new valve springs?
Thread Starter
Senior Member
Joined: Apr 2002
Posts: 514
Likes: 0
From: Deer Park, N.Y.
Car: 1983 z-28/SFC/bilsteins/adj.arms
Engine: 355sbc/Demon650dp/hedmanheaders/
Transmission: t-5, alum DS
Axle/Gears: 3.42 torsen posi, baer discs
new valve springs?
if i switch to 1.6 rockers on a vette 113 head, will i need stronger springs? what determines this? i'm running a zz4 cam...
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The coil bind height of the spring is one factor. Available valve travel (clearance between the spring retainer and top of the valve guide/seal) is the other consideration.
With a ZZ4 cam, 1.6:1 rockers will give you .544" travel on the exhaust. You need springs that have at least that much difference between the installed height and coil bind, plus about .060" for safety. Ditto for the valves - you need at least .604" valve travel.
With a ZZ4 cam, 1.6:1 rockers will give you .544" travel on the exhaust. You need springs that have at least that much difference between the installed height and coil bind, plus about .060" for safety. Ditto for the valves - you need at least .604" valve travel.
Thread
Thread Starter
Forum
Replies
Last Post