Numbered connecting rods
Thread Starter
Joined: Mar 2003
Posts: 10,617
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From: Little Austin
Re: Numbered connecting rods Well I mounted the dial indicator the best I could and got a reading of .239 lift on the pushrod side of an exhaust rocker. With a 1.7 ratio that comes out to .406 valve lift. Does that ring any bells with anyone?
There was also a casting number when I took the valve cover off, it read 248. Anyone know what that is?
Andrew
There was also a casting number when I took the valve cover off, it read 248. Anyone know what that is?
Andrew
Thread Starter
Joined: Mar 2003
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From: Little Austin
Re: Numbered connecting rods Does anyone see any more clues in this picture?
How about here?
The valve spring have a yellow and green stripe on them.
Thanks for all the help guys!
Andrew
How about here?
The valve spring have a yellow and green stripe on them.
Thanks for all the help guys!
Andrew
TECH Apprentice
Joined: Jan 2002
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From: Nottingham, Notts, England, UK
Re: Numbered connecting rods I wouldn't stamp the rods but would use an engraver. Maybe this engine was blueprinted by GM and given a test run. There are engines being sold as 'assembled and test run' and these may be development engines. Could be a really good engine if it comes with a warranty.
Thread Starter
Joined: Mar 2003
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From: Little Austin
Re: Numbered connecting rods From the looks of the plugs and exhaust ports, it certainly does not look like the engine was run. I should mention that the rods were indeed engraved and not stamped as I previously stated.
Andrew
Andrew
Re: Numbered connecting rods Norm from www.Westechauto.com has seen a lot of pre-production stuff you could check with him.
Does that motor have a special history or anything?
Does that motor have a special history or anything?
Thread Starter
Joined: Mar 2003
Posts: 10,617
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From: Little Austin
Re: Numbered connecting rods Thanks John. It was good seeing you last night at RSD. I was the guy with the glasses and gotee. If anyone else has any ideas I am all ears.
Andrew
Andrew
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TECH Veteran
Joined: Aug 2002
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From: Hartsdale, NY
Re: Numbered connecting rods I read about the engine assembly plant in Canada. It told about the differences between the LS1 and LS6 engines...
...it said the engines are test fired at the factory. ...gues what they use for fuel...?
Natural gas!!!!! ...so it would be hard to tell if the engines comming from the factory have been run or not...
....this engine seems like a GM test mule...I bet it was run on an engine dyno....
A cam lift of that magnitude is definatly not stock, right?
...how about doing a compression test?
...it said the engines are test fired at the factory. ...gues what they use for fuel...?
Natural gas!!!!! ...so it would be hard to tell if the engines comming from the factory have been run or not...
....this engine seems like a GM test mule...I bet it was run on an engine dyno....
A cam lift of that magnitude is definatly not stock, right?
...how about doing a compression test?
Thread Starter
Joined: Mar 2003
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From: Little Austin
Re: Numbered connecting rods Thanks for keeping this thread alive. I talked to Norm at Westech and he was very helpful. It seems that this engine could have been built anytime during the preproduction process. There is really no way to tell when exactly. If it was a later prototype, then I am fairly safe in using the engine. If however it was an early build, then there may be potential problems.
I don't have a compression tester, but I may have to get one. Can the compression be tested by spinning the engine over by hand?
Andrew
I don't have a compression tester, but I may have to get one. Can the compression be tested by spinning the engine over by hand?
Andrew
Re: Numbered connecting rods It definitely could be a pre-production engine.
Back in July 1999 GMHTP reported of a Phantom LS6 spotted. Here's what it read.
"This one's from the "you ain't gonna believe it department". Last Fall at the final GMHTP Shootout at E-Twon, NJ we ran across a very interesting Vette. It was 99 coupe with 6-speed. What's unusual about it was the chrome "LS6" emblem on the right rear bumper. We approached the owner, who said he bought it new at a NJ Chevy dealership a few days before. The salesman told him it wad part of a limited production of 400-hp Vettes. We said "yeah right" and moved on.
While researching another story, we rubbed shoulders with one out many "deep throat" operatives within GM. Our source,who is in a position to know, verified the LS6 nomenclature as well as the "near 400-hp" figure. The car is scheduled to be in dealer showrooms bt late this year. As best we can tell several LS6 prototypes were built at the Bowling Green,,KY assmebly for use in certification. It's possible that enoght parts were left over for a fw to built and shipped, but more likely that shipping error resulted in one of these babies being accidently sent to a dealership."
If I remember right the pre-production LS6's had a different oil pan or windage/baffle tray and were eventually changed for production.
Back in July 1999 GMHTP reported of a Phantom LS6 spotted. Here's what it read.
"This one's from the "you ain't gonna believe it department". Last Fall at the final GMHTP Shootout at E-Twon, NJ we ran across a very interesting Vette. It was 99 coupe with 6-speed. What's unusual about it was the chrome "LS6" emblem on the right rear bumper. We approached the owner, who said he bought it new at a NJ Chevy dealership a few days before. The salesman told him it wad part of a limited production of 400-hp Vettes. We said "yeah right" and moved on.
While researching another story, we rubbed shoulders with one out many "deep throat" operatives within GM. Our source,who is in a position to know, verified the LS6 nomenclature as well as the "near 400-hp" figure. The car is scheduled to be in dealer showrooms bt late this year. As best we can tell several LS6 prototypes were built at the Bowling Green,,KY assmebly for use in certification. It's possible that enoght parts were left over for a fw to built and shipped, but more likely that shipping error resulted in one of these babies being accidently sent to a dealership."
If I remember right the pre-production LS6's had a different oil pan or windage/baffle tray and were eventually changed for production.
TECH Veteran
Joined: Aug 2002
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From: Hartsdale, NY
Re: Numbered connecting rods ....BLKTA:
...So this 99 LS6 Vette was the precourser to the ZO6, right?
...if an early unit was accedentilly shipped to a dealer in error, do you think it would be hard to register the car since the new engine class would have had to pass emmisions verification under the law?
...So this 99 LS6 Vette was the precourser to the ZO6, right?
...if an early unit was accedentilly shipped to a dealer in error, do you think it would be hard to register the car since the new engine class would have had to pass emmisions verification under the law?
