valve job machine shop asked me about

[BrandonW]

this might be a better spot for this then in general

Valve Job 6 cyl recessed springs: $xx

What the valve job consists of is: hot tanking, valves removed, carbon cleaned, cut seats/valves, clean and check springs/guides, check for cracks, pressure test, install new valve seals.

If you don't do the entire valve job, installing the valve seals alone will be $xx

maybe some imput on this is what im looking for, im doing a mild build looking for 300whp and then later 350-370 whp

is all that needed? should it be done? what should i know saying yes or no to this

 

[suprarich]

It is needed if your head needs a valve job. But is not needed for for your hp goal.

 

[BrandonW]

It is needed if your head needs a valve job.

could you explain a little more on this?

or is that something when trying for higher horse power, like trying to get the most flow out of the head?

should i replace something like the springs? or are they ok?

it all sounds good but the machine work is starting to get pricey

 

[suprarich]

A valve job is a rebuilding process, not a performance upgrade. If the valves and seats are worn out then you need a valve job. The springs can be tested to see if they are still in spec.

 

[IJ.]

A Valve job on a 24v head is always going to be a pita due to the sheer number of operations required to do it properly, cheap job are usually so half assed you end up with junk so it's well worth spending some extra $ at a trusted shop.

Do you trust this shop to NOT lie to you?

 

[BrandonW]

Do you trust this shop to NOT lie to you?

i see

well i have not delt with them personally but jon the guy doing all the work except machine work deals with them all the time and says they are great and i trust him, i'll be going there on thursday to chat about the progress and such

thanks for the imput

 

[Weeves]

I suggest going ahead with the valve job. My 7M is being rebuilt right now and it was suggested I get a valve job done.... they found a burnt and chipped exhaust valve in the process. It's worth it since the head is already off.

 

[radiod]

Like suprarich has already said, it's not something you need to do for your power requirements. If you have problems with burning oil that's leaing through your valve seals then yes, probably a good idea if you're going to be building towards a 700hp engine. The only other reason you'd get it done is if you're experiencing loss of compression due to valves that aren't seating properly in the head. A compression test will tell you if you're low on compression, a leak down test will tell you more specifically what is leaking where. Last on the list is hot tanking/checking for cracks/pressure testing. If you have a cracked head, you'd probably know something is wrong by either loss of compression, oil, coolant, and/or all of the above.

If you have none of those problems, don't mess with it.

If you're concerned about flow through the head, there are other areas you look at. Bigger cams can give you more valve lift (open the valves further) to create more flow into the comubstion chamber. That's typically the most common thing to do to increase flow. You can also go in to porting and polishing which is taking out the casting defects and/or enlarging the intake and exhaust ports in the head.

If you do end up taking the head off though and you have a high mileage engine, I would recommend doing the springs and valve seals at the very least. Seals are next to nothing, and a full set of springs is about $120 from Toyota if I remember correctly.

EDIT: Didn't realize the head was already off. They should be able to do a quick visual check on the valves/seats to see if anything's messed for much less cost to you. If there is a problem, fix it. If there isn't...well...there's nothing to fix.

 

[Poodles]

Valve seals are absolutely necessary.

Pressure and leak testing is required. Cleaning it all and removing carbon is important, and usually relapping the valves in.

There are some cheap springs for our cars as well, I'm sure Rich remembers (I have em, forgot the brand/part number).

Personally, if you trust the engine builder and machine shop, have them inspect it all and see what they say...

 

[BrandonW]

while this thread is here let me ask this

Deck block
Bore and hone 6 cyl (im doing a .020 over from stock)
Clean block
Resurface 6 cyl head
Valve Job 6 cyl recessed springs: hot tanking, valves removed, carbon cleaned, cut seats/valves, clean and check springs/guides, check for cracks, pressure test, install new valve seals.

what would you guys say a ballpark price range this should all cost

i'll check around for some springs too and see what i come up with

 

[mkiii222]

Not sure about the block work, but I got a local quote for a complete head job a few months back for $425 (leaky water pump was causing bhg like overheating and loss of coolant).

This included a complete valve job and resurfacing using my new seals and springs.


And stealing a link that jdub posted a while back:
http://www.sipracingmailorder.com/servlet/the-7mgte-7mge-Toyota-Supra/Categories

Comp Cams springs ($64) and viton seals ($21) for $85 would have brought my head to like new condition for just over $500.

 

[BrandonW]

thanks and i already have the seals already since they came in the stone gasket set

maybe i'll look into these springs

 

[Doward]

CCA-975s, IIRC. I've got a set in my head

 

[radiod]

I'm getting all the head work that you're getting and I'm expecting to spend about $500 - $600 + tax. I'm going to be doing the comp cams 975 (chev big block inner) spring mod myself, which comes out to be rediculously cheap, but that's up to you. Here's a link to a thread discussing it:

http://www.supramania.com/forums/showthread.php?t=55363

 

[BrandonW]

just to make sure there is not modification for those springs correct? they just drop right in sore of speak?

 

[NewWestSupras]

they are drop-in.

 

[Hmong_1G]

CCA-975s, IIRC. I've got a set in my head

SO I would buy 2 sets of the same? No difference on intake or exhaust side? This is great news.

 

[Poodles]

Springs won't use the lower spring seats and they're a bit of a tight fit (machine shop tried to say they were wrong, they're not)

 

[BrandonW]

so you just don't use the lower spring seats? and thats ok?

 

[radiod]

Now I'm curious...I haven't heard anything like that before and I'm about to put them in my own head :eek3:.