I've got a ported and polished 1.6 head up for sale. I have the valvetrain parts minus intake cam and it's unassembled right now so you're pretty much paying for the port work but I can send the head off for a valvejob and assembly if the buyer pays for the work. Asking 250+ shipping or can do $200 shipped if buyer sends a core in return

Intake







Exhaust

 

Who did the work on the head? Is there any bench test info showing what gains were made in flow?

 

Those ports are far from finished. Nice chop job on the valve guides.

 

I did the work on it and haven't had it flowed yet. If I still had a miata and I would have it flowed when the valvejob and all was done but I just sold mine

 

Why are you selling?

 

Because I sold my car 2 weeks ago and don't haven't anything to put it on anymore

 

That head needs a lot of work with paper scrolls before it is considered finished. You should have taped the mounting surfaces before porting. The mounting surfaces will have to be resurfaced in a big way.

It also looks like you removed alot of material from the floor of the port. Did you?

 

From what I've read taking material from the floor is a bad thing. It'll lower the intake speeds.

What experience do you have porting heads? I know you sold that built engine a bit ago, did you port that head with before and after results either flow benched or dyno'd?

How much for the valve job at your shop? Could that be done for 1mm+ over sized int/exh with the valves properly backcut, bowled, and no leaks? Could they also look at the head and see if it's even useable? How much extra would they charge to smooth and polish it up?

 

i bought the head off that motor, i dont think John was able to get the motor running, the head i got from john looks great! but im not a machinist, i might drop off at a head shop to check out the work and make sure all the ports are flowing the same

 

Well if you get it checked out anytime soon lemme know. Right now that tidbit didn't help much. If he didn't get it running and you have yet to try it out. We're still at square one scratching our heads.

 

im sorry but doesn't the exhaust side have to be close to mirror finish? It also looks like it needs new valve guides imo... good luck with sale.

 

Sorry I didn't respond yesterday it got busy at work and didn't have time to call the machine shop but yes they do machine work for OS valves and can check everything out it's just hard for me to make it there cause I live out in the country an hour from town. I stopped working on the head cause I don't have a car to use it on anymore

Only experience I have is this head and my first one so I'm no pro and can go back over it to finish smoothing everything over and polish up the exhaust side. As far as the bottom hurting flow I'm not sure and didn't get before and after numbers on the first head either. The machine shop has a CNC machine and a flowbench to check everything out. Thinking back from memory when I sent my first head in it was around $340 I believe for the machine work for larger valves, valve job, new valve seals, and to get everything checked and installed. Sorry if I missed any questions just ask them again.

 

You never remove large amounts of material from the floor of the port, just enough to remove the casting flash. All material should be removed from the sides and top. That is why a 99 head is so much better than a 94-97 head. The runner has been raised to straighten the path of the intake charge.

 

Thanks for the tip

 

I bought the bottom end, it's installed and have been happily boosting 13 psi the **** out of it, there is no quality issue... this head was intended to go on my car with that bottom end however certain financial issues arose and I cannot get it