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Old 03-18-2014, 07:24 PM   #9157
litle88
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Pulled my heads apart and checked the valve springs, they show signs of fatigue but not sure if it's enough to cause lifter failure. I checked the one that failed and a random one.

Specs say 144lbs@1.810 Mine are 131@ 1.810

I have checked everything valve train related and can find nothing out of the ordinary except for the light spring pressure, If it's not light enough to cause lifter failure then I am thinking it's the lifters themselves. I am most likely switching to LS7 lifters with the new setup.

Any thoughts?
All lifters now are "Ls7" lifters.
Different cam with different lobes and a tear down of the engine. You've had way too much metal thru it IMHO.
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Old 03-18-2014, 07:46 PM   #9158
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Quote:
Originally Posted by litle88 View Post
All lifters now are "Ls7" lifters.
Different cam with different lobes and a tear down of the engine. You've had way too much metal thru it IMHO.
Doesn't seem right to have this many lifter failures. I'm going with the GPI SS4, Biran Tooley springs and milling the heads. I'm not planning on pulling the motor at this point, I'm waiting for it to blow up good so I can build something a bit more radical. lol With the oil pan and windage tray removed I can get everything pretty clean, I've been flushing and blowing out all the passages I can, if anything is trapped in a galley then I'll find out when it goes KABOOM.

I'm still wondering about the spring pressure, seems kind of light. I don't think it's the cam profile I've been running, haven't heard of a lot of failures with it. TSP VVT-3
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Old 03-19-2014, 03:30 PM   #9159
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Is this Lifter issue isolated to L99 a VVT?
If so why not try a conversion maybe the cause is elsewhere.
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Old 03-19-2014, 03:50 PM   #9160
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Originally Posted by Murray Maro View Post
Is this Lifter issue isolated to L99 a VVT?
If so why not try a conversion maybe the cause is elsewhere.

VVT has nothing to do with it. It's the AFM lifters that are a problem. In my case I've already replaced the lifters with LS3 lifters. I have been doing more research and am still thinking the PRC valve springs fatigue quickly.
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Old 03-19-2014, 07:59 PM   #9161
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Any thoughts on the GM Performance lifters?

Just for general info, L99 heads milled .040 = 64cc's
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Old 03-20-2014, 12:59 AM   #9162
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Any thoughts on the GM Performance lifters?

Just for general info, L99 heads milled .040 = 64cc's
You might want to ask Rhino about those. GPI is division of Gwatney Chevrolet. I'm sure he knows what's different about them.
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Old 03-20-2014, 07:48 PM   #9163
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Calling BTR tomorrow to order my cam kit. Hopefully this time I can actually get it ordered.
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Old 03-21-2014, 03:34 AM   #9164
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Any thoughts on the GM Performance lifters?

Just for general info, L99 heads milled .040 = 64cc's
That's about right. Milling heads rule if thumb is .007" = 1cc
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Old 03-21-2014, 05:45 AM   #9165
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I am out for Fest. Axis/rhino txt me. Broke my back...be in a brace for 3mo...L1 vertebrae. Could be dead...so is always a silver lining!
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Old 03-21-2014, 07:09 AM   #9166
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I am out for Fest. Axis/rhino txt me. Broke my back...be in a brace for 3mo...L1 vertebrae. Could be dead...so is always a silver lining!
Holy shit. I'll text you this afternoon. Glad you're not dead.
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Old 03-21-2014, 08:53 AM   #9167
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Any thoughts on the GM Performance lifters?

Just for general info, L99 heads milled .040 = 64cc's
Waste of money including the Cadillac lifters (high rpm and very light valve train needed).

BTR has morel/Lunati link bar street lifters for ~350 no more plastic trays that can cause your lifter to turn.
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Old 03-21-2014, 09:34 AM   #9168
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I will stick to road biking when recovered...mtb owned me.
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Old 03-21-2014, 10:37 AM   #9169
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Dang man. I hate that but your still here. Glad your still here.
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Old 03-21-2014, 01:15 PM   #9170
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Quote:
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How's the lifter bore?
I think that metal frags were still in the motor from the last.

Keep us posted. This SUCKS but it's still weird.
Also are you using Delphi or GM lifters?

Maybe a different kind? BTR, morel street lifters?
GM lifters are made by Delphi and one other company I forget right now.
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