Max lift on stock valve springs?
10-16-2007, 07:05 PM
#1
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Join Date: May 2007
Posts: 273
Max lift on stock valve springs?
I got a cam i would love to use but its border line on stock valve train(125k miles).
Max lift w/ stock 1.5's is 503
I could chance it and save over $500+ , after springs,retainers,locators,locks,machineing,RR's,v alvejob,etc.....
My question is how much lift can the stockers handle?
Real world experience please.
Max lift w/ stock 1.5's is 503
I could chance it and save over $500+ , after springs,retainers,locators,locks,machineing,RR's,v alvejob,etc.....
My question is how much lift can the stockers handle?
Real world experience please.
10-16-2007, 08:15 PM
#4
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Join Date: Nov 2006
Location: Roanoke VA
Posts: 334
RR's, springs, retainers, locators, shims and locks are all ya need. Head work will help, but you don't need it if your trying to stay cheap. If you do RR's you could go with a 1.6:1 ratio and get 0.537/0.544 vs .0503/0.510 with the 1.5:1 rockers. But make sure you get springs that can take that lift. Just a thought.
10-16-2007, 08:15 PM
#5
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Join Date: Oct 2006
Location: Goochland, Va.
Posts: 4,974
I did it long ago.....a hot cam on stock springs and rockers.
It lasted along time and the car ran good. But when I checked them it was a ticking time bomb.
Isky makes some good springs that are stock diameter and you can reuse your retainers and locators. Look at circle track stuff alot of classes have to run a stock diameter spring. The stock LT1 retainers are decent IMO......for something mild anyway.
I have done all this stuff.....done budget stuff and stock style stuff........I learned that if there is one place you need to make wise investment in a motor its the valetrain.
A high quality pushrod may also have small gains in it by reducing flex...its the little things like that , that add up and give you a good combo
It lasted along time and the car ran good. But when I checked them it was a ticking time bomb.
Isky makes some good springs that are stock diameter and you can reuse your retainers and locators. Look at circle track stuff alot of classes have to run a stock diameter spring. The stock LT1 retainers are decent IMO......for something mild anyway.
I have done all this stuff.....done budget stuff and stock style stuff........I learned that if there is one place you need to make wise investment in a motor its the valetrain.
A high quality pushrod may also have small gains in it by reducing flex...its the little things like that , that add up and give you a good combo
10-16-2007, 08:20 PM
#6
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Join Date: Jan 2005
Location: Moore Oklahoma
Posts: 1,388
The springs can be changed-out without too much trouble with the heads on. Also, there are several brands of springs that aren't too expensive, but can handle the lift (Comp beehive 918s). Don't forget to change the valve stem seals.
WD
WD
10-16-2007, 08:37 PM
#7
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Join Date: Oct 2004
Location: las vegas
Posts: 1,130
My question is how much lift can the stockers handle?
Real world experience please.
the stock springs barely handle the stock cam with stock rockers a cam of any larger lift and duration may cause spring failure possibly drop a valve.
safe bet is a set of springs.
Real world experience please.
the stock springs barely handle the stock cam with stock rockers a cam of any larger lift and duration may cause spring failure possibly drop a valve.
safe bet is a set of springs.
10-17-2007, 07:30 AM
#10
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Location: Moore Oklahoma
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10-17-2007, 08:07 AM
#11
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Join Date: Jul 1999
Location: Six Mile, SC, USA
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BTW- I got a set of the 1518s sitting here NIB I will ship for $230.
10-17-2007, 08:56 AM
#12
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Location: Moore Oklahoma
Posts: 1,388
I had actually checked your web-site earlier this week for the PAC-1518s and saw your $325.00 list price. So yes, the $230 shipped for “NIB” PAC-1518s sounds great! I’ll give you a call when I get some time this week.
WD
10-17-2007, 09:28 AM
#13
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Join Date: Jul 1999
Location: Six Mile, SC, USA
Posts: 2,054
Yep, if you need the Ti retainers let me know too.
Thanks!
Thanks!
I'll need the PAC-1518s, as I'm running very near .600 lift at the valve. And, I’m wanting an upgrade spring over Comp 918s beehives I’m currently running. I also plan to add titanium retainers when I change-out the springs.
I had actually checked your web-site earlier this week for the PAC-1518s and saw your $325.00 list price. So yes, the $230 shipped for “NIB” PAC-1518s sounds great! I’ll give you a call when I get some time this week.
WD
I had actually checked your web-site earlier this week for the PAC-1518s and saw your $325.00 list price. So yes, the $230 shipped for “NIB” PAC-1518s sounds great! I’ll give you a call when I get some time this week.
WD
