hey all, i was wondering how many valves per cylinder the crate ZZ4 has. i have read a few webpages on turbo/supercharging an engine, and they all said the more valves per cylinder the better!

any suggestions, or information about the ZZ4, or other sweet engine packages?

 

all SBC engines have 2 valves per cylinder.

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-=ICON MOTORSPORTS=-
1st & 3rd

 

that sucks. only 2? who sells a diffrent setup which has say 4 valves per cylinder? all small block chevys don't ever have more then 2?

ug.

 

the olds quad 4 comes to mind for a gm product.

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-=ICON MOTORSPORTS=-
1st & 3rd

 

ZR1 Vette?

 

the LT4 and the Caddy Northstar are the only engines I know with 4 valves per cylinder. And the LT4 was only availavle on the 96 Limited Edition Corvette.

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1983 Pontiac Firebird SE
LG4-Based Chevy 400
700R4 Tansmission
Modified 4 Barrel Q-Jet Carb
Accel Super Stock 8mm Wires
Edelbrock Pro-Flo Air Cleaner
3.23 Posi Rear
14X7" Cragar SS/T Wheels
35X4 CD/AM/FM Head Unit
100WX2 Amp
2 Pioneer 12" Subs in Custom Box
Third Gen Performance
"A four cylinder is only half an engine"

 

Uhm... The LT4 has two valves per cylinder too. Are you thinking of the LT5, the ZR1 engine?

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

yeah probably - i know it was the special ed. one in the 96 vette, but I thought i was lt4.

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1983 Pontiac Firebird SE
LG4-Based Chevy 400
700R4 Tansmission
Modified 4 Barrel Q-Jet Carb
Accel Super Stock 8mm Wires
Edelbrock Pro-Flo Air Cleaner
3.23 Posi Rear
14X7" Cragar SS/T Wheels
35X4 CD/AM/FM Head Unit
100WX2 Amp
2 Pioneer 12" Subs in Custom Box
Third Gen Performance
"A four cylinder is only half an engine"

 

For those who are seriously encumbered with an excess of ready cash, there was a set of aftermarket heads available for V8s with four valves per cylinder. I think they were called "Dominion" heads or something like that... I could be wrong (correction: I'm most likely wrong, but maybe I'm at least close on the name).

 

The money spent on a multivalve SBC could be spend on other 'go-fast' parts and end up with more power.
twin dual cam 3.4L has 4 per cylinder


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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro

 

the lt5 engine was develope in conjuction with lotus, and it almost bankrupt GM.
chevy out gmpowertrain.com for all the gm engine line up.
a ls6 vette will run faster than a lt5 vette, and it do it with 2 valve per cylinder.
the audi engine have 5 valve per cylinder.
so their 1.8T liter engine have 20 valve that is 4 more than our beloved v8. it is a great little engine, with just a chip you can raise hp from stock 150 to 200 safely.
the audi tt use the same engine but put out 220 hp with bigger intercooler.

my point is, i don't have a point so i will just stop now...

dw

 

The LT4 was in the 96 Corvette, but it was just an LT1 with a cam/heads/intake package. The LT5 was in the 90-95 ZR1 Corvette.

 

...and I always thought that Kiekhaffer/Mercury Marine in Fond du Lac helped develop and built ALL LT5 engines for Chevrolet. I know that Lotus is owned by GM, so I guess you could say they conspired on the basic design, but Merc did the final engineering, design, and build.

Incidentally, the most powerful gasoline internal combustion engines have only two valves per cylinder, unless you call 2,500 HP at the crank "low-power".

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

some info on the famous lt5 engine
which is a 10k option(zr1) for the vette. http://www.zr1.net/LT5tech.html

dw

 

Vader,

Isn't it interesting that good 'ol Smokey Yunick agrees?

The Smokemeister granted an interview with one of the Hotrod rags a few years back, and multiple valves per cylinder was one of the topics.

Here is the condensed version of Smokes' comments -

He said MV heads are "horse****". Why? Because they only provide additional flow at high RPM - because of increased valve area - but that they actually KILL low-RPM performance because of turbulance. Smoke went on to say that in a high-RPM 4-cylinder that's okay, but that in a SBC it's stupid.

Smoke says that we should use the largest single intake and exhaust valve we can fit in the head. He has a mountain of flow data on 2 vs. 4 valve heads. One thing - Smoke did this interview BEFORE VVT - a little Honda Motors trick that may have turned the tide in favor of wilder cams and 4 valve engines.

And, D_Amlee.........

Those ARE Dominion heads, and they ARE $3,200. Well beyond what the average SBC builder will spend. The dyno test I saw...and it's been awhile, showed about 50 HP extra, mostly at high RPM with the Dominion heads.

Uh, but they were tested against stock GM units.

I'd choose the AFR 195cc street head over them, and use the $2,000 I saved for a 12psi ATI supercharger with intercooler, and a leeeeeeetle shot of nitrous ........just to keep things cool.

How 'bout dem fancy 4-valve heads now????

I got your 4-valve heads...right here.

100% Columbian bean ala Juan Valdez today - it's the reeechest kind.

BOR

 

Dwang, I have seen road tests for the early LT5s and they were turning in low 12s. I beleive it was an 89. Maybe they meant 1990 because I haven't seen an 89 ZR1 before.

The LS6 turns in 12.7s from what i have seen so far.

The 97 cobras (and maybe newer) have 4 valves per cylinder and DOHC cams and they still barely break into the high 13s. haha. When are they going to get it right.

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92 Formula
305 TPI 5speed
1LE package
Mods: SLP headers,SLP catback,SLP air foil,ported plenum,K&N, Crane AFPR (47psi),MSD6AL, MSD wires, AC DELCO cap/rotor/plugs, Bosch O2sensor, 3:73s,JET fan switch, Macewen white face gauges, Intellitronix Digital Gauges

[This message has been edited by theformula (edited December 05, 2000).]

 

hopefully never

 

Maybe when they use Gm parts lol

------------------
1983 Pontiac Firebird SE
LG4-Based Chevy 400
700R4 Tansmission
Modified 4 Barrel Q-Jet Carb
Accel Super Stock 8mm Wires
Edelbrock Pro-Flo Air Cleaner
3.23 Posi Rear
14X7" Cragar SS/T Wheels
35X4 CD/AM/FM Head Unit
100WX2 Amp
2 Pioneer 12" Subs in Custom Box
Third Gen Performance
"A four cylinder is only half an engine"