Valves and Valve jobs.

[1g8420a]

I am going to replace all of my valves on my 420A and I was wondering do you have to have a valve job done at the machine shop to seat them. I Know I need to lap them on. any ideas? thanks guys.

 

[bryanwheat]

Kind of depends on the condition of the seats. If they aren't pitted i would lap them with fine compound and see how wide your contact surface is.

 

[powellds2]

If you decide to do the work yourself (which isn't hard if all you need to do is lap them) there's a guy on 2gnt that sells a valve spring compressor that's pretty cool.. 2GNT.com Forums - Viewing topic - My valve spring compreessor tool

 

[silvreclips]

It only cost me about $40 at the machine shop to have the valves done and the head cleaned. Not worth all the work if you ask me.

 

[1g8420a]

It only cost me about $40 at the machine shop to have the valves done and the head cleaned. Not worth all the work if you ask me.

Ya I took My Head to the local machine shop and had a cleaning done for 45 bucks but, He said when I have the new valves I need to have a 3 angle machine work to the valve to get a correct seal and he wanted $170

 

[bryanwheat]

Yeah, most machine shops are charging between 150 and 200 for a valve job these days. I got charged 170 just to do intake valve seats and valves recently. Why are you replacing the valves, are yours bent?

 

[1g8420a]

Yeah, most machine shops are charging between 150 and 200 for a valve job these days. I got charged 170 just to do intake valve seats and valves recently. Why are you replacing the valves, are yours bent?

My Valves were actually in good shape but, I am a Noob and did not put them in order and put them in a baggie. I have No idea which is intake or exhaust. I did buy new springs and retainers tho.. I'd Prefer not to replace them any Idea what i can do to put them back in?

 

[bryanwheat]

It isn't a problem at all to reuse them. Just measure, the intake valves are a tad bigger than the exhaust. I've got a bucket of used valves that i use when i build a head. There is absolutely no need for new valves in this situation. You are wasting money.

 

[Oneslowgs-t]

On hondas the intake valve is bigger then the exhaust valve or viseversa, I always forget.
Also the exhaust valves should have a little carbon build up. Not sure if dsm's are the same.
Just my experience

It isn't a problem at all to reuse them. Just measure, the intake valves are a tad bigger than the exhaust. I've got a bucket of used valves that i use when i build a head. There is absolutely no need for new valves in this situation. You are wasting money.

Phones to slow

 

[1g8420a]

It isn't a problem at all to reuse them. Just measure, the intake valves are a tad bigger than the exhaust. I've got a bucket of used valves that i use when i build a head. There is absolutely no need for new valves in this situation. You are wasting money.

Ok. So is the stem that should be larger or the surface area of the bottom of the valve? measure with a Dial Caliper right? I appreciate all of you advice I still wanna save money where I can for now.

 

[bullettdsm]

Ok. So is the stem that should be larger or the surface area of the bottom of the valve? measure with a Dial Caliper right? I appreciate all of you advice I still wanna save money where I can for now.

The valve head is larger (or smaller depending on which valve you are talking about, ). No need to measure, just match them up. It will be obvious which is smaller and which is larger.

MB