Difference Between ZZ4And ZZ5?
Thread Starter
Drifting
Joined: Feb 2007
Posts: 1,498
Likes: 206
From: Pearland Texas
St. Jude Donor '09
Difference Between ZZ4And ZZ5?
Whats the difference between these two. the ZZ4 and ZZ5? Does anyone know if the heads will work with my Hooker sidepipe system? I have notice that Gm performance doesnt advertise the zz4. Is it discontinued? any info will be appreciated .
Le Mans Master
Joined: Jan 2000
Posts: 8,720
Likes: 106
From: Canada
ZZ4 is discontined, ZZ5 essentially the same other than beehive valve springs and using the fastburn heads. The hp is up 45 as well but tq is relatively unchanged.
Last edited by gdh; May 25, 2014 at 11:12 AM.
