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Can L76 Springs be used with an XP Cam??





I dont mind getting 105 springs but i just wanted to check if they were needed or not.

Would switching my l76 springs for 105 springs and putting back my stock rockers all i need to do? The LS retainers on now can be used with the 105 springs correct?
 
I would go 105's just to refresh things. The LS retainers will need to stay, and swap back to your stock rockers.
 
GOTIT4CHEAP16 said:
I dont mind getting 105 springs but i just wanted to check if they were needed or not.

Would switching my l76 springs for 105 springs and putting back my stock rockers all i need to do? The LS retainers on now can be used with the 105 springs correct?
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The retainers will work with the 105s. Don't go with L76s because they're just not enough spring for the ramp rate and lift of the XP cam. Even with stock shift points (which is like cutting the balls off your cam) you're going to end up in a bad place in a short amount of time on the L76s.
 
So what are you deciding on?

Also a lot of people throw **** on the comp 105 springs... I accidentally ordered them and found out later that everyone goes with crow or "pro comp" springs. Well I've have them in for about 15,000 hard miles and they're in perfect condition.

They had a few bad batches when they moved production but I've only heard good things since.
 


SnowFlake said:
So what are you deciding on?

Also a lot of people throw **** on the comp 105 springs... I accidentally ordered them and found out later that everyone goes with crow or "pro comp" springs. Well I've have them in for about 15,000 hard miles and they're in perfect condition.

They had a few bad batches when they moved production but I've only heard good things since.
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Just because you got lucky doesn't mean other people are willing to take the risk. I for one wouldn't.

Either go with Crow 105's or Get GM LS6 Yellow 90's. I ran them with my XP shifting at 6300? I can't remember...been a few years. Had them for 40K...never ran into any issues.

The reason people recommend L76 springs is because they are cheap and readily available. They do their job just like Yellow 90's...and countless people
have them in for about "X" hard miles and they're in perfect condition
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...go by your method of thinking as well. In fact there is a regular on here with an XP'd, Intercooled, High Compression motor on L76's...runs like a raped ape. Commonly used for 1.9 rocker setups but they have been tried and true so far on VS/S1X/XP cars as well.
 
Blue you seem to lack a fundamental understanding of why 1 spring is chosen over the other. I suggest reading up on the differences of lobe profiles that the various cams have vs stock and each other. Then read up on spring rates and seat pressures at various amounts of lift. Also I suggest that you get a handle on max lift ratings and coil bind.

After all of your reading you should attempt to logically connect all the dots. If you find yourself anywhere but 105# springs for an XP cam you should start all over again until the dots match up.

You can't just
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everything and cross your fingers that it works. I hope that anyone reading this thread won't go out and buy L76 springs for their XP cam, it's a terrible decision.
 


Thanks for that useful post...I'll look into it...Right after I install a few XP's and S1X's with L76 and LS6 springs.

.............................maybe you should check your springs...see how they're doing. Hopefully you didn't get stuck with one of the bad Mexico batches like thousands of others did.

OP: Like stated, I ran LS6 Springs for over 40k...got rid of them and my XP for 130's and the Thrasher for my build. I daily'd the car for about 2 years that way then parked it and shoved it aside. On any aftermarket cam using the stock chain/dampner...I would however tell you to yank off the front cover and check the dampner every 50K or so...because depending on where the idle is set at, it could chew it up pretty quick. I had my idle set at 750. Dampner was almost gone after 40,xxx. Or you could bypass all this petty back and forth bullsh1t and get Manley 130's. Then you could really rev it and utilize every bit of the powerband of the XP and not have to worry about which valve springs to buy.
 
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bluegtp91 said:
Thanks for that useful post...I'll look into it...Right after I install a few XP's and S1X's with L76 and LS6 springs.

.............................maybe you should check your springs...see how they're doing. Hopefully you didn't get stuck with one of the bad Mexico batches like thousands of others did.

OP: Like stated, I ran LS6 Springs for over 40k...got rid of them and my XP for 130's and the Thrasher for my build. I daily'd the car for about 2 years that way then parked it and shoved it aside. On any aftermarket cam using the stock chain/dampner...I would however tell you to yank off the front cover and check the dampner every 50K or so...because depending on where the idle is set at, it could chew it up pretty quick. I had my idle set at 750. Dampner was almost gone after 40,xxx. Or you could bypass all this petty back and forth bullsh1t and get Manley 130's. Then you could really rev it and utilize every bit of the powerband of the XP and not have to worry about which valve springs to buy.
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130s are overkill for an XP cam, there's no reason to rev out higher than about 6300 without headwork and a bigger cam. The 105s are perfect. L76s aren't good enough and LS6s are a poor choice as well since they're harder on the timing set and less effective against valve float than the 105s (among many other reasons). This is why your damper was gone so shortly.

Your sarcastic attitude doesn't help your lack of knowledge and logical thinking. It's abundantly clear that you don't know anything about the variables I was mentioning before, and you most likely built your car using the he said/she said method.

L76s are rated to .520 lift and the XP is like .536, and over .550 if you have a 1.66 rocker like some 3800 engines... at the installed height on our motors, which will usually come in a little shorter than 1.8, you're losing even more lift capability. The spring is also too soft to handle the ramp rates of the xp cam. Anyone who uses these springs hasn't done their homework. The "countless" people you're talking about must be hiding in the woodwork... or be broken down on the side of the road right now.

Maybe someday you can stop jumping down my throat in every thread and you might learn something.
 
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SnowFlake said:
L76s are rated to .520 lift and the XP is like .536, and over .550 if you have a 1.66 rocker like some 3800 engines... at the installed height on our motors, which will usually come in a little shorter than 1.8, you're losing even more lift capability.
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that is the information the OP needed in the first post.

The lift is not going to work for the XP. The best spring for this application would be a Crowe 105#
 
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