Cam
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Member
Joined: Dec 2000
Posts: 335
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From: Glen Burnie, MD USA
Car: 1989 IROC
Engine: 350
Transmission: T56
Cam
I am rebuilding an 89 IROC and wanted some advice on the cam that I should get. I am going to use AFR 190s and was thinking about getting a ZZ9 cam. any advice would be helpful.
Supreme Member
Joined: Feb 2000
Posts: 1,196
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From: Fort Collins, Colorado
The LT4 HOT Cam is better than the ZZ9 and it MUCH less expensive. $160 as opposed to $400. If you get the ZZ9, you also may have to replace your springs and retainers, another $150+. The LT4 HOT Cam specs are Duration @ .050 218*/228* with .492"/.492" lift.
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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End
Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.
Best ET : 14.32 @ 97.7mph
(corrected for elevation)
Next on the list: LT4 HOT Cam
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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End
Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.
Best ET : 14.32 @ 97.7mph
(corrected for elevation)
Next on the list: LT4 HOT Cam
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
You'll need new springs with the LT4 HOT cam too, as the stock ones are good for .480" lift. The ZZ4 cam is another good choice, I had one in my car.
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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
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From: ILL
Car: 1986 Pontiac TA
Engine: 383
Transmission: 700R4
Axle/Gears: 3.70
You should not need to worry about springs if you have the AFR heads. The springs that come with the heads should handle either cam.
OF the two,I have to say that the Hot Cam would be a better choice. The guys on the corvetteforum.com really slammed the TPIS cams. Supposedly they are groung out of spec. You might want to check into it. I like the CompCam Extreme Energy line. They have aggressive lobes without being radical and still maintain good idle characteristics.
Something along the line of a 218/224 ground on a 112lsa.
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D&Z Performance
"Putting Power to the Pavement"
OF the two,I have to say that the Hot Cam would be a better choice. The guys on the corvetteforum.com really slammed the TPIS cams. Supposedly they are groung out of spec. You might want to check into it. I like the CompCam Extreme Energy line. They have aggressive lobes without being radical and still maintain good idle characteristics.
Something along the line of a 218/224 ground on a 112lsa.
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D&Z Performance
"Putting Power to the Pavement"
Supreme Member
Joined: Feb 2000
Posts: 1,196
Likes: 0
From: Fort Collins, Colorado
The stock springs are good to .500" lift.
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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End
Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, LT4 HOT Cam, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.
Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)
------------------
1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End
Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, LT4 HOT Cam, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.
Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)
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