ls7 lifters
02-12-2009, 02:00 PM
#23
Well they are proven performers as far as I know. They have been used in countless high power applications and seen consistent 7k rpms without failure. BUT, in an all-out, high-hp application, it's better insurance to pony up the dough and buy the Morell lifters.
02-12-2009, 05:01 PM
#24
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Well there are the LS7 lifters, and then there are the caddy lifters that are I believe part ceramic and more $$$. I believe they are for high rpms, that the LT1 will not reach without after market control.
03-01-2009, 03:01 AM
#28
GMPP offers another lifter that is better than the LS7's and it cost 3 times more but iys listed as being "THE" best lifter to run for high rpm applications. The pt# is 88958689.
03-01-2009, 03:29 AM
#30
Very interesting. Don't know if they're "needed" for our engines that won't see anything over 6,500 RPM. A lighter lifter can't hurt though, except in the wallet a bit.
Found this on the Caddy Forum:
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If any of you are considering upgrading your cam, check out these new GM Performance Parts lifters developed for the CTS-V Race cars.
http://www.sdparts.com/product/88958...esEngines.aspx
These lifters were developed for the CTSV Cadillac Race Team that used the “short stroke” LS7 style engines that raced in the Grand Am Cup Series during 2005. If you recall these engines were built using the LS7 block, LS7heads, and LS7 intake but the sanctioning body required the teams to meet the 5.7-liter engine size of 346ci. There were several different combinations tried but most of these engines used a stroke of approximately 3.200”. The demand to make race winning horsepower with a short stroke guarantees the unavoidable element of high RPM’s.
Initial testing, before these new lifters were developed, showed a definite valvetrain stability problem above 7000-rpm’s. Several remedies were tried, but in the end it was determined that the lifter had the biggest contribution to the RPM limit. This new lifter has internal changes made to the hydraulic components which resulted in a significant RPM increase. After installing the new lifters, these engines were now making power at 8000-rpm and they regularly saw 8500-rpm’s without any problems! WOW! The CTSV dominated the first races, not only did the sanctioning body enforce an RPM limit on the short stoke Caddies but they eventually implemented more restrictions to limit the horsepower on these LS7 equipped 346ci engines.
Everyone that has them says they are extremely quiet and work VERY well with aggressive cam lobes. I used the COMP CAMS Pro Magnum lifters in my 408 buildup and no matter how perfectly they are adjusted, they still rattle like a bunch of little diesel engines under my valve covers... and then my headers magnify the noise. Not cool for a $50K ride. I've also read a lot of stories about the COMP lifters breaking or wearing out with less than 10,000 miles on them.
Found this on the Caddy Forum:
---------------------------------------------------------------------
If any of you are considering upgrading your cam, check out these new GM Performance Parts lifters developed for the CTS-V Race cars.
http://www.sdparts.com/product/88958...esEngines.aspx
These lifters were developed for the CTSV Cadillac Race Team that used the “short stroke” LS7 style engines that raced in the Grand Am Cup Series during 2005. If you recall these engines were built using the LS7 block, LS7heads, and LS7 intake but the sanctioning body required the teams to meet the 5.7-liter engine size of 346ci. There were several different combinations tried but most of these engines used a stroke of approximately 3.200”. The demand to make race winning horsepower with a short stroke guarantees the unavoidable element of high RPM’s.
Initial testing, before these new lifters were developed, showed a definite valvetrain stability problem above 7000-rpm’s. Several remedies were tried, but in the end it was determined that the lifter had the biggest contribution to the RPM limit. This new lifter has internal changes made to the hydraulic components which resulted in a significant RPM increase. After installing the new lifters, these engines were now making power at 8000-rpm and they regularly saw 8500-rpm’s without any problems! WOW! The CTSV dominated the first races, not only did the sanctioning body enforce an RPM limit on the short stoke Caddies but they eventually implemented more restrictions to limit the horsepower on these LS7 equipped 346ci engines.
Everyone that has them says they are extremely quiet and work VERY well with aggressive cam lobes. I used the COMP CAMS Pro Magnum lifters in my 408 buildup and no matter how perfectly they are adjusted, they still rattle like a bunch of little diesel engines under my valve covers... and then my headers magnify the noise. Not cool for a $50K ride. I've also read a lot of stories about the COMP lifters breaking or wearing out with less than 10,000 miles on them.
Last edited by Paul Bell; 03-01-2009 at 03:35 AM.
