .050
but since I was given the zz383 cam which is 222/230 .509/ .528 lift I have decided to use it. my question is since I am having to buy rockers anyway should I go ahead and get 1.6 rockers.
Crane grinds this EXACT same cam under part number 119831. 2000-6200 power range, good mid-range torque and hp, fair idle, moderate performance useage, mild bracket racing, auto trans with 2500+ converter, 9.5 to 10.75:1 static compression ratio advised. Timing events 4/38/52/-2

1.6 on the intake will yield 0.543" lift, 1.6 on the exhaust will yield 0.563" lift. Make sure you have enough valve spring. Check for piston to valve clearance, retainer to guide clearance and check the springs for stacking solid at that lift. Also, if you use conventional (non-roller trunnion) rockers, inspect the relationship between the rocker slot and the rocker stud at full lift. They make long-slot rockers to cure interference problems.

On the DynoSim combos that I play with, 1.6 rockers will usually add less than 10 hp, while significantly increasing the stress on the valvetrain.

That cam will make some pretty good cylinder pressure with those heads and intake, so make sure you have the squish tightened up (0.035" to 0.045").

Last edited by techinspector1; 09-15-2010 at 04:09 PM.
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Old 09-15-2010, 05:12 PM
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Hey Tech I was hoping you would see this thread. We last spoke of my build when I was thinking of the 276H. Well my buddy gave me this cam which he pulled from a brand new zz383 for a customer. I am now thinking of using it to save some cash since I just finished the short block and am now looking to get a cam.

Im thinking this zz cam will be a little less aggressive and more streetable. I could always add a little spray down the road if I want more at the track. My bottom end is forged so it can take it.

I came up with 8.4 dcr which is right on the limit for pump gas I think. What are you guys thoughts on that. Did I calculate that right?

Last edited by popo1984; 09-15-2010 at 05:16 PM. Reason: spelling
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Old 09-15-2010, 07:16 PM
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Quote:
Originally Posted by popo1984
Hey Tech I was hoping you would see this thread. We last spoke of my build when I was thinking of the 276H. Well my buddy gave me this cam which he pulled from a brand new zz383 for a customer. I am now thinking of using it to save some cash since I just finished the short block and am now looking to get a cam.

Im thinking this zz cam will be a little less aggressive and more streetable. I could always add a little spray down the road if I want more at the track. My bottom end is forged so it can take it.

I came up with 8.4 dcr which is right on the limit for pump gas I think. What are you guys thoughts on that. Did I calculate that right?
I get 8.518:1 DCR, using 38 +15 for the intake closing point, 9.8:1 SCR, 5.703 rod and 3.750" stroke. Tighten up the squish.
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Old 09-15-2010, 08:15 PM
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actually the rods are 6.0 and the block is zero decked. I will be using the felpro 1003.
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Old 09-15-2010, 08:21 PM
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Quote:
Originally Posted by popo1984
actually the rods are 6.0 and the block is zero decked. I will be using the felpro 1003.
OK, 8.494:1
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