Stock 1/4 Mile performance of ZL-1 or COPO

**Stefano** · #1 05-11-2002, 03:14 AM

OK guys when I am wrong I'll take it like a man, but I picked the info up from our own site <A HREF="https://www.yenko.net/oldads/yad11.jpg

" TARGET=_blank>https://www.yenko.net/oldads/yad11.jpg

</A> While slightly opimistic I agree, we all know that if it is in print on this site it must be accurate.

I did dig up a couple of magazine reprints/reruns of the same article and they do say 11.94 @ 114.5 mph.

The #3 ZL1 could have turned in better times but for the fact that, Clill was the test pilot. Look at the pictures, it's him 33 years ago

COPO PETE · #2 05-11-2002, 10:16 AM

I did'nt realize Charlies car ws tested with the 780! When we rented the track to test for the Pure Stock Drags, the best we could get out of the 780 was 12.80's. When the 850 was put on we finally got it down to 12.40's that day. Also picked up 3 mph! This is on F70-14 polyglas tires. Since then it's gone better yet. Keep in mind we did certify and went with the heads off so they could check and measure everything and look for porting!
Peter

JoeC · #3 05-11-2002, 01:46 PM

Pete the ZL1 run of 13.16 was on 15x7 tires. The 15x7 may give a better 60 ft. but the 14x7 will give numerically high gear ratio. Do you think that will have any effect on the ET?

COPO PETE · #4 05-11-2002, 10:42 PM

Joe,...Yes I do think the 14" would help it get a better et, and maybe a better 60 foot, depending on the traction. Also, I'm running a 4:56 behind the ZL-1. On both my iron motor cars, the 4:56 gave the cars 2 tenths over the 4:10 ratio. The ZL-1 like to be treated like a small block.7000 shifts at each gear change and it goes through the end at 7200.
Peter

**mhassett** · #5 05-13-2002, 11:48 AM

Hey Guys, I found a Car Review Magazine from 1986 that tested 3 ZL-1's
Dick Harrell tested 2--adding headers and slicks to an automatic he turned an 11:85 at 119.06 with a full exhaust system. Uncapping the headers dropped the figures to 11:64 at 122.15.
The other Zl-1 received the Super Stock Race Treatment (engine remaining untouched internally) and managed a 10:29 at 132.05.
The 3rd Zl-1 (My car) then owned by Mr. Rusty Symmes during Car Review's Magazine Supercar Showdown, June 20-21, 1986 at Bowling Green, Kentucky's Beech Bend International Raceway, he slapped on a pair of slicks and ran through the quarter in 12:76 at 107.65.
Before that pass many in the crowd looked upon Rusty Symmes car as just another camaro, after the run they became educated joining the enlightened few who know full well the signifance of the RPO code "ZL-1"
Mark

JoeC · #6 05-13-2002, 12:51 PM

The article in Car Review Magazine 1986 was a reprint of the Super Stock magazine May 1969 article that tested the two Dick Harrell ZL1s. The one that ran in the 10s was a AHRA Super Stocker with a fiberglass nose and many other modifications.

J Rod · #7 05-13-2002, 03:36 PM

Thanks for the replys thus far. I have not had time to go digging through my magazine collection and try to find any print articles which might back up the 10 second performance data.

I along with many others have been "discussing" this topic with many of the "import" crowd who simply do not understand what Big Block torque and HP is all about.

As I said, I came on here because there seems to be quite a few owners, and quite a few folks who would be quite knowledgeable about these particular cars.

So anyhow, if any of you have any articles or sources of a 10 second run on a ZL-1 or COPO car in "stock" form. I would appreciate it

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