Header Porting?

mytight95 · Feb 21, 2006

Who has done this, i noticed when i went to put my gaskets etc. on the heads that they matched the port of the head almost perfectly, and put them to my headers just for Snits&giggles, WAY OFF, so i gasket matched my header openings. Does anyone think that this will help, or has anyone else done this?

here are some pics... lemme know what you think

Oh yeah i must add, be careful if you do this, i now have to take one to work and tig down one side of the number one primary lol

trying to maximize what i got...... couldn't really afford new headers right now..... long tubes are in the works in a couple of months..

jason

final5-0 · Feb 21, 2006

Flow can be improved in this area

No different that any other instance where two parts with ports bolt together.

You mock em up to see how they match.

The focus in on the match up of the parts and not so much the gasket.

I do confess to spending a bit of time in this area on my combo

Yes, you could go a bit too far with the old die grinder and see daylight through a hole that is not supposed to be there

Hey Jason

Are you having any fun yet

Grady

94gts · Feb 21, 2006

the pics are red x's for me.

so was this the afr 165's? and what headers are they?

BlownFiveLiter · Feb 21, 2006

I believe a lot of guys that run the stock classes do this as a way to increase exhaust flow for more power. You mentioned having to TIG the one primary, but I'm almost positive that they re-weld all of the primary tubes on the outside, so they have the room to grind away on the inside. I had been planning it myself, since my bro can weld pretty good.

mytight95 · Feb 21, 2006

well i am gonna weld it up tonight, i will weld the ones i need on the outside to get the clearance i need as i am not done.... just wondering what other do this?

Grady, i am trying to do this right this time, have been slowly putting the car back together for a week. should be worth it... I hope... throw 2g worth of parts at a car, i hope somehting good comes of it...lol

jason

final5-0 · Feb 21, 2006

mytight95 said:
well i am gonna weld it up tonight, i will weld the ones i need on the outside to get the clearance i need as i am not done.... just wondering what other do this?

Grady, i am trying to do this right this time, have been slowly putting the car back together for a week. should be worth it... I hope... throw 2g worth of parts at a car, i hope somehting good comes of it...lol

jason

Looks to me that you are paying attention to detail.

IMHO, that is always a good thing.

Screw the tech stuff

HAVIN ANY FUN YET ???

Grady

mytight95 · Feb 21, 2006

well i am still at work, but at least they are welded back up.... we went around almost all the primaries so i could finish opening them all the way up.

jason

chefster · Feb 21, 2006

Ya I ported mine,it makes no sense to port everything else and then leave that resistance at the headers...my car runs awsome

Killercanary · Feb 21, 2006

I port matched my headers by grinding down the excess welds on each of the primaries. The FMS headers I have had an excessive amount of welding slag, and that is all I removed.

mytight95 · Feb 21, 2006

I will post the finished result tomm. And YES Grady i am having fun lol

Has anyone who done this on a header with a flange ever considered cutting the flange, leaving two bolt holes and the neccessary flange to bolt it up only.....

seems as if it would seal better...i have noticed a lot of headers that are made that way, i can do that with the plasma cutter here at work without trouble and make it look clean if it is worth it.

jason

BlownFiveLiter · Feb 22, 2006

I'm sure it's been done (cutting the flange), but if you ever remove them for any reason, it can be difficult to put them back on. The primary tubes distort with heat, and they might not line up with the exhaust ports without a little extra elbow grease.

Killercanary · Feb 22, 2006

I bought my headers mainly for the fact that they DID have one continuos flange running between all the primaries for the warping reasons Matt mentioned in the above post. I wouldn't cut them if it was my car.

nmcgrawj · Feb 22, 2006

Killercanary said:
I bought my headers mainly for the fact that they DID have one continuos flange running between all the primaries for the warping reasons Matt mentioned in the above post. I wouldn't cut them if it was my car.

Same here

Are you guys just using a dremel to clean them up? What kind of bit?

final5-0 · Feb 22, 2006

nmcgrawj said:
Same here

Are you guys just using a dremel to clean them up? What kind of bit?

Same stuff I used to port my heads ... die grinder & carbide burrs.

No reason a dremel and their associated bits would not work here as you are not really removing all that much material for this application.

Grady

mytight95 · Feb 22, 2006

dremel would work fine.

I decided against cutting them after he made that point about the warpage. I have both welded out, and the the tubes matched to the gasket, the gasket is very slightly larger than the head port so there should be no turbulence.

jason

final5-0 · Feb 22, 2006

The thing about this whole deal is

The ports on the AFR's are sooooo wide

If you look at the width of the header pipe from outside to outside

That is still more narrow than the port

Any you go about it, some of the port is gonna be covered

I have been told 1 3/4 pipes don't cover that bad.

Ain't hot roddin exasperating from time to time

Grady

mytight95 · Feb 22, 2006

actually grady with the work i did to those, none of the port is covered now.... But took welding ALL the primaries on the outside, and REALLY opening them up..

I like the small stuff like this better than other stuff i have done to the car though, headers are back on the car, and got my gauges plumbed up today, along with some other tedious stuff, she will run by this weekend.. I HOPE

jason

94gts · Feb 22, 2006

can you possibly rehost those pics because all i see is red x's

GRGT1994 · Feb 22, 2006

I have heard that cleaning up the headers like this really only yields marginal HP in a street car. Nothing you would ever feel, and maybe not something you would clearly see even on a before/after dyno.

But then again, more power to you on hitting all the details.

Killercanary · Feb 22, 2006

GRGT1994 said:
I have heard that cleaning up the headers like this really only yields marginal HP in a street car. Nothing you would ever feel, and maybe not something you would clearly see even on a before/after dyno.

But then again, more power to you on hitting all the details.

Its these "attention to details" that will put you ahead of similarly equipped cars. Ever wonder why one guy with HCI out powers similarly equipped cars... its all in the details.

Header Porting?

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