Actual ZL-1 Horsepower.
 

Does anyone know the actual HP that the ZL-1 produced? Anybody taken a stock ZL-1 and flogged it on a dyno? I know the L-88 was WAY underrated and have heard real world numbers of around 560 HP for the L-88. Given the bigger cam of the ZL-1 I would think that it would better that number.

Re: Actual ZL-1 Horsepower.
 

[intercom voice] Paging COPO Pete, COPO Pete to your computer, please...[/intercom voice] https://www.yenko.net/ubbthreads/imag...iggthumpup.gif

Re: Actual ZL-1 Horsepower.
 

Just get a copy of the July '04 Chevey Rumble, its got Petes dyno test against a F*rd.

Re: Actual ZL-1 Horsepower.
 

In the June 2004 MuscleCar Enthusiast,Petes 427 Dynoed at 465HP & 426lb-ft of Torque.They bested it one last time by installing headers to reach 508.6HP & 470lb-ft. torque.
MERCY! https://www.yenko.net/ubbthreads/imag...ns/burnout.gif

Re: Actual ZL-1 Horsepower.
 

Engine dyno or chassis dyno? Through the mufflers? I recall the L-88 numbers I gave were at the flywheel with open headers. Thanks for the replys guys.

Re: Actual ZL-1 Horsepower.
 

Mr 70's is correct. I did build one and tore down in Michigan for the "Certified Stock" thingy. I should have decked the block as it was 40 thousands tall and the pistons ended up sitting in the hole too much! Actual compression when they worked it out was 10:8 to one https://www.yenko.net/ubbthreads/images/graemlins/no.gif It was flywheel horsepower, but also on what they call a "sad dyno" as apposed to a happy dyno, meaning, it is conservative. Still was enough to propell the car to 12.0's on more than one occasion on polyglas tires. Heads were NOS and never touched other than a valve job. Pistons were stock TRW units.
Peter

Re: Actual ZL-1 Horsepower.
 

If I am not mistaken there was a dyno run in 1969 in Hot Rod on the ZL-1. I don't remeber what they said the HP was but I will go and try to find the magazine this weekend.
JAG

Re: Actual ZL-1 Horsepower.
 

Sorry, goofed up on which magazine it was, great job Pete.

Re: Actual ZL-1 Horsepower.
 

Bill Porterfield did just this about 15 years ago with a carefully rebuilt engine from ZL1 #26.

All accessories, production 375.7 HP
exhaust manifolds, Camaro
chambered exhaust system,
36 degrees timing

As above with 2-1/8" headers 418.9 HP
replacing the manifolds

Air cleaner, alternator, AIR 447.2 HP
pump removed

Carb re-jetted, timing set 444.2 HP
to 39 degrees

Chambered exhaust system 523.6 HP
removed

Note the chambered exhaust system everybody craves cost almost 80 hp.

http://www.camaros.org/copo.shtml

Re: Actual ZL-1 Horsepower.
 

Great point about chambered exhaust. However, I've seen aftermarket stainless systems advertised with 2 1/2 or even 3" mandrel bending that might be o.k.