Need Opinions
05-10-2011, 06:06 PM
#1
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Need Opinions I have a motor form a 2004 GTO it had 7500 miles on it when i got it, it has 37000 miles on it now. Question is I'm doing a H/C build and do you think i need to replace the oil pump and timing chain? I have great pressure just wondering since it doesn't have 75k miles. plus the car is only driven maybe 2k a year. Thanks for everyone's input.
05-11-2011, 04:29 PM
#6
I've been researching lifter failures here and on the Vette sites, the majority seem to follow cam upgrades involving lobes with fast ramps.
My stock lifters held up to a TR224 cam for nearly 70K miles, but at least one of them seems to have failed. Noisy clatter at #8 intake, new valve springs only made it worse. Off came the heads and in went Lunati/Morel link bar lifters.
I'd say the stock lifters are fine for stock and mild cams, but hi-po lobes risk pushing them past their design limits.
My stock lifters held up to a TR224 cam for nearly 70K miles, but at least one of them seems to have failed. Noisy clatter at #8 intake, new valve springs only made it worse. Off came the heads and in went Lunati/Morel link bar lifters.
I'd say the stock lifters are fine for stock and mild cams, but hi-po lobes risk pushing them past their design limits.
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05-11-2011, 11:03 PM
#12
PS You have to pull the heads to get to the lifters on a LS series engine no matter what type/brand you use.
05-14-2011, 11:43 PM
#14
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youll still have to pull the head to reach the lifters, thats the nature of the ls1 design. change the lifters and chain and youll be fine. i dont believe in reusing timing chains.
05-15-2011, 07:07 AM
#15
... I've been working at a Chevy dealer for the past 10 years LS lifter failures are very rare. I belong to a very large Camaro club and never hear of LS lifter failures. We will agree to disagree sir. 
PS There have been a number of parts that have been upgraded or superseeded during the production of the LS series engine. Just an FYI for ya ... I have actually got better longiviety from the LS1 lifters than the LS7 design.
05-15-2011, 07:27 AM
#16
On the internet if someone reads something it automaticly becomes an epidemic of wide scale proportions ...... I've been working at a Chevy dealer for the past 10 years LS lifter failures are very rare. I belong to a very large Camaro club and never hear of LS lifter failures. We will agree to disagree sir.
... I've been working at a Chevy dealer for the past 10 years LS lifter failures are very rare. I belong to a very large Camaro club and never hear of LS lifter failures. We will agree to disagree sir. I observe that the majority of the stock lifter failures we hear of involve a combination of super-stiff valve springs, aggressive cam lobes, and hard use...all of which likely put the stock lifter beyond its design limit.
LS1 was the sealed engine package for the ASA series for a number of years. Try to find a lifter failure report. Rod bolts the first year, sure. And GM fixed it for the 2001 model year. The ASA cam has very modest lobes and only .525" lift, and they were getting entire seasons from a single engine.
05-15-2011, 09:56 AM
#17
If you just use the new linkbar lifters now then there is a good chance
you won't have a failure/head removal later.....correct?????
IMO for $40 bucks throw an LS2 t-chain in there and you could also blend
your oil-pump inlet/outlet/shim the bypass spring for increased vol./press
or if funds allow get a coated LS6 pump from S.D. or TSP
05-15-2011, 11:56 AM
#18
On the internet if someone reads something it automaticly becomes an epidemic of wide scale proportions ...... I've been working at a Chevy dealer for the past 10 years LS lifter failures are very rare. I belong to a very large Camaro club and never hear of LS lifter failures. We will agree to disagree sir.
PS There have been a number of parts that have been upgraded or superseeded during the production of the LS series engine. Just an FYI for ya ... I have actually got better longiviety from the LS1 lifters than the LS7 design.
... I've been working at a Chevy dealer for the past 10 years LS lifter failures are very rare. I belong to a very large Camaro club and never hear of LS lifter failures. We will agree to disagree sir. PS There have been a number of parts that have been upgraded or superseeded during the production of the LS series engine. Just an FYI for ya ... I have actually got better longiviety from the LS1 lifters than the LS7 design.
05-15-2011, 01:02 PM
#19
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Well I'm liking my Lunati link bar lifters. I have a StreetSweeper HT cam .612/.600 288/232 111 lsa on her and the new lifters have quieted down my sewing machine (proper pushrod measurement helped I'm sure). To me it was a good "while I'm in there" mod. It does require new pushrods for sure tho. They are .050 taller than stock and require a .025-.050 preload. 43,000 miles and still using the stock timing chain and pump.
