here are my pics from porting
you can see the difference in the first pic of the turbo housing on the right is ported and on the left isnt.
i got a little crazy on the exhaust manifold with the flange. i put a hole in it got a little crazy with the die grinder. but i welded it back up and all is well i need to still port the heads but the manifold turned out great as did the turbo housing. On cylinder 1 i noticed the exhaust gasket looked like a moon it was sucked in and blocking the port so with new gaskets and some porting hopefully this thing rips

 

here are some more

 

I have done my share of grinding, but I have never done any porting.

How long does it take to make the amount of difference shown in the first picture of the turbo ??

What are you using as a grind-stone ??

How far back are you "tapering" the openings ?? (maybe a little too far, seeing as how you went through in one spot)


In your description of the #1 gasket, I can't get a mental picture of just what happened; did the gasket somehow slip from where it should have been ??


I would be interested in how much up-hill towing EGTs change after porting.


Thanks.

 

the gasket in the second post that i posted it looks like a moon kinda. i am tapering them back about 2 inches with a carbide cutter on the die grinder. i have an aggresive bit and it doesnt take a ton of time to remove the metal i will let you know the results look at all the pics thye will give you a good idea how much i took off

 

Looks like your on the right tract.................

 

I think I wanna do this! let me know how much it helps with egts and power! looks good! I have one question, how would porting your stock manifold compare to an after-market manifold???

 

It helps but the aftermarket one is still bigger.


Buy the aftermarket one and port it like I did

 

in the process of porting the head got 1 cylinder almost done but the rain came so no go today

 

Dumb question, I know; but, is the head off the engine for this ??


I assume it must be.

 

no i am not taking it off! i have enough room in the old chev to port them not the ideal way to do it but i got a good set up vaccumm and diegrinder work great together i would have to say the it isnt the best but thats how im gonna do it

 

I have done lots of porting and it is a lot more complicated than you think. Just opening up part of a port doesn't guarantee any results. Porting doesn't help if you increase the port size in an area that isn't restricting flow. Doing this will just cause turbulence, and the flow will drop off even though part of the port is bigger.

You have to be careful opening up the turbo flange, because it lowers the velocity of the exhaust, and velocity is major important to spinning up the turbo. Both volume and velocity work together to spin up the turbo, so when you change one of these the turbo operation will change. There are several books on porting that you can buy at hot rod shops, and they are great for information. They will teach you what not to do, and what works best. I have a flow bench at my shop, and we port many heads. I have had several customers bring in partially ported heads and we always flow test them before starting. 80% of flow less than factory heads, because they were opened up in the wrong places. Good luck with your port job, it looks like you have done a lot of good hard work.

 

That looks more like what I would call "gasket-matching." Always a good idea before assembling these poor-quality mass-produced castings.

 

So you are porting the head on the engine and I see the turbo was done with out taking it apart.

Sounds like a recipe for disaster to me, not to mention you can't reach the important parts of the head.

All you need is one shaving left over to get stuck on your valve seat or end up on your cylinder wall.

 

Everybody should read this post several times. Very good post.

For the reasons stated above, it's not always a good idea. Gasket matching should not be confused with port matching. Gasket matching just puts a wide spot in the flow path and causes the gases to slow down at that point, it's not generally helpful.

 

well it was worth it in my eyes a definite improvement in spoolup which is what i wanted. 50 -75 lower egts at wot with the denny t stage 2. so i actually like the mod i know not everyone will jump on board but i like what i did.

I didnt go buck nasty on the head just smoothed them out a little bit nothing drastic i also noticed a little bit more on the top to mid range so an overall improvement but thanks for the honest replies