243 Valve Stem Lengths
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Teching In
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243 Valve Stem Lengths Thanks for your help in advance.
I am trying to figure out what valve stem lengths I need on my valves to keep the springs from binding with the cam I am choosing. After market springs and valves obviously.
I was hoping someone could point me in the direction of the right formulas to figure this out or information on this subject.
Thanks
Race LS
I am trying to figure out what valve stem lengths I need on my valves to keep the springs from binding with the cam I am choosing. After market springs and valves obviously.
I was hoping someone could point me in the direction of the right formulas to figure this out or information on this subject.
Thanks
Race LS
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Going to go bigger probably. Most likely 2.08/1.60. Also, I am not sure the stock valves are long enough to handle the springs I need without binding. Hence my question.
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Not sure I follow. Most of the LS springs have a coil bind height that are very close to each other, there is not a huge difference. What are the springs you are planning on using? Also, if you get the LS6 valves you won't need nearly as much valve spring force.
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I think what he is meaning is the installed height of the valvetrain.. Meaning he may be running a larger cam then most springs are good for? Can you cut the spring pockets to get more of a install height or does he need a longer stem.. how can he go about checking for this..
I smell decades outdated thinking and assumptions. The LS variants can run a lot of lift before longer stems become a concern and blindly trying to put the biggest valve possible is not terribly productive.
IF the heads are fully reshaped to take advantage of larger valves then it might be worthwhile but if he were having that done the shop doing the work would know what valves to buy.
IF the heads are fully reshaped to take advantage of larger valves then it might be worthwhile but if he were having that done the shop doing the work would know what valves to buy.
If you contact one of the vendors, they can help you out with a good package.
Long story short, the stock valve sizes flow very well, and there are multiple spring packages from different vendors that will let you run ~.600" lift cams.
Long story short, the stock valve sizes flow very well, and there are multiple spring packages from different vendors that will let you run ~.600" lift cams.
How much lift are you wanting to run?
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Kcs thank you that helped. Also, I will call a vendor.
No details have been given for a reason. I don't like to give out details. I asked for the formula or readings on the subject for that reason.
Thanks
No details have been given for a reason. I don't like to give out details. I asked for the formula or readings on the subject for that reason.
Thanks
....... No offense man but without details how can we help you? No ones going to steal your setup. It's already been said most ls springs and valves will set up around the same height. So the question now becomes what cam are you thinking then we can recommend springs
Say you want to run .800" lift on the stock 243 casting. Most springs are for a 1.8" installed height and go into coilbind at around 1.050". Factor in clearance from coilbind and you're limited to about .700" lift. Personally, I would look at what springs are on the market that would support .800" lift and fit in the spring pocket of the LS head and use the recommended installed height to determine what OAL valve length would be required. Say you find something that will work and has a 1.9" installed height. That's about .100" taller, so the .100" longer valve, with the same .160" tip length, would give you the taller installed height.
I hope you also understand that as you get further and further away from the original design, there are more things that need to be checked and corrected to make it all work. That's why a very sharp valvetrain guy would be the difference between making it all work and making it all blow up.
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Redbird that is why I asked how to figure it out and not what to purchase. I am not worried about people stealing my set up and worry about people knowing it when I go to race them.
KCS thanks that is a big help. I completely understand things change with aftermarket parts.
KCS thanks that is a big help. I completely understand things change with aftermarket parts.
