![]() Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
|
Register | Album Gallery | Thread Gallery | FAQ | Community | Calendar | Become a Paid Member | Today's Posts | Search |
![]() |
|
Thread Tools | Display Modes |
|
#1
|
|||
|
|||
![]()
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.
|
#2
|
|||
|
|||
![]()
[intercom voice] Paging COPO Pete, COPO Pete to your computer, please...[/intercom voice]
![]() |
#3
|
|||
|
|||
![]()
Just get a copy of the July '04 Chevey Rumble, its got Petes dyno test against a F*rd.
|
#4
|
||||
|
||||
![]()
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! ![]() |
#5
|
|||
|
|||
![]()
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.
|
#6
|
|||
|
|||
![]()
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
![]() Peter
__________________
Pete Simpson 1962-2013 RIP Owen Simpson Eric Simpson |
#7
|
|||
|
|||
![]()
Sorry, goofed up on which magazine it was, great job Pete.
|
#8
|
|||
|
|||
![]()
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
__________________
Learning more and more about less and less... |
#9
|
|||
|
|||
![]()
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.
|
#10
|
|||
|
|||
![]()
Had the joy of a A/Prod Vette with crate L-88 several years ago. I asked the guy I bought it off about the horsepower and said his engine was built for torque, the engine builder had told him it was 550lbs.
It drove like it, at around 4800-5200 it would break the tyres loose (Big 10" racing wheels). That was not on the gear change but on accelerating up thru the rev range, in third that's around 130mph with a nice twitch just to make sure you are paying attention. Junior Johnson once said "horsepower sells cars....torque wins races" When Tonawonda (forgive the spelling ) closed the NCRS did a feature on it and asked the guys there what the L-88s dynoed at, they said around 510hp, on the engine stand. |
![]() |
|
|