1/4 Mile Times Stock LS-6 - Chevelle Tech
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post #1 of 33 (permalink) Old Jul 23rd, 06, 10:13 PM Thread Starter
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1/4 Mile Times Stock LS-6

This is a quick follow up post on the LS-6 we delivered a few weeks back. If you do a search you'll get a rundown on the unit. They made a few passes the previous weekend and just called me the with the numbers. The car ran 12.6's at 107 MPH, I have to double check the MPH number, he had a bad connection on his cell phone. The car weighs 4000# with the driver and has factory tires in the rear. This is the first one we set up for the F.A.S.T. class drags. Thanks, Gary in N.Y.

P.S. The unit is 99.9% stock. The only non-stock parts are the 6.385 rods and a set of Probe "slugs". It uses a 10:1 C.R. and a 238 @ .050" cam. The cam has less duration than stock but more lift. Unit runs with 13 inches vacuum. Power brakes work fine. Stock intake manifold, exhaust manifolds, and carb. Runs on 93 with all 36 degrees of timing up front, no starting issues even with the hot weather. Should do slightly better in cooler weather also!
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post #2 of 33 (permalink) Old Jul 23rd, 06, 10:56 PM
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Re: 1/4 Mile Times Stock LS-6

That is pretty good, but its not stock. With the newer parts and minor changes, it also benefits from a more careful assembly than the factory LS6's of 36 years ago. Many long years ago when I worked the parts counter at a big Chevy dealer I had one customer who regularly bought LS6 engines to install in his customers cars. I was surprised when visiting his shop one day to see that he had completely disassembled a brand new engine that I had sold him. He told me that he always disassembled these engines and checked and adjusted clearances, ring gaps. etc.

Congrats to your customer for a good first showing at the drags - where do you think the car's performance will end up at e.t. & mph?

Thomas

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post #3 of 33 (permalink) Old Jul 23rd, 06, 11:58 PM
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Re: 1/4 Mile Times Stock LS-6

Nice times. Automatic car? Repo tires (coker)? Cool seeing someone race a rare and expensive car.

Mike
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post #4 of 33 (permalink) Old Jul 24th, 06, 8:06 AM
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Re: 1/4 Mile Times Stock LS-6

Gary,what is the advantage of the 6.385 rods and the Probe pistons?
I'm guessing they are alot lighter than stock
Pretty impressive performance considering stock intake,manifolds,etc.
original post:
1970 LS-6 Pump-gas Special
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post #5 of 33 (permalink) Old Jul 24th, 06, 9:03 AM Thread Starter
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Re: 1/4 Mile Times Stock LS-6

Quote:
Originally Posted by mr 4 speed
Gary,what is the advantage of the 6.385 rods and the Probe pistons?
I'm guessing they are alot lighter than stock
Pretty impressive performance considering stock intake,manifolds,etc.
original post:
1970 LS-6 Pump-gas Special
Hi Chris, the long rod gives a more efficient "burn" and the "Probes" are actually part of an ongoing test of their pistons. We chose them for a number of reasons, first they have a decent price, second, they came in 540 grams with some dome removed, and third, they're forged on the 2618 blanks. They did come without pin-oilers and at first we were going to install them but changed our minds as part of the piston "test". The unit is already scheduled to be redone over the winter season with an upgrade on the cam from the 238/248 x .550-.570 to a 248/258 x .570-.600.

The E.T.'s are not too bad considering the street tires but we're dissappointed in the mile-per-hour. We need more upstairs. As of today we feel the cam is the deterrent. But you have to remember the power-brakes MUST be functional. They work good with the existing cam and we want to try the next one up! The larger cam will do 2 services, it'll give more power in the upper band AND kill some low-end Torque where we don't need it with the street tires. The 4000# weight is a benefit with "hooking".

A "key" item to remember here is it runs fine on 93 with all the timing up front, the C.R. as I stated has been knocked back to exactly 10:1. this is NOT a stroker, these units get "pumped-up" for size at the meets.

I have a 402" '70 Nova headed to the dyno this week for the same class racing. A square port head and ALL stock inside pieces. No lightweight parts whatsoever, no "tricks". This one has the stock 242 x.500 cam AND stock rocker arms. Thanks, Gary in N.Y.

P.S. 68chevelle533: Car is automatic with stock convertor and I'm not sure about the tires, but I believe the "rules" for his class must have the identical ones there when the car was delivered new. To the best of my knowledge,
no radials allowed. Strict rules for his class, no MSD's, stock coil, stock wires, stock valve covers, etc.
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post #6 of 33 (permalink) Old Jul 24th, 06, 10:24 AM
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Re: 1/4 Mile Times Stock LS-6

hey gosfast, where are you located on long island. i too am on long island thanks gary
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post #7 of 33 (permalink) Old Jul 24th, 06, 10:30 AM
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Re: 1/4 Mile Times Stock LS-6

are you allowed to put a better torque converter in it? would it hook with a better torque converter?
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post #8 of 33 (permalink) Old Jul 24th, 06, 10:53 AM
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Re: 1/4 Mile Times Stock LS-6

Quote:
Originally Posted by kstanbach
are you allowed to put a better torque converter in it? would it hook with a better torque converter?
...not in that class
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post #9 of 33 (permalink) Old Jul 24th, 06, 12:25 PM
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Re: 1/4 Mile Times Stock LS-6

Quote:
Originally Posted by GOSFAST

A "key" item to remember here is it runs fine on 93 with all the timing up front, the C.R. as I stated has been knocked back to exactly 10:1. this is NOT a stroker, these units get "pumped-up" for size at the meets.

Gary, I have always wondered how they pump these things up at a track? They do this right to check the displacement?

Are they allowed to port the intake, heads, and exhaust manifolds? Would they benifit from extrude (I think this is what its called) honing/porting on the stock exhaust manifolds?

How do they know what is in there for a cam at the track? Could a solid roller be hidden inside one of these beasts?

Pretty impressive for stock tires of what 14" or15" bias plys on a 7" or 8" rim.

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post #10 of 33 (permalink) Old Jul 24th, 06, 1:20 PM
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Re: 1/4 Mile Times Stock LS-6

That alot faster than stock!! http://www.ls-6.com/1970_chevelle_454_ls6.htm
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post #11 of 33 (permalink) Old Jul 24th, 06, 1:47 PM
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Re: 1/4 Mile Times Stock LS-6

Intersting... that AHRA record holder kind of proves that a true STOCK LS-6 - the biggest and baddest muscle car ever - wasn't much faster than a modern chevelle with a steetable warmed over 383 small block. We've come a long way!
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post #12 of 33 (permalink) Old Jul 24th, 06, 2:09 PM
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Re: 1/4 Mile Times Stock LS-6

Quote:
Originally Posted by novadude
Intersting... that AHRA record holder kind of proves that a true STOCK LS-6 - the biggest and baddest muscle car ever - wasn't much faster than a modern chevelle with a steetable warmed over 383 small block. We've come a long way!
Exactly what crossed my mind. My bro-in-law's '69 Malibu with a mild 383 runs mid 12.60s.

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post #13 of 33 (permalink) Old Jul 24th, 06, 2:15 PM
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Re: 1/4 Mile Times Stock LS-6

Quote:
Originally Posted by artmalibu
That alot faster than stock!! http://www.ls-6.com/1970_chevelle_454_ls6.htm

Not faster..but quicker,and that's all due to the 60 ft.
If you notice,both the AHRA record holder and the motor Gary built both have basically the same MPH,but the AHRA car certainly wasn't hooking up back in the day..in fact,none of them did.
Pay attention to the MPH,not the ET (I don't mean to sound like a jerk)
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post #14 of 33 (permalink) Old Jul 24th, 06, 2:24 PM
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Re: 1/4 Mile Times Stock LS-6

106 is the mph for a mid 12 second car...

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post #15 of 33 (permalink) Old Jul 24th, 06, 3:49 PM
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Re: 1/4 Mile Times Stock LS-6

Quote:
Originally Posted by dreis454
106 is the mph for a mid 12 second car...
even at 107 its still in the "hooking" up range. my chevelle runs in the area of 105-107 to 12.6-12.4

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