PTV and pushrod length confused on the order.
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Teching In
Joined: Nov 2018
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PTV and pushrod length confused on the order. I'm running a stock junkyard lq4 with new pac racing springs that's it in terms of internal mods, as its being turbocharged.
I'm searching this forum and I ended up more confused than when I started regarding valvetrain setup.
I am refreshing the rods, trunion kit, springs, lifters, ls9 gasket
1. What is the proper order of operations on what gets measured and done first? I dont want to have my heads setup only to pull them apart for check springs
2. I do not have the old head hardware/head gasket, should I just buy cheap bolts/gasket so I dont ruin my ls9 gasket and arp studs?
Is there a guide out there that anyone can recommend? Looking through the old posts and the replies just add to the confusion.
Sorry I'm new to all of this, hence why I'm using a running junkyard motor and not a $5,000 custom longblock
thank you
I'm searching this forum and I ended up more confused than when I started regarding valvetrain setup.
I am refreshing the rods, trunion kit, springs, lifters, ls9 gasket
1. What is the proper order of operations on what gets measured and done first? I dont want to have my heads setup only to pull them apart for check springs
2. I do not have the old head hardware/head gasket, should I just buy cheap bolts/gasket so I dont ruin my ls9 gasket and arp studs?
Is there a guide out there that anyone can recommend? Looking through the old posts and the replies just add to the confusion.
Sorry I'm new to all of this, hence why I'm using a running junkyard motor and not a $5,000 custom longblock
thank you
Last edited by Pestilence; Dec 6, 2018 at 04:18 PM.
Teching In
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From: Central Ohio
Thread Starter
Teching In
Joined: Nov 2018
Posts: 23
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It's always a good idea to measure but if you're going back with all stock spec parts then it's all already measured. It was measured when the OEM designed it.
For the springs, ask who you buy them from on the setup and if they will need any shims. They shouldn't. Should be a straight forward install.
As far as check springs. You can install them with the heads still on the same way you do valve springs with the heads on.
Let us know if you have any more questions man.
For the springs, ask who you buy them from on the setup and if they will need any shims. They shouldn't. Should be a straight forward install.
As far as check springs. You can install them with the heads still on the same way you do valve springs with the heads on.
Let us know if you have any more questions man.
Thread Starter
Teching In
Joined: Nov 2018
Posts: 23
Likes: 0
It's always a good idea to measure but if you're going back with all stock spec parts then it's all already measured. It was measured when the OEM designed it.
For the springs, ask who you buy them from on the setup and if they will need any shims. They shouldn't. Should be a straight forward install.
As far as check springs. You can install them with the heads still on the same way you do valve springs with the heads on.
Let us know if you have any more questions man.
For the springs, ask who you buy them from on the setup and if they will need any shims. They shouldn't. Should be a straight forward install.
As far as check springs. You can install them with the heads still on the same way you do valve springs with the heads on.
Let us know if you have any more questions man.
Appreciate it.
I guess I was confusing the process a little bit. I had planned on having the heads looked over, new springs/valves but I was like wait, I might be skipping ahead a tad, if I have to put check springs in.
I was reading I would need to check spring pressure of the new pac springs as well and it became like a tsunami of information and for a second there was like what did I get myself into lol.
You should always measure. But when a certain setup is done many times over and in known to have no issues it's safe to say you'll be safe. If you're using a stock cam and lifters and you haven't milled heads or anything else then stock length pushrods will be fine, since that's what came out and they worked fine.
As for the springs, you should check for proper pressures but those springs have been used so many times the spring manufacturer or one of the site sponsors that sells them should be able to tell you right off how to set them up.
If you were doing a large cam, or cam and heads, or cam heads new lifters etc etc then you absolutely should measure.
You're essentially doing a stock setup so go with stock stuff and you're good. Just double check with someone on the springs or take the heads to a machine shop and have them install and check the spring pressures and slap the heads on when they're done. You really should take the heads to the machine shop anyway to have them inspected, valves checked for any leaking, and decks checked for surface flatness.
As for the springs, you should check for proper pressures but those springs have been used so many times the spring manufacturer or one of the site sponsors that sells them should be able to tell you right off how to set them up.
If you were doing a large cam, or cam and heads, or cam heads new lifters etc etc then you absolutely should measure.
You're essentially doing a stock setup so go with stock stuff and you're good. Just double check with someone on the springs or take the heads to a machine shop and have them install and check the spring pressures and slap the heads on when they're done. You really should take the heads to the machine shop anyway to have them inspected, valves checked for any leaking, and decks checked for surface flatness.
