Abe91Z28

I'm just curious, And i mean by a 350 designed by GM

Jim85IROC

iTrader: (2)

In terms of a production unit, I would definately say the Z06, although that's technically a 346, not a 350. Some of the old 350s might have been rated at or higher than that, but that's back when horsepower was rated differently.

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

Jason E

Well, ignoring 350s for a sec, the 347 inch Corvette ZR-1 was actually rated higher than the Z06, at 405hp. Now, this isn't considered to be a typical Chevy small block, but then again others feel the same way about the new-generation 346 LS1s.

The highest rated 350 ever would be a close tie (I guess) between the 285hp net rated '96-'97 LT1s, or the 360hp gross rated '70 Z28 350. Its hard to say which one should be considered more powerful.

------------------
Jason E
'89 Camaro RS 2.8
Medium Grey Metallic/AT/T-tops/all power
Hypertech chip/2 K&N filters/Modded air box
Eclipse CD/Eclipse 100x4 amp/Boston4x6 plates, 6x9 RX 3 ways/ALL Monster's goodies
Alpine Alarm w/ Keyless entry
IROC tailights/t-windows

MRZ28HO

Ok, first of all the ZO6 is a suspension code, not an engine code. So the ZO6 can't be the highest HP engine, becuase it's not an engine. The ZO6 comes with the higher HP LS1 (which is the highest HP SBGM 5.7L). Now, Jason, I think you forgot the LT4, that would be higher.

[This message has been edited by MRZ28HO (edited September 29, 2000).]

Grim Reaper

I will second the LT-4 as the highest HP 1st Gen SBC. Though the LT-1 was rated higher in 1970, it used the more optimistic Gross rating.

The LT-5 was the highest (found in the ZR-1) but I do not consider a Chevy engine, it was actually built by Mercury Marine.

And the current highest rated Gen III is the LS-6.

Kevin91Z

iTrader: (1)

What about the ZZ430? Or are we talking engines that were actually put into cars from the factory?

The ZO6 engine is called the LS6.

------------------
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=-

MRZ28HO

That's it, LS6, I keep thinking BBC when I hear that (and LT1/LT-1). Kev, I think he meant in a production vehicle application, otherwise you could be right.

Grim Reaper

As a crate motor, the ZZ430 would DEFINITELY be a major contender.. but remember.. it rated Gross too (or so I have been told).

That is why a ZZ4 (rated 355 Gross) is not upto snuff with the LT-4 (rate 340 Net)...

I will check with one of my guru's but I have always been under the impression the crate motors are rated under the Gross BHP system (like the good old days) where as the engines installed in vehicles since 1972 (or 1971) were rated under the Net System.. which is about 20% less that Gross...

Also, there is even talks about inconsistencies with the Net System... Some are asking for the system to be based on an average of a certain number of engines off the line... instead a possibly "prepped" engine that is not representative of what the "average" engine is like when it comes off the production line.

No matter how you look at it.. the HP rating system is STILL subject manipulation.

Kevin91Z

iTrader: (1)

Which is how F*rd came up with a 320 HP 99 Cobra that puts only 225 HP to the rear wheels.

88IROCs

The funniest thing about the whole Cobra intake debacle was when Road & Track compared a '98 Cobra with a supposed 320 hp(actually had about 270) against a '98 Camaro SS with a supposed 320 hp(actually about 345). Despite the fact that Cobra was 100 lbs heavier(thier stat), had a taller rear gear and was down approx. 75 hp to the SS, the 0 - 60, and 1/4 mi. ET and MPH were nearly identical for these two cars. Makes you wonder how much Ford paid R&T to come up with a favourable results? If you had any faith in the accuracy of R&T's reporting, that article shredded thier credibility all to hell.

------------------
He who hesitates,... is lost!

Jason E

I would NEVER trust Toad and Crack for anything!!! Textbook case why right here:

'83 L69 Z28 Road and Track road test:
0-60: 8.1 sec

Motor Trend: 6.7 sec

Car and Driver: 6.8 sec

And the trend goes on through today. I don't know WHAT these guys do differently, but they normally have the slowest road test stats of any magazine. And its been that way for 20 years!!!!!

------------------
Jason E
'89 Camaro RS 2.8
Grey/AT/T-tops/all power
Hypertech chip/2 K&N filters/Accel cap/rotor/8.8 wires
Eclipse CD and 100x4 amp/Boston 746 4x6 plates and RX 6x9 3 ways/ALL Monster's goodies
Alpine Alarm w/ Keyless entry
IROC tailights/t-windows

vortecfcar

the ZZ430 makes all of the 430 horsepower it advertises. As long as you run headers and the other recccomended hardware. This engine IS the strongest small block chevrolet has ever made commercially available built.

------------------
91 RS W/carbed 350, Vortec heads, performer rpm, Comp cams Xtreme energy 280 grind. BFG Drag radials. 3.42 posi,Corvette servoed 700r4, ****ty stock converter
13.24@104