Cam upgrade for ZZ383.... need input - Team Camaro Tech
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post #1 of 4 (permalink) Old Mar 5th, 10, 06:36 PM Thread Starter
Gold Lifetime Member
Join Date: Jun 2006
Location: Vacaville CA
Posts: 1,322
Cam upgrade for ZZ383.... need input

It's been 3 years now since installing a GMPP ZZ383 in my '69. I'm thinking about changing the cam to get rougher idle. The stock cam pulls a very steady 18 inches of vac, at idle. I'm looking for suggestions for a cam that would not lose me low end torque but get the idle I'm looking for.

I topped off this crate motor with the following parts:

Edelbrock Air-Gap vortec intake
MSD 8360 Distributor
Holley 650cfm vac, sec. carb #80783-1 (also have similar 750)
D368 headers
M22W 2.54 first gear
ProComp 1.6 roller tip rockers(still have 1.5 GM rollers)


Known to run with scissors....
1969 Camaro Z/28 "clone", GMPP ZZ383, Autogear M22W, Moser 12bolt w/TruTrac 3:73.
Fred Mertz is offline  
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post #2 of 4 (permalink) Old Mar 5th, 10, 07:04 PM
Senior Tech
Join Date: Mar 2003
Location: fairfield, Ca
Posts: 175
Re: Cam upgrade for ZZ383.... need input

Hey Fred, If you ever heard my car(red 67 camaro) at any of the vacaville shows, it has a zz4. I used a xr276hr quite a bit lumpier than the 268.

67RS-zz4 w/ trickflow heads 276hr cam air gap 780 Pro Systems TexRacing 4spd AGR steering SCAT procars 12 bolt eaton posi 3.73's SSBC all around, TT2's Dakota Digital Painless DSE hinges

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post #3 of 4 (permalink) Old Mar 5th, 10, 07:07 PM
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Join Date: Mar 2009
Location: Lyman, SC
Posts: 8,348
Re: Cam upgrade for ZZ383.... need input

When I had my 383 originally quoted (which has since grown into a Dart 400 thanks to my tax refund), my builder selected the cam with me after going round and round on what I wanted. 100% street driven and wanted gobs of midrange since I'm running a 3.42 and five speed OD trans.

He came up with the Comp Cams XR276HR (hydraulic roller) but ground with 224/224 on 108 lsa (normally it's 224/230 on 110 lsa) along with 1.6 rockers to get the lift up some. If you're running Vortec heads you might want to keep the extra exhaust duration. Mine was going to have AFR-195's. He said that would give me what I wanted and still pull around 14" at idle and we were going to keep compression ratio around 10:1.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #4 of 4 (permalink) Old Mar 5th, 10, 07:11 PM
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Michael Gekko
Join Date: Mar 2006
Location: Wrightsville Beach, NC
Posts: 5,583
Re: Cam upgrade for ZZ383.... need input

Whenever you start increasing duration to get a rougher idle it is very likely low RPM torque is going to suffer a bit. You could circumvent that compromise by utilizing a looser torque converter, or in your case slipping the clutch a little more or even going to a different clutch set up, and using a lower gear.

1968 Camaro NHRA/IHRA SS/C 'Super Stocker' 396/Jerico
1968 Street/Strip Camaro 350 w/PG
1968 Caprice NHRA/IHRA Stock ELiminator O/SA 327-250 HP

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