SHOCKED 243 castings factory on 02 Z28???
06-04-2006, 05:08 AM
#81
Originally Posted by Rubadubdub
And maybe it's an isolated occurance. Would GMHIGHTECH have know about that? Would GM? No. It's the factory folks, you know, the people that used to stick empty Coke and beer cans in cars. lol
It doesn't matter who put the heads on at the factory, you'd think that in 4 years SOMEONE would have noticed this and said something.
The car was sold as new, but had 45 miles on it. Maybe there was a problem and the 243's were substituted, but I doubt anyone else got them. I'm still waiting for the original poster to say "haha, made you look!" 
06-06-2006, 11:10 PM
#83
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Since there are a number of 01 and 02 cars with LS6 blocks, it's perfectly believable that there were some cars that got 243 heads as well. With production coming to a close just around the corner, GM certainly wouldn't want to waste time and money casting new 241 heads just for the f-bodies.
Besides, with most of the factory rated 345hp SLP cars being 02 models, it would stand to reason to use 243 heads on those instead of the GTO's. Come on guys, it's GM. The last production year of any vehicle was always the best.
Jason
Besides, with most of the factory rated 345hp SLP cars being 02 models, it would stand to reason to use 243 heads on those instead of the GTO's. Come on guys, it's GM. The last production year of any vehicle was always the best.
Jason
06-07-2006, 06:31 PM
#84
Originally Posted by Camaro99SS
Since there are a number of 01 and 02 cars with LS6 blocks, it's perfectly believable that there were some cars that got 243 heads as well. With production coming to a close just around the corner, GM certainly wouldn't want to waste time and money casting new 241 heads just for the f-bodies.
Besides, with most of the factory rated 345hp SLP cars being 02 models, it would stand to reason to use 243 heads on those instead of the GTO's. Come on guys, it's GM. The last production year of any vehicle was always the best.
Jason
Besides, with most of the factory rated 345hp SLP cars being 02 models, it would stand to reason to use 243 heads on those instead of the GTO's. Come on guys, it's GM. The last production year of any vehicle was always the best.
Jason
07-23-2006, 11:37 AM
#87
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Quick question guys...i have just purchased a set of 243 heads with yellow valve springs that are getting ported at the moment..am currently running ported 241 heads with Crane cam,lifters,pushrods,gold roller rockers..I am not planning on changing anything other than the heads,but am concerned about different length valve stems.Will i have to go to a shorter pushrod or can i just reset the preload on the lifters during reassembly to avoid this..sorry i can't tell you the length of the pushrods but they came as a kit with the gold race rockers..
Cheers
Did some research and pretty sure that the crane pushrods are stock GM length.So am really just a bit conserned about valve stem length..thanks guys
Cheers
Did some research and pretty sure that the crane pushrods are stock GM length.So am really just a bit conserned about valve stem length..thanks guys
Last edited by spanks; 07-23-2006 at 11:58 AM.
07-23-2006, 12:08 PM
#88
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Originally Posted by Jpr5690
Mine Came With A Ls6 Block And 241 Heads
My holden has the same combo...LS6 block and 241 heads.The guys over here were going nuts when they found out that most 02 onwards Holden LS1 were LS6 blocks..They thought all there christmas's had come at once
07-23-2006, 01:36 PM
#89
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Originally Posted by spanks
Will i have to go to a shorter pushrod or can i just reset the preload on the lifters during reassembly to avoid this..sorry i can't tell you the length of the pushrods but they came as a kit with the gold race rockers..
07-23-2006, 02:55 PM
#90
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unless i see pictures and can have hard evidence that the car was never ever ever ever touched its complete BS.
LS6 block is not an upgrade in fact its worse than an LS1 block. the only good part about an LS6 block is the removable sleeves. the block itself is weaker than the LS1. LS1 blocks are more desirable for higher hp applications.
mid/late 00 is when they switched to 241 casting heads on LS1s. my 00 has 241 heads where as my buddies 00 has 853s.
LS6 block is not an upgrade in fact its worse than an LS1 block. the only good part about an LS6 block is the removable sleeves. the block itself is weaker than the LS1. LS1 blocks are more desirable for higher hp applications.
mid/late 00 is when they switched to 241 casting heads on LS1s. my 00 has 241 heads where as my buddies 00 has 853s.
07-23-2006, 02:59 PM
#91
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The only way I know of a f body coming with 243 heads were warranty work was done on the motor. There was a time when GM was short on LS1 blocks and if you had your car in for a motor swap they just sent a LS6 long block. Other than that I dont know. But that did happen to the few lucky peeps out there. And I heard but never verified @ the end of the prodution run there were some with the full ls6 in new cars. Maybe this confirms it.
07-23-2006, 03:16 PM
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Originally Posted by Cop Car
unless i see pictures and can have hard evidence that the car was never ever ever ever touched its complete BS.
LS6 block is not an upgrade in fact its worse than an LS1 block. the only good part about an LS6 block is the removable sleeves. the block itself is weaker than the LS1. LS1 blocks are more desirable for higher hp applications.
mid/late 00 is when they switched to 241 casting heads on LS1s. my 00 has 241 heads where as my buddies 00 has 853s.
LS6 block is not an upgrade in fact its worse than an LS1 block. the only good part about an LS6 block is the removable sleeves. the block itself is weaker than the LS1. LS1 blocks are more desirable for higher hp applications.
mid/late 00 is when they switched to 241 casting heads on LS1s. my 00 has 241 heads where as my buddies 00 has 853s.
Do you even have a higher horsepower car? I know about the differences between a LS1 and LS6 block. But lets gets this right. A iron block is what you want when you make insane horsepower!
07-23-2006, 08:14 PM
#94
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Who cares what came from the factory? The factory has been bull dozed and there is no one to verify anything -- heck even SLP is gone.
If the issue is lots of horsepower, my heads have strange markings on them -- AFR205. Make just about the same as a new Z06.
If the issue is a rare ride -- if the factory won't back you up -- it doesn't exist. Go to Pebble Beach some day and you will see what I mean.
If the issue is lots of horsepower, my heads have strange markings on them -- AFR205. Make just about the same as a new Z06.
If the issue is a rare ride -- if the factory won't back you up -- it doesn't exist. Go to Pebble Beach some day and you will see what I mean.
07-24-2006, 04:15 AM
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Originally Posted by muncie21
If you are using the stock pushrods, you don't have to do anything special. The longer valve stems will put a small additional preload on the lifters, but nothing to be concerned about. Just use the standard torque procedure.
Thanks for your input..have one on me
07-24-2006, 10:44 PM
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Originally Posted by Black Z/28
Jeez, I never new that the LS6 block was such a POS.
08-17-2006, 04:06 PM
#99
How about an LS6 block in a 02 1SC? I would have to think that could be a collector one day.
241's on it though, although GM has done this before, quite a few times in the past. So as far as having different heads on a high performance car in a GM Vehicle I wouldn't doubt it one bit.
Its what makes the hobby fun.
241's on it though, although GM has done this before, quite a few times in the past. So as far as having different heads on a high performance car in a GM Vehicle I wouldn't doubt it one bit.
Its what makes the hobby fun.
