porting heads...

[ericjon262]

http://wot-tech.com/shop/gm-60v6/350.../prod_342.html

Stage III port work and you'll get a mighty fine flowing set of cylinder heads.

they heads are almost definitely going to be ported at this point. I'm thinking about getting a set and sending them off if I can get them cheap enough!

[TGP37]

The bitterness of a 2nd rate product remains long after the sweetness of a cheap price fades.

[ericjon262]

The bitterness of a 2nd rate product remains long after the sweetness of a cheap price fades.

??? I was going to get a set of heads as a core, have them ported and machined while I work on the headers and other fun stuff with the heads I already have...

[TGP37]

??? I was going to get a set of heads as a core, have them ported and machined while I work on the headers and other fun stuff with the heads I already have...

Oh sorry man, that wasn't directed to you specifically. It is a quote I use often.

I wasn't saying your stuff is cheap, lol, no. It is a way to say, it may be pricey but you get what you pay for.

[ericjon262]

The gains are proportional to the work done. If you manage to achieve a good port job, you should feel the difference easily.

Once you get the heads off and the valves off, you will see exactly what needs to be ground down. Your not going to reshape the pocket, just remove the flaws and give a nice texture on the walls.

Put duct tape on your valve seats but allow the space to blend the back half. It may save the seal if your carbide jumps and grazes the seats.

A shop vac and lots of light is a must.....you don't want to breath aluminum flakes.

I pulled a set of LX9 heads today and got a good look at the ports, and now I see what Ben and Superdave mean about being easy to screw up. also, there's not much in the way of casting flash to remove, the castings appear to be VERY high quality, and VERY consistent.

[ForcedFirebird]

The gains are proportional to the work done. If you manage to achieve a good port job, you should feel the difference easily.

Once you get the heads off and the valves off, you will see exactly what needs to be ground down. Your not going to reshape the pocket, just remove the flaws and give a nice texture on the walls.

Put duct tape on your valve seats but allow the space to blend the back half. It may save the seal if your carbide jumps and grazes the seats.

A shop vac and lots of light is a must.....you don't want to breath aluminum flakes.

Yeah? Must be nice to have flowbench vision.

Trust me, it doesn't work like that.

You will ruin 3500 heads unless you have flow bench data.

[TGP37]

Trust me, it doesn't work like that.

You will ruin 3500 heads unless you have flow bench data.

Even just for a wall clean up? Not talking about reshaping ports, just texturing and flatten out the seams and rough spots.

The biggest obstruction I noticed on my 3100 heads is where the valve seats are drilled out, just behind the seats, on the pocket floor. Not saying 3100 and 3500 heads are the same, but surely there is still the hard edge from carving out the valve seats seat?

My theory is removing as little as possible to achieve smooth transition along the pocket floor and blend the pocket with the valve seat.

I'm not doubting you, I just find it hard to believe the heads would be junked by a conservative port job w/o flow bench.

[SappySE107]

Repeating ourselves doesn't do anyone any good. Your post...you just hurt flow again. Until you give up the idea that pretty ports make power, you are fucked.

[ericjon262]

I don't see anything worth going after without a flow bench and about 4 sets of heads to experiment with first. without removing the valves, the only thing I could see that might possibly net a slight gain would be to contour the valve guide a little bit. given time, I'm sure I could make great gains, but I think the port job I'm going to have done will be worth every penny of the $500 I'm paying for it. I would spend double that on just getting the heads and bench to test with, and then have to spend days trying to make something happen. I would like to see a before and after dyno on a 3500 with nothing changed but the heads and intakes to see what it's really worth, but I don't think that will happen anytime soon.

[TGP37]

Repeating ourselves doesn't do anyone any good. Your post...you just hurt flow again. Until you give up the idea that pretty ports make power, you are fucked.

I am fucked? No, I don't think so.

While we both know I can not achieve results like WOT heads, I am confident my work flows well. Implying I port to make it look pretty is just stupid and you know better.

Just because your work is assumed superior doesn't mean my work fails.


And another thing, wtf is wrong with discussing porting in a thread titled PORTING HEADS...?

[ForcedFirebird]

I am fucked? No, I don't think so.

While we both know I can not achieve results like WOT heads, I am confident my work flows well. Implying I port to make it look pretty is just stupid and you know better.

Just because your work is assumed superior doesn't mean my work fails.


And another thing, wtf is wrong with discussing porting in a thread titled PORTING HEADS...?

It's because with the 3500 heads, you have to take all the things you do to other heads and throw those ideas out the window. We have flowed heads that other people have done, and they either hurt flow, or don't change and hurt velocity. Ben is just irritated that you keep making suggestions and giving information as it is factual and we know otherwise.

[Superdave]

I'll back it up as well, 3500 heads are a different animal.


all the tips/tricks that come with a Summit porting kit of sanding rolls are pointless, lol.


Trust me, unless you've listened to that horrible howl of a Flowbench for hours upon hours.. making small changes one after another and seeing the same results you can't begin to appreciate what it takes. It's probably the same for the LSx guys. lol

[TGP37]

It's because with the 3500 heads, you have to take all the things you do to other heads and throw those ideas out the window. We have flowed heads that other people have done, and they either hurt flow, or don't change and hurt velocity. Ben is just irritated that you keep making suggestions and giving information as it is factual and we know otherwise.

If I do suggest something and I am wrong, I will stand corrected.... just let me know. I'd rather be wrong and corrected then believe otherwise and I don't ever claim something w/o believing it. My intentions are for the better.

Everyone has their moments, I understand that and I don't hold grudges. Ben will still be the guy I call for my turbo cam in the coming months.


You say "keep making suggestions"......Is there something else I am wrong with? Cause I don't get what the fuss is all about really. So I tossed out a bad idea, who hasn't?

[ForcedFirebird]

^^^Exactly. Not just the Summit stuff, but any book based on typical parallel ports.