Difference between zz3 and zz4 heads
Thread Starter
Joined: Jul 2001
Posts: 952
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From: La Porte, IN
Car: 1987 Monte Carlo SS
Engine: L98
Transmission: 200-4R
Axle/Gears: 7.625 10 bolt/3.73s
Difference between zz3 and zz4 heads
I just wanted to know the difference between assembled zz3 and zz4 heads. Also, will the zz3 head take the springs from the LT4 hotcam kit without machine work? Thanks
Supreme Member
Joined: Oct 2001
Posts: 1,392
Likes: 4
From: orlando, fl usa
Car: 1986 pontiac TA
Engine: 360 HSR
Transmission: 700r4 3300 yank converter
Axle/Gears: 3.27 9 bolt
they switched from the gm high performance (orange) springs to the lt4 springs. the lt4 springs are 1.32" diameter. i'm not sure if you will need to open the pockets or not.
Thread Starter
Joined: Jul 2001
Posts: 952
Likes: 0
From: La Porte, IN
Car: 1987 Monte Carlo SS
Engine: L98
Transmission: 200-4R
Axle/Gears: 7.625 10 bolt/3.73s
You would think they would change the cast if they needed a bigger spot for the springs but you never know. I'll keep looking. Thanks
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evilstuie
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Jan 9, 2020 08:29 PM
