I'm rebuilding my engine and about to send the head away to get it machined. What kind of things should I make sure they do, and how much do you think it will cost? I got quotes anywhere from $250-$750.
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Please be more descriptive in your objective for this head. Are you rebuilding the head for performance or just to recondition it to "like-new" stock specs?
Recondition to new-stock
- resurface/deck the head (mating surface)
- valve job
- new valve stem seals
- have them check your valve springs for compression (replace any, if needed)
Performance (do everything listed above, plus..)
- can do a more complex valve job (more angles/polishes, etc)
- upgrade valvetrain (valve springs, retainers, valve locks)...typically if you're running a higher RPM cam or will be in the higher RPMs than what stock can do
- port & polish work (price varies depending on your source & the quality of their work)
- milling the head (added compression)
- chamber work (added compression, more efficient burn, better air flow) -
Thanks for the input.
Sorry, should have been more clear about what I meant.
Well I blew a chunk out of one of my exhaust valves, so I pretty much have to rebuild the engine. Right now seeing as I have everything apart I would like to do some performance upgrades without getting too caried away(don't want to spend too much). Nows the time to do any work I want done.
So I'm getting all new valves, that much I do know.
How much would getting a more complex valve job cost? Would that just make the air flow more smoothly in?
Also if I were to up the compression would I need to do any other work to the engine? How much compression can a stock block handle?Comment
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How did you blow a chunk out of an exhaust valve? Did you take care of this issue and prevent it from happening again? If not, I would first take care of this issue before anything.Originally posted by 90AccordEXR
If you're looking for a lower-end performance upgrade regarding the head. I'd personally do the following:
- new valves (aded...only because you're set on doing this)
- standard 3-angle valve job
- new valve stem seals
- have all valve springs checked for compression (replace any if necessary)
- resurface/deck the head and/or mill it like .020" (up to you)
- send out your stock cam for a Delta regrind (www.deltacam.com) < good bang for buck
- a more complex valve job is not worth the money for your budgetComment
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thanks for the help.
I'm pretty sure the old valve just burnt through. My valve stem seals were leaking before. I put some oil sealant stuff in, which sucked, maybe that had something to do with it.
As for replacing the valves, I'm pretty sure I should do this as one of them already burnt through, and for the $120 its gonna cost me its probably worth it.
How much compression will milling the head to .020" result in? (is there a formula or something).
I am going to get the cam reground, (would you recomend 272 grind?) but I live in Canada
I'm also going to get my throttle body bored out a little bit.Comment
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The F22 head I'm having done up right now has .020" mill and I predicted like a 0.5 compression increase.Originally posted by 90AccordEXRthanks for the help.
I'm pretty sure the old valve just burnt through. My valve stem seals were leaking before. I put some oil sealant stuff in, which sucked, maybe that had something to do with it.
As for replacing the valves, I'm pretty sure I should do this as one of them already burnt through, and for the $120 its gonna cost me its probably worth it.
How much compression will milling the head to .020" result in? (is there a formula or something).
I am going to get the cam reground, (would you recomend 272 grind?) but I live in Canada
I'm also going to get my throttle body bored out a little bit.Comment
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What octane level gas would you recomend running if I did that? I read somewhere that unless you're running a lot of mods, higher octane gas will actually not be as good, as it requires higher compression to burn better??Comment
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