Vortec350ss

iTrader: (20)

so I'm about to tackle a valve spring job on the truck.

I need stiffer springs, and I figured why I was at it I would replace the valve seals as well. This is all going to happen on my AFR's.

I ordered some PAC 1207's with the appropriate Ti retainers, and spring locaters, along with AFR valve seals.

I have never changed a dual spring before so I have a few questions. I attached pics to help describe what I am looking at.

My main concern is how the valve seal works with the spring locater, and what keeps the seal in place with this base spring guide?

If you guys could just take a look at these parts and toss in your $.02 i'd really appreciate it.

Ferocity02

iTrader: (59)

The seal presses onto the valve guide and stays in place. Nothing holds it here other than a tight fit. You will need a socket and a hammer to tap the seals on. The "hat" style seals with built-in spring seats will not work with springs that require new seats, such as yours. They will only work with stock springs or stock replacement beehive springs like 918's or 1218's that can use the stock seat. Here is a pic of the "hat" style.

Vortec350ss

iTrader: (20)

Damn... I was afraid of that. This is going to be a really tight fit... I didn't even think they would fit honestly.

Vortec350ss

iTrader: (20)

Is it best to punch it down through the top pushing the base of the seal down, or up through the bottom pushing the top of the seal almost all the way through?

Ferocity02

iTrader: (59)

Not sure what you're asking. The seal you have pictures is the right one for you. You put the seat in first, then tap the seal onto the guide, then put spring and retainer in.

Vortec350ss

iTrader: (20)

ok wait I'm sorry... i read your first response wrong. when i read valve guide I was thinking the spring seat. I thought you meant the valve seal needed to be pressed into the spring seat... I was thinking good god this is gonna suck.

Makes more sense now. Sorry about the confusion.

Vortec350ss

iTrader: (20)

alright I'm digging this back up rather than starting a new thread.

The truck is going in a different direction now and these springs/seals will be going on a set of stock 317's.

The 317's are currently off the truck and I'm gonna be adding boost. They have about 85k stock miles on them so I want to make sure everything is perfect. What is anything should I check for, or have a machine/speed shop look for? Will the valve guides need to be checked or am I good to assume those are fine? If they are nothing to worry about them I plan on replacing the springs myself and just having them pressure checked and decked after i swap them. Is it a good idea to have them assemble everything? My cam comes nowhere near the max lift these springs can handle, so I don't think coil bind is an issue at all.

Thanks for the help!

silverado2003

85 K miles, guides should be ok, just take them to a machine shop and have them checked. Might just need a clean up valve job ?

As for the springs, If you think the springs will be too much, why not go with some Comp 918's ? I ran those on a 231/237 .598 lift and had 0 problems.

Vortec350ss

iTrader: (20)

I'm not worried about the springs being too much. I am just worried that there will need to be work done to the heads that involves pulling the springs off after I install them. While I don't want to skimp on stuff that should or needs to be done, I DON'T want to dump a lot of money into these stock heads.

Vortec350ss

iTrader: (20)

Alright one last question. The spring seat in that picture is specific to AFR heads and they are too big for the stockers. What part do I need to install these on the stock heads?