Anyone Port their intake?

[Jon350]

I was thinking about getting my Performer RPM ported and or gasket matched. Just wondering what I can expect to pay for such a job. Also I'd just like to here anyone's experiences with such propositions.

 

[Jonstantine]

no experience, but if i get nice heads someday im going to port my torker1 intake myself (maybe) based on the article on jason.fletcher.net

matter of fact, that article talks about porting a rpm manifold for a 351... the rpm stock flowed a crapload and they got minimal returns from porting it (5hp up top)

so, if your going to pay someone, i dont think it would be worth it

 

[brianj5600]

Be careful, differences in velocity between runners means rich and lean cylinders. I am no expert, but know distribution can be altered by changing runner sizes. You can fix lean cylinders or create them. Study before attempting.

 

[The Dan]

Just had it done with a little other machine work and it was $175 on my invoice.

 

[ForceFed70]

Depending on your setup, I wouldn't bother to have them ported... just gasket matched. And even then, I wouldn't do it unless you also gasket match the heads.

The key is smooth air-flow... not big ports. A transition from a large port to a small port (from intake to heads) will give you worse airflow than if the manifold had smaller ports to begin with...

 

[brianj5600]

Ed Curtis of FTI says "Gaskets are for sealing, not designing a port." As air/fuel flows it slows down and speeds up with changes in port cross section. It takes energy to do this resulting in lost flow.

 

[Dr_Pain]

I was thinking about getting my Performer RPM ported and or gasket matched. Just wondering what I can expect to pay for such a job. Also I'd just like to here anyone's experiences with such propositions.

Porting or gasket match..... that is the question!!!!. The answer is one that involves pretty interesting aerodynamic stuff (i.e. air velocity, turbulence and atomization etc....) and is more complicated than you can imagine. If done properly, you can gain some SWEET horsepower and shave on ET's but improperly done, it can create nasty complication from mismatched air/fuel ratio between cylinders. The cost varies greatly.... I have seen good work for a cheap as $75 to as expensive as $1500.

Carburated vs. EFI??
CNC ported heads???

Port match is usually the way to go and the average cost of a good job for a carburated engine should be around $250. EFI should run you a little cheaper except if you have a multi-point injection system because of the injector bung protruding in the runner. The reason why EFI is a little cheaper is the guy does not have to come back and "scruff" it up to help the atomization. You may find people telling you that carburated is cheaper..... that's just because they skip a few step (which usually promotes that unequal runner air/fuel ratio mixture.

My 2 cents...... if you do not have stage II or III CNC ported heads, spend your money somewhere else to make the horsepower. If you want the general appeal of saying that your intake was port matched, and you have some disposable income, then go ahead..... It does sound cool!!!!

If you want to see some major ports, I do have a few pics of my last project which I had to port match the intake (forgot to take after pictures though)