Port and Polish

[Grandmarchris]

I wanna port and poslish my non pi heads instead of getting the swap...Does anybody know how much of a gain I would get by doing so?

[p71towny]

Not as much as a swap. I would assume a good 50, but hell I dunno.

[turbo2256b]

The non PI heads ported from my shop will flow more than PI heads. I sugest a PI intake with the non PI heads. Power added is like a 100 shot of NOS is the best way to describe the potential. Talk to someone that has Renigade Racing heads on the car we do the heads for Renigade. You will need possibly othere upgrades to get the full effect. A heads up dont waist money on hotter cams unless you get them real cheep.

[Grandmarchris]

How much would it run me to get it done??

[turbo2256b]

How much would it run me to get it done??

Have to check on the break down of options had a sheet here somewere but since I am moving lots of stuff mixed up.

[Grandmarchris]

Just a ballpark figure would be fine..Im thinking of taking the heads of a 93 thats in a local boneyard and getting them cleaned, magnafluxed and ported.

[turbo2256b]

Just a ballpark figure would be fine..Im thinking of taking the heads of a 93 thats in a local boneyard and getting them cleaned, magnafluxed and ported.

Prices run from 600.00 to around 1000.00 depending on what you want done and need done. 1000.00 includes bigger valves new tappered guides.

[88Vic]

Are these 93 heads PI or not? I bet ported PI heads and intake will be a drastic improvement over non ported non-PI heads and intake.

[Sprucey]

93 heads are not PI. Mustangs got PI heads in 99MY. CV/GM/TC got them in 01MY

[Grandmarchris]

I would use a pi head but I would have to redesign my cold air intake and I dont know if the pi intake would even work with the wires and everything already in place in my 92'..Unless I could use the front facing NPI intake with the PI heads wich I doubt

[zwack88]

So let me get this straight, you are going to port non pi heads and keep that shitty stock intake? You need to get the PI intake and PI cams with it to make it even worth while.

[Nathan in MI]

So let me get this straight, you are going to port non pi heads and keep that shitty stock intake?


The non PI heads ported from my shop will flow more than PI heads.
...

[Grandmarchris]

Im just leary about using a plastic intake..I would rather port out the NPI than use a craptastic plastic intake

[zwack88]

That is the heads Nate. I was talking about the intake and the cams.

The PI intake has the aluminum crossover so it won't break.

[Nathan in MI]

Okay, guess I misunderstood you. From what you said it sounded like you thought porting the non-PI heads was a bad idea.

[Grandmarchris]

Can you even use the PI inkate on the NPI heads???

[zwack88]

Yep. You use non pi gaskets. There is a write up over on CVN.

[turbo2256b]

We can port the non PI heads to match the PI intake. Ported non PI heads will out flow ported PI heads. The expence of PI or other aftermarket cams are not realy worth the cost on ported heads. Increasing the vale size works better. We also have our own valve design designed by us which flow better than the aftermarket ones. They are also a specal size flownd to flow better in the combustion chamber.

[Grandmarchris]

I would go to PI's but im worried about...

Mainly making the trottle cable work like it should when I move the intake forward and to the right...EGR shit vacum line etc

And its a 92' REP block I don't think PI heads will fit it

[drock96marquis]

While the heads are off have the valve seats ground down so you can run PI cams in the nPI heads.


Modular head porting is no simple matter, don't cheap out.


You can use a PI intake on the nPI heads. Use PI gaskets, with a dab of RTV in the small corner of the front water jacket.

This makes for 2 dabs of RTV - vs 8 beads of RTV (1 on each airport) trying to use nPI gaskets for the PI intake swap.


Might as well go all-out and convert the car to OBDII as well.
It would prove more cost-effective to just find a donor 01-02 CV/GM and nab the wiring, engine, PCM, etc.

[Chevro]

what about port/polish heads, and port matching stock heads/intake and exhaust on a 92?

[turbo2256b]

All the Mod heads run about the same to port 600.00. Some have more material to remove than others. With options they can run up to around 1000.00. The 4 valves start around 1000.00 and go up with options.


I sugest port matching Non PI heads to the PI intake or there is a severe port mismatch. The PI intake is tuned to aroud 1000 RPM higer peak.

[Grandmarchris]

So it would be cheaper to do the simple head swap

[turbo2256b]

So it would be cheaper to do the simple head swap


Depends on the HP you want. HP costs money.

[Grandmarchris]

Im debating between 4 options

Running a PI intake with ported NPI heads

Running PI everything

Running with an edelbrock PI intake only

Converting it to carb and running a barry grant speed demon or holley 575 cfm carb

[turbo2256b]

Im debating between 4 options

Running a PI intake with ported NPI heads

Running PI everything

Running with an edelbrock PI intake only

Converting it to carb and running a barry grant speed demon or holley 575 cfm carb
Havent seen a 4 bbl intake for a mod motor I think there are some now. The BG carb in all the test I HAVE SEEN out performs the Holly enough to warent the cosst differance. I suggest vacuum secondary with out heavy cars. Head porting would also be easyer to tune for. Porting can be good for 100 to 150 HP but is expensive to accomidate with FI.

[p71towny]

Carb conversions for these cars are retarded money. You could bolt on a supercharger and be done with it for that money.