ZZ4's and what Mods
Thread Starter
Racer
Joined: May 2002
Posts: 280
Likes: 0
From: Poughkeepsie New York
ZZ4's and what Mods
Just curious to see how many C3's are running with a ZZ4. Also, what midifications have you made? I have a ZZ4 (LT$ Hotcam and 1.6 rockers) in my 79 with a 4 speed and 3.70 gears. Would like to bump up to 450+ horse if possible. What kind of 1/4 mile times can you expect with 400 to 450 horse. Thanks! 
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Originally Posted by holley505
You better add some AFR heads to get close to that 450 mark. And a more radical camshaft than the hotcam.
... 400-450 hp C3 w/ skilled driver w/ average build ... mid twelves.
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
Here's my combination ... not sure of exact horsepower.
Engine
ZZ4 with HotCam & 1.6 rockers
Home ported heads with Manley race flow valves
Manley valve springs & retainers
AFR's rev kit
650 Demon Mech. Secondaries
Driveline
5 Spd Manual Trans
3.08 stock rearend
Nitto 455 All-weather performance tires
Performance
1/4 mile =12.8 sec at 107 mph
60' time = 1.9 sec
Engine
ZZ4 with HotCam & 1.6 rockers
Home ported heads with Manley race flow valves
Manley valve springs & retainers
AFR's rev kit
650 Demon Mech. Secondaries
Driveline
5 Spd Manual Trans
3.08 stock rearend
Nitto 455 All-weather performance tires
Performance
1/4 mile =12.8 sec at 107 mph
60' time = 1.9 sec
Team Owner
Joined: Jul 2004
Posts: 40,412
Likes: 792
From: Redondo Beach, California
Originally Posted by Jason Staley
Here's my combination ... not sure of exact horsepower.
Engine
ZZ4 with HotCam & 1.6 rockers
.
5 Spd Manual Trans
3.08 stock rearend
Nitto 455 All-weather performance tires
Performance
1/4 mile =12.8 sec at 107 mph
60' time = 1.9 sec
Engine
ZZ4 with HotCam & 1.6 rockers
.
5 Spd Manual Trans
3.08 stock rearend
Nitto 455 All-weather performance tires
Performance
1/4 mile =12.8 sec at 107 mph
60' time = 1.9 sec
What year is your car? Did you use all five gears? Do you have stock exhaust?
My 68 is a convertible and will weigh a little less than 3000 pounds. I have headers on the ZZ4 and will be using initially the stock factory side pipe mufflers. i
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
Originally Posted by 68/70Vette
What year is your car? Did you use all five gears?
Do you have stock exhaust?
Do you have stock exhaust?
- No, I only use gears 1-4 shifting at 6000 rpm
- I have Dynomax headers going into 3" exhaust back to an X-pipe under the differential, then it reduces to 2.5" to enter Borla mufflers out back.
I still think there is more left in this setup with additional carb. tuning and better shifts. I'm not a very quick shifter at all - definitely my weak point. Here's a chassis dyno run I made last summer.
Thread Starter
Racer
Joined: May 2002
Posts: 280
Likes: 0
From: Poughkeepsie New York
Thanks for all the replies......looks like the AFR heads are the way to go.
How do "other" heads compare, such as Edlebrock, Bordix, etc? New at this phase, so your input is appreciated.
How do "other" heads compare, such as Edlebrock, Bordix, etc? New at this phase, so your input is appreciated.
Team Owner
Joined: Jul 2004
Posts: 40,412
Likes: 792
From: Redondo Beach, California
[QUOTE=Jason Staley]-
I still think there is more left in this setup with additional carb. tuning and better shifts. I'm not a very quick shifter at all - definitely my weak point. Here's a chassis dyno run I made last summer.
[/QUOTE
Very professional looking engineering build-up and performance!!!!
I still think there is more left in this setup with additional carb. tuning and better shifts. I'm not a very quick shifter at all - definitely my weak point. Here's a chassis dyno run I made last summer.
[/QUOTEVery professional looking engineering build-up and performance!!!!
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Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
Originally Posted by 68/70Vette
Very professional looking engineering build-up and performance!!!!
Guess my engineering background does rub off on my projects sometimes .... I'm a little bit picky when it comes to stuff looking tidy. 
Pro
Joined: Jul 2003
Posts: 649
Likes: 2
From: Red Bank NJ
top end?
Also have a 79 4spd. ZZ4, hot cam, 1.6 rollers, headers, 750 holly.
hp some where south of 400 were guessing. Stock rear. Just installed so don't have times etc yet.
Anyone out there have a quess on top end?
hp some where south of 400 were guessing. Stock rear. Just installed so don't have times etc yet.
Anyone out there have a quess on top end?
Thread Starter
Racer
Joined: May 2002
Posts: 280
Likes: 0
From: Poughkeepsie New York
GMPP Fastburn Heads
Since I have the HOTCAM and 1.6 rollers, read that I would have to change pushrods and rollers with AFR heads. Anybody using the GM Fastburn heads on ZZ4? Would that swap be worth it?
Burning Brakes
Joined: Aug 2002
Posts: 1,146
Likes: 10
From: Scottsboro Alabama
Originally Posted by L82-JWS
Since I have the HOTCAM and 1.6 rollers, read that I would have to change pushrods and rollers with AFR heads. Anybody using the GM Fastburn heads on ZZ4? Would that swap be worth it?
It's worth it! What you would have is basically a ZZ430 clone. Use a vortec air gap intake if possible. I never had mine dynoed but a friend of mine owns a 66 BB and a ZO6. He is continually always bragging to other people about how well my car runs. :o I guess that's worth something.
Thread Starter
Racer
Joined: May 2002
Posts: 280
Likes: 0
From: Poughkeepsie New York
Originally Posted by Older Than Dirt
It's worth it! What you would have is basically a ZZ430 clone. Use a vortec air gap intake if possible. I never had mine dynoed but a friend of mine owns a 66 BB and a ZO6. He is continually always bragging to other people about how well my car runs. :o I guess that's worth something.
Excellent. Thanks for the reply. Gonna do some homework, since i have already invested in the GMPP Hotcm package. With the air gap intake, do you have any hood clearance issues? I have the Moroso low profile air cleaner with 3" K&N.
Also, changing heads? Have done cam / lifter install. Any special things to know when doing a head change? Thanks.....
Last edited by L82-JWS; Jan 20, 2006 at 02:02 PM.
Burning Brakes
Joined: Aug 2002
Posts: 1,146
Likes: 10
From: Scottsboro Alabama
Nothing special about installing the heads. The gm head gaskets will give you 9.6:1 compression. If you use felpro gasket # 1010 you can bump that up to 9.7 or 9.8:1. I have an aftermarket hood so clearance isn't an issue for the air gap intake. I think some guys here are using the air gap with drop base air cleaners and clearing the stock hood. You will like this setup. 
