ZZ4 Cam
3rd Gen Tech Moderator
Joined: Jun 1999
Posts: 780
From: Orange County, CA
Yep, I did. Its 208/221 duration at .050". It made 282 RWHP and 380 RWTQ in my engine. I had a stock port-matched TPI intake and runners, SLP 1 5/8" headers, port-matched L98 heads, and a flowmaster 3" exhaust.
Just remember it wont work with stock heads. They'll need machine work and new springs to accept the higher lift.
Just remember it wont work with stock heads. They'll need machine work and new springs to accept the higher lift.
Registered User
Joined: Apr 1999
Posts: 86
From: Fort Wayne, Indiana
I think GMHTP did a test with this cam on a dyno with a stock engine compared to the stock L98 and HOT LT4. The ZZ4 only produced 4hp and 8ft-lbs or so more across the board than the stock L98 at the flywheel. Again this was on a stock engine. Obviously, more mods will increase its effectiveness.
In my opinion, I would not spend full purchase price for the ZZ4 when there are so many better grinds out there. I am a firm believer in the HOT LT4 cam but you will need springs and head work for the increased lift like with the ZZ4. The HOT LT4 has good street manners as well but you will need a chip done if you are running speed density. MAF systems are more compatible but timing will be an issue.
I just did a 87 IROC that now has a '96 5.7L Vortec engine with ported exhaust on the heads, SD TPI lower, SLP siamese runners, ported upper, 1.52 roller tip rockers, and a hotcam, headers, exhaust, etc. Definately a mid to upper 13-sec car on the stock 3.23 gears (if it would hook up). Pulls strong from 2800 to about 5800 RPM.
You can run a stock stall converter with this setup because the LTR setup still supplies enough low end grunt to pull the car away from the light. However, you will loose some low end over the stock or ZZ4 cam, but above 3000 rpm, the HOTLT4 will leave the others in the dust.
A bigger stall will help, I would stick to about a 2200 rpm or so will stall to about 2400 on this setup because of the torque. GM makes a stock converter that stalls at about 2200 RPM that is used in the 4.3L CPI blazers.
Just my 2 cents.
In my opinion, I would not spend full purchase price for the ZZ4 when there are so many better grinds out there. I am a firm believer in the HOT LT4 cam but you will need springs and head work for the increased lift like with the ZZ4. The HOT LT4 has good street manners as well but you will need a chip done if you are running speed density. MAF systems are more compatible but timing will be an issue.
I just did a 87 IROC that now has a '96 5.7L Vortec engine with ported exhaust on the heads, SD TPI lower, SLP siamese runners, ported upper, 1.52 roller tip rockers, and a hotcam, headers, exhaust, etc. Definately a mid to upper 13-sec car on the stock 3.23 gears (if it would hook up). Pulls strong from 2800 to about 5800 RPM.
You can run a stock stall converter with this setup because the LTR setup still supplies enough low end grunt to pull the car away from the light. However, you will loose some low end over the stock or ZZ4 cam, but above 3000 rpm, the HOTLT4 will leave the others in the dust.
A bigger stall will help, I would stick to about a 2200 rpm or so will stall to about 2400 on this setup because of the torque. GM makes a stock converter that stalls at about 2200 RPM that is used in the 4.3L CPI blazers.
Just my 2 cents.
Thread Starter
Registered User
Joined: Dec 2001
Posts: 6
From: chapel hill, NC, USA
It only cost me a hundred bucks, i'm going to port and polish the intake and gasket match all of it when its apart. I'm also going to siamize the runners. What machine work do I need to have performed?
Ran 233rwhp and 340rwtq with mods listed minus gears and converter (i don't know if the gears would affect rwtq at all]
Ran 233rwhp and 340rwtq with mods listed minus gears and converter (i don't know if the gears would affect rwtq at all]
3rd Gen Tech Moderator
Joined: Jun 1999
Posts: 780
From: Orange County, CA
Originally posted by Joey91Formula350
It only cost me a hundred bucks, i'm going to port and polish the intake and gasket match all of it when its apart. I'm also going to siamize the runners. What machine work do I need to have performed?
Ran 233rwhp and 340rwtq with mods listed minus gears and converter (i don't know if the gears would affect rwtq at all]
It only cost me a hundred bucks, i'm going to port and polish the intake and gasket match all of it when its apart. I'm also going to siamize the runners. What machine work do I need to have performed?
Ran 233rwhp and 340rwtq with mods listed minus gears and converter (i don't know if the gears would affect rwtq at all]
The heads need new springs for sure, which might mean having the spring pockets enlarged. And the valve seals need to be changed.
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