ZZ4 spring max lift ?
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Joined: Aug 2001
Posts: 246
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ZZ4 spring max lift ?
I want to install a bigger cam in my engine. I need to know how much lift the ZZ4 springs can handle ? They handle at least .510 but can they go more safely ? Anybody know ? Thanx
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1991 Z28 5.7 TPI
ZZ4 heads, ZZ4 cam, Harland Sharp roller rockers, Accel base, SLP siamesed runners, 52MM SLP Throttle Body, Hooker Headers, Flowmaster catback, MSD6A ignition, Home made ramair system, aluminum driveshaft, WC 5-speed etc
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1991 Z28 5.7 TPI
ZZ4 heads, ZZ4 cam, Harland Sharp roller rockers, Accel base, SLP siamesed runners, 52MM SLP Throttle Body, Hooker Headers, Flowmaster catback, MSD6A ignition, Home made ramair system, aluminum driveshaft, WC 5-speed etc
Joined: Jul 1999
Posts: 10,950
Likes: 27
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Change the springs. GM uses them with the LT4 HOT cam kit at .525" lift, but I certainly wouldnt after measuring them. They dont have enough seat pressure and they're too close to coil bind at that lift. I went with Manley 1.25" race springs. Do a search for a post by my dad, Dyno Don, on the TPI board regarding springs for the Vortec heads. Thats what we used.
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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH (2.10 60')
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-
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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH (2.10 60')
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-
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