Going rate for 7M head porting these days?

[InFrnt0fU]

I was hoping to get some info to compare against pricing I've heard. Mainly a full exhaust/intake/valve porting for a high performance build with the minimum HP goal of 600hp.

Do many people in the community consider cylinder head porting as part of the high HP builds?

If anyone wants to chime in at what they would pay for a quality port job, please do so.

Thanks for the input.
rm.

 

[gofastgeorge]

IMO, full porting isn't really needed for your goals.
Removing noticeable casting flaws,
and matching the bottom of the seats to the surrounding port surface is about all that is required.
If for nothing else other than get flow to each cylinder equal.
(I have noticed on many 7M heads, the seat/port mismatch is seldom the same across all ports)
And much of the mismatch between the seats & surrounding port surface goes away when larger valves are installed.

A lot of work around the stem area would help on an 800+ hp, or a NA build.
But that is best left to someone with a flow bench, and 4-valve head experience.

 

[92nsx]

P&P only is $350-450 ish. But you might as well get your whole head rebuilt at the same time.

 

[gofastgeorge]

But you might as well get your whole head rebuilt at the same time.

Yup, the full deal,
Surfaced, chambers cc's matched, and valve stems checked.
While your at it, have them cut out those protrusions in the chamber that are between the valves.
The factory Group-A head, came without them, as do the newer1J/2J heads.
They restrict flow around the valve heads.

What is the going rate for having big valves installed (besides the cost of the valves) these days?
I haven't followed it, since I have done my own valves for years now.

 

[suprarich]

The going rate for installing oversize valves, new seats, seals, springs and retainers is 350 to 400.00

Port jobs are usually done on a time and material basis, you can spend anywhere from 250 to 1200.00 just on the porting alone. About 500 would get you a really nice high end street/strip port job.

But as George already stated, for your power goals, just a cleanup of the casting is more than enough. I can think of a good handfull of 7m's making 650-750 on a fresh stock head with stock valves and stock cams.

 

[92nsx]

<---- Total head port & polish, rebuild, cut valves, straighten, install new parts = $1930

 

[airhead04]

So any idea on just new hardware install and a nice cleaning might be?

edit: also need it ready for mhg.

 

[radiod]

I did my own cleaning up with a dremel like tool and some carbide burrs. I spent about 4 or 5 hours on it, came out really nice and I'm quite pleased with it. Other thing I did with my head was new valve springs, so I just stuck some of the Comp Cams 975 springs in. Cheap and relatively easy to get in.

 

[InFrnt0fU]

Thanks for your responses and advice. If anybody else can chime in about pricing, what their head work entailed and cost them...would be very helpful. The guy who did the work on my head is looking to possibly become a vendor. I'm just trying to help him out with some of the leg work as much as I can as he has helped me TREMENDOUSLY with my build.

Thanks again..rm.

 

[radiod]

Resurfacing head for metal head gasket - $90
General time labor for dissassemble/reassemble of head including machining seats to fit Comp Cams 975 springs & install new valve seals - 5 hrs @ $80/hr = $400
Polish cams - $60
Shim adjustments - 2 hrs @ $80/hr = $160

Those are all the relevant parts off my bill that I got a couple months ago. This is all canadian dollars though, and machine shop rates can vary quite a bit from region to region.

 

[IJ.]

Resurfacing head for metal head gasket - $90
General time labor for dissassemble/reassemble of head including machining seats to fit Comp Cams 975 springs & install new valve seals - 5 hrs @ $80/hr = $400
Polish cams - $60
Shim adjustments - 2 hrs @ $80/hr = $160

Those are all the relevant parts off my bill that I got a couple months ago. This is all canadian dollars though, and machine shop rates can vary quite a bit from region to region.

So $3.90 or some shiny beads in real money??

I had $7k Aud in my old 7M head, it's easy to spend money on 24v heads.

 

[MRSUPRA]

I had my head rebuilt with BC springs/retainers, ferrea 1mm oversized valves, 5 angle valve job and a street port for $1800.

 

[Hmong_1G]

I vote SWAIN coatings and polishing manufactures cast flaws ( roughness). Last I heard 7M heads are GREAT and that 1grand could be spent on something else.

 

[airhead04]

So $3.90 or some shiny beads in real money??

I had $7k Aud in my old 7M head, it's easy to spend money on 24v heads.

Thats like 6500$ usd. Why so much IJ

 

[IJ.]

Brand new casting, hard face welded Cams full Ferrea valve train, Solid buckets, Port job and so on, that with the weak Aussie $ at the time raped me.

 

[airhead04]

Ah, gotcha. Im hoping to graze by with only spending about 1k on my head.

my stepdad wants me to go 2j, but i dont have that kind of money right now...so maybe later. lol

 

[Halsupramk3]

here are some pics of the casting and valve seat ridge under the seat. i ported my head myself and it was not that hard with a lot of research on what to and what not to cut. just getting rid of that bump under the seat and smoothing out all the rough casting really helps flow. i had mine flow tested and it was all within 2% flow.

the other pic is the ridges shrowding the valves. the areas are marked in red. i cut some of this out but not completely. i also had the chambers cced. they were within .5 cc of each other afterwards.

i also ported the exhaust and intake ports. i made sure the intake ports got just a little bit smaller as it flowed into the valve as to try to keep up velocity. the port is already that way. i could have removed more material from the center partition i think.

i will also post some pics of my Swain tech coatings. i think i have a more involved thread in supraforums that i will try to find the link to.

 

[Halsupramk3]

Here is the finished head. Swain Tech coated the chamber, exhaust ports and valves. and intake valve surface in the chamber. also the piston skirts had PC-9 coating and the piston top with Gold coat. so the entire chamber is coated to keep heat out of the engine. this was a few years back and was not too cheap then but cost is higher now. i should have installed 1mm larger valves too but did not have the cash.

when i do another head it would be money better spent to install 1mm oversize valves, remove any casting flash under the valve seat, port the chamber to smooth it out and open it up alittle as mentioned in my thread, then coat everything. of course 264 cams and gears. So then the head cost more than the rest of the car.

here is the link to my head info after i did the work.

http://www.supraforums.com/forum/showthread.php?t=270783

 

[Zumtizzle]

Now a days,

Techline Coatings > Swain tech.

I wouldn't bother getting the valves or chamber coated; but thats my opinion.

 

[Van]

Flat rate: $55 USD/Hr at M&B Cylinder Heads :burnoutortland Oregon. Van