ls7 lifter preload
Thread Starter
Staging Lane
Joined: Feb 2011
Posts: 52
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It was after I spun it by hand a few revolutions did they start popping out. Not while I was setting them. Im going to try and reset them in the next few mins so I'll see what happens and let yall know. Thanks for all the help. I dont know what I would do without this site lol.
You could indentify #1 cyl TDC compression, then mark your damper with a mark every 90 degrees. Start with #1 cyl TDC compression, adjust both intake and exhaust valves. Rotate engine 90 degrees and set both valves on cyl #8 and just continue with each cylinder following the firing order 1-8-4-3-6-5-7-2 whiile rotating the engine 90 deg for the next cyl.
cardo0, bowtienut is correct. The more lifter preload you put into it the more it will hold the valve off the seat when it pumps up. The lifter pumps up to whatever preload you put it at. Preload is in essence the amount of added travel you'll put into the lifter (and pushrod, rocker, valve) when it pumps up.
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Joined: Dec 2008
Posts: 4,145
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From: Little Rock, AR
cardo0, bowtienut is correct. The more lifter preload you put into it the more it will hold the valve off the seat when it pumps up. The lifter pumps up to whatever preload you put it at. Preload is in essence the amount of added travel you'll put into the lifter (and pushrod, rocker, valve) when it pumps up.
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Banned
Joined: Jan 2013
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From: Las Vegas
Dufus hasn't pissed off anyone with clout.
Then im P'n off the right losers. So hey have u figured out how a lifter bleeds down yet??
Adj the preload only a 1/4 turn is bad advice to a novice. It requires frequent readjustment as the vlv train wears and that reduces preload to near zero. 1/4 turn also allows the lifter to "shorten" from fast bleed down rates and air in the oil (aerated oil) reducing lift. Maximizing preload is something else u dont understand.
cardo0, bowtienut is correct. The more lifter preload you put into it the more it will hold the valve off the seat when it pumps up. The lifter pumps up to whatever preload you put it at. Preload is in essence the amount of added travel you'll put into the lifter (and pushrod, rocker, valve) when it pumps up.
Yes 93Z2871805, u are correct and i stand corrected. I was so P'd off with all the other stupid advice they were giving 97formula17 i didnt bother to look it up and got it backwards. Thx for your honesty without being malicious.
cardo
Then im P'n off the right losers. So hey have u figured out how a lifter bleeds down yet??
Adj the preload only a 1/4 turn is bad advice to a novice. It requires frequent readjustment as the vlv train wears and that reduces preload to near zero. 1/4 turn also allows the lifter to "shorten" from fast bleed down rates and air in the oil (aerated oil) reducing lift. Maximizing preload is something else u dont understand.
cardo0, bowtienut is correct. The more lifter preload you put into it the more it will hold the valve off the seat when it pumps up. The lifter pumps up to whatever preload you put it at. Preload is in essence the amount of added travel you'll put into the lifter (and pushrod, rocker, valve) when it pumps up.
Yes 93Z2871805, u are correct and i stand corrected. I was so P'd off with all the other stupid advice they were giving 97formula17 i didnt bother to look it up and got it backwards. Thx for your honesty without being malicious.
cardo
Trickflow or GMPP guideplates will fit better than say a Comp but still not great. I ended up going Isky adjustable. The LT1 valve spacing is slightly different than older smallblocks.
TECH Veteran
Joined: Apr 2008
Posts: 4,985
Likes: 112
as capricemgr notes, the ISKY's work better on the LT1 heads. they are a 2 part guide plate so you can set them up so each RR is dead nuts center on the valve tip. you may have to grind some of the ISKY plates if you need them closer together on some valves.
[U]Adj the preload only a 1/4 turn is bad advice to a novice. It requires frequent readjustment as the vlv train wears and that reduces preload to near zero. 1/4 turn also allows the lifter to "shorten" from fast bleed down rates and air in the oil (aerated oil) reducing lift.
Dufus hasn't pissed off anyone with clout.
Then im P'n off the right losers. So hey have u figured out how a lifter bleeds down yet??
Adj the preload only a 1/4 turn is bad advice to a novice. It requires frequent readjustment as the vlv train wears and that reduces preload to near zero. 1/4 turn also allows the lifter to "shorten" from fast bleed down rates and air in the oil (aerated oil) reducing lift. Maximizing preload is something else u dont understand.
cardo0, bowtienut is correct. The more lifter preload you put into it the more it will hold the valve off the seat when it pumps up. The lifter pumps up to whatever preload you put it at. Preload is in essence the amount of added travel you'll put into the lifter (and pushrod, rocker, valve) when it pumps up.
Yes 93Z2871805, u are correct and i stand corrected. I was so P'd off with all the other stupid advice they were giving 97formula17 i didnt bother to look it up and got it backwards. Thx for your honesty without being malicious.
cardo
Then im P'n off the right losers. So hey have u figured out how a lifter bleeds down yet??
Adj the preload only a 1/4 turn is bad advice to a novice. It requires frequent readjustment as the vlv train wears and that reduces preload to near zero. 1/4 turn also allows the lifter to "shorten" from fast bleed down rates and air in the oil (aerated oil) reducing lift. Maximizing preload is something else u dont understand.
cardo0, bowtienut is correct. The more lifter preload you put into it the more it will hold the valve off the seat when it pumps up. The lifter pumps up to whatever preload you put it at. Preload is in essence the amount of added travel you'll put into the lifter (and pushrod, rocker, valve) when it pumps up.
Yes 93Z2871805, u are correct and i stand corrected. I was so P'd off with all the other stupid advice they were giving 97formula17 i didnt bother to look it up and got it backwards. Thx for your honesty without being malicious.
cardo
Those of us with EXPERIENCE have usually tried a handful of settings from near zero to near a full turn and NOT found constant adjustment to be necessary. Low preload can be louder but never found it to need adjustment.
This might be the first time I ever saw anyone suggest low preload would cause hydraulics to need repeated resetting.
This might be the first time I ever saw anyone suggest low preload would cause hydraulics to need repeated resetting.
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Joined: Jun 2007
Posts: 1,255
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From: centerville, ohio
don't "slot" the holes. not sure if you meant guide plates or heads but DON'T do either
as capricemgr notes, the ISKY's work better on the LT1 heads. they are a 2 part guide plate so you can set them up so each RR is dead nuts center on the valve tip. you may have to grind some of the ISKY plates if you need them closer together on some valves.
as capricemgr notes, the ISKY's work better on the LT1 heads. they are a 2 part guide plate so you can set them up so each RR is dead nuts center on the valve tip. you may have to grind some of the ISKY plates if you need them closer together on some valves.
TECH Veteran
Joined: Apr 2008
Posts: 4,985
Likes: 112
"deepening" a slot, assuming there was no adjustment by loosening RR stud to slide the plate back, would be OK. Side to side, no.
typically alignment problems are L-R, which is why the ISKY adjustable work so well on LT1 heads. The stud holes are also enlarged so there is a way to position them slightly front/back if needed.
typically alignment problems are L-R, which is why the ISKY adjustable work so well on LT1 heads. The stud holes are also enlarged so there is a way to position them slightly front/back if needed.