Lets talk valves,
Thread Starter
TECH Fanatic
Joined: Dec 2005
Posts: 1,414
Likes: 28
Lets talk valves, Looking at a set of heads that have been worked over, wink wink. But they need valves, what are the best options? Go to the local parts store and buy stock replace, or buy stainless steel valves for a set of stock size 243 heads .
Thanks.
Thanks.
Your going to need a valve job done to height match and mate the new valves to the existing seats, so if I were you, I’d have my machine shop order the valves, and save time.
Thread Starter
TECH Fanatic
Joined: Dec 2005
Posts: 1,414
Likes: 28
Why do I need a valve job? Or what do you consider a valve job? Lapping the valves, and measuring the valve height, and adjusting it as needed? About 2.000" height.
Thanks.
Thanks.
Last edited by Stampede4ever; Jan 30, 2019 at 08:48 AM.
At the very least the new valves will need lapped or tapped. What do the seats look like? Could need cutting? Seats determine height up top. If their wacked up, that will need work. Can’t have your heights all over the place. Valve seals any good? Lots to consider here. Most shops will do you a nice valve job for a couple hundred or so. Money well spent.
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Re-lapping old valves already that have already been seated in the seats are okay as long as the guides are still good and your just cleaning things up and going back in with new valve seals. I've heard you can just lap in new valves to the seats of your heads but like everyone else says that's something left to the professionals who do this for a living. Just be sure your taking your stuff to some place reputable otherwise you may not be getting what you've paid for.
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Drop heads off at machine shop.
Ask them to stick valves in it and do a valve job. 5 angle or whichever multi angle they offer. There's a decent amount of power left on the table if you don't.
Give them money, take heads home.
Really is best to let the machine shop deal with it all, there will be several areas that need to be addressed like said above and a valve job is well worth the cost. Messing with valves yourself sometimes just isn't worth the headache vs the money it'll cost you to let the machine shop have it. If you have the equipment and experience go for it. If you want to learn go for it. Otherwise I'd just let those guys handle it.
As for valve options, keeping weight down is generally the first thing to consider when choosing from different valves.
Ask them to stick valves in it and do a valve job. 5 angle or whichever multi angle they offer. There's a decent amount of power left on the table if you don't.
Give them money, take heads home.
Really is best to let the machine shop deal with it all, there will be several areas that need to be addressed like said above and a valve job is well worth the cost. Messing with valves yourself sometimes just isn't worth the headache vs the money it'll cost you to let the machine shop have it. If you have the equipment and experience go for it. If you want to learn go for it. Otherwise I'd just let those guys handle it.
As for valve options, keeping weight down is generally the first thing to consider when choosing from different valves.
On The Tree
Joined: Oct 2004
Posts: 98
Likes: 11
From: in a large steel structure
Drop heads off at machine shop.
Ask them to stick valves in it and do a valve job. 5 angle or whichever multi angle they offer. There's a decent amount of power left on the table if you don't.
Give them money, take heads home.
Really is best to let the machine shop deal with it all, there will be several areas that need to be addressed like said above and a valve job is well worth the cost. Messing with valves yourself sometimes just isn't worth the headache vs the money it'll cost you to let the machine shop have it. If you have the equipment and experience go for it. If you want to learn go for it. Otherwise I'd just let those guys handle it.
As for valve options, keeping weight down is generally the first thing to consider when choosing from different valves.
Ask them to stick valves in it and do a valve job. 5 angle or whichever multi angle they offer. There's a decent amount of power left on the table if you don't.
Give them money, take heads home.
Really is best to let the machine shop deal with it all, there will be several areas that need to be addressed like said above and a valve job is well worth the cost. Messing with valves yourself sometimes just isn't worth the headache vs the money it'll cost you to let the machine shop have it. If you have the equipment and experience go for it. If you want to learn go for it. Otherwise I'd just let those guys handle it.
As for valve options, keeping weight down is generally the first thing to consider when choosing from different valves.
This! a set of C5 Z06 valves are an option.... or some LS3 valves that are "turned down" or Ferrea, or Manley or Victory one.... just depends on your budget...
OP, let me know if you want to buy some C5 z06 valves in excellent shape before I put them up for sale on here. I was going to use them on my build, but am going with PRC 225s. They probably won't be much more than what a shop charges you for something heavier.
Thread Starter
TECH Fanatic
Joined: Dec 2005
Posts: 1,414
Likes: 28
Drop heads off at machine shop.
Ask them to stick valves in it and do a valve job. 5 angle or whichever multi angle they offer. There's a decent amount of power left on the table if you don't.
Give them money, take heads home.
Really is best to let the machine shop deal with it all, there will be several areas that need to be addressed like said above and a valve job is well worth the cost. Messing with valves yourself sometimes just isn't worth the headache vs the money it'll cost you to let the machine shop have it. If you have the equipment and experience go for it. If you want to learn go for it. Otherwise I'd just let those guys handle it.
As for valve options, keeping weight down is generally the first thing to consider when choosing from different valves.
Ask them to stick valves in it and do a valve job. 5 angle or whichever multi angle they offer. There's a decent amount of power left on the table if you don't.
Give them money, take heads home.
Really is best to let the machine shop deal with it all, there will be several areas that need to be addressed like said above and a valve job is well worth the cost. Messing with valves yourself sometimes just isn't worth the headache vs the money it'll cost you to let the machine shop have it. If you have the equipment and experience go for it. If you want to learn go for it. Otherwise I'd just let those guys handle it.
As for valve options, keeping weight down is generally the first thing to consider when choosing from different valves.
So what are the best angles to use?
Thanks.
So you have a Serdi valve seat cutting machine or something similar? You could potentially do this on a bridge port mill but it will take a lot of time to setup. Then you'll need to make your seat cutter and pilot
For what you are doing, a valve job doesn't have to be that complicated. A competent machinist should be able to cut the valve job and if needed, grind the tips of the valves to get the stem protrusion back to factory specs. With a higher lift cam, personally I would rather the stem protrusion be a little longer to make up for the increase in rocker arm sweep.
There really isn't a "best" valve job, it just comes down to application. The most basic profile is a 30 degree top cut, a 45 degree seat cut, and a 60 degree bottom cut. It's based on an old theory that air doesn't like to make turns sharper than 15 degrees, but in reality, sharper angles can and have made more power. Google some of Greg Good's posts from Speedtalk. You might have to search way back, but he has recommended a couple profiles that work really well on the LS cylinder heads.
I'd answer your question about the angles but KCS is light years ahead of me in the machining area. I know i've had a multi angle cut done before and noticed a considerable amount of power from it, then bent the valves on that motor and told them just slap in new valves and the car went back to running the same as before I had the multi angle done. I don't know what the angles were, they just said it was a 5 angle.
Thread Starter
TECH Fanatic
Joined: Dec 2005
Posts: 1,414
Likes: 28
It will be awhile till I have the time to start this project, but I will take the time to learn how to do it in the mean time. I will be doing this on a Bridge Port, I think I made a fixture to hold the heads for a different project I did, have to see. So, I don't have to tilt the head.
How are the EngineTech valves?
Stampede.
How are the EngineTech valves?
Stampede.
I'm all about doing it yourself.
These guys sell a lot of the tools you might need - https://www.cylinderheadsupply.com/nestdicubo.html
These guys sell a lot of the tools you might need - https://www.cylinderheadsupply.com/nestdicubo.html
I got a set of intake valves from WS6store that are pretty good for the money. They do not have a backcut, but for the $90 I paid for them, it was well worth it. I used to use REV and Ferrea, which are nice valves, but I think they're over $120 for a set of intake valves the last I checked. Also, take a look at Trickflow valves. I order a set of TFS exhaust valves from Summit Racing and they came in a TFS box with the TFS part number, but the valves were packaged in Ferrea packaging. I think they were a little cheaper than the normal Ferrea part numbers too.