Raised port Stude heads

[38flattie]

I still think this is a cool project! I hope Jack shares the flow numbers with you/us!

[zenndog]

Jack will Buddy. That is the point for all this. I need to know so I can decide if I should modify a pair of heads.

I am thinking about valves. I think the ports will be taken as far as I plan to take them by the end of this week. I think this port looks pretty good. I am looking into valve options.

I thought Midget would appreciate the different radii of the top and bottom of the port. I did it because he mentioned it. It also made it easier to fit without additional machining

I cobbled the port together but if I make a pair with all the ports raised less will be cut out around the ports and the "tubes" inserted will be one piece and welded before installing.

[Jon]

Cool project
Beware of making the port too narrow, the further a port gets from being a round cross section the less it will flow for the cross section.

Cheers
jon

[zenndog]

Jon- maybe it is already too narrow. ??. First time I ever tried something like this. If the results are promising then maybe I will try to make the next one a little wider and shorter.

I have a throttle body in mind for this project. The diameter of the tubing fits it. I tried to keep the tubing intact so I can use the same material to fab the intake. Maybe a backwards priority but that is what I did.

The radius at the top is 1" and at the bottom it is 3/4". Could be made a little wider next time.

[38flattie]

Zenndog, you're already pretty deep into this. Could you do another port, with the slightly different shape, and have them both flowed at the same time, to make informed comparisons?

[zenndog]

I tried to mimic the LS1 port. I guess I could have made it more exact but I didn't. The second port will be closer to a slightly raised stock port. The other two intakes will be a siamesed port the Jack wanted to try. I am going to ask Jack to send the head back. I can actually still make a head out of this head with the way I plan to actually fab the ports. If I can find a matched head I will make a pair, or I may have a "round 2" based on the results and try some new ideas.

There is discussion on the Stude site about someone who may make a Aluminum Stude head with ports more like a LS1. They will rum around 2000-2500 a set. I am more of a less money more time guy so........I am stuck with my little Frankenstien heads. And that is the way I like it.

[38flattie]

I do have a question:

You modified the port, but still came in at basically a 90 deg. angle to the valve, and had to radius the back of the 'new' port.

Would there be any benefit of trying to 'straighten' it out at this time, or would it negatively effect velocity too much?

[WOODY@DDLLC]

Chevy calls them cathedral ports but the guys who developed them referred to them as urinal ports! 

Just so you know! 

[zenndog]

Buddy-The Stude engine has a rocker shaft. If the port goes straight up it may start to hit stuff....but it is a thought.

[38flattie]

I wasn't thinking straight up, just straightening it as much as possible.

Pictures can be deceiving, so it may not be possible. Of course, I can offer all kinds of suggestions, from here in my armchair!

[zenndog]

No, I agree with you.

I played it safe because I don't have the rocker shaft You know...a real pro.........

It can probably be straightened out a little more, but one would need a rocker shaft to make certain you weren't hitting anything.

[SPARKY]

GM waaaaassss  not that happy with those ports  that is what they got when the didnt want to have to offset the rockers---as they did in their later versions to get more flow!

[zenndog]

Why didn't GM want to offset the rockers?

I am generally satisfied with the port, just want to see the flow results. It actually came out better than I thought it would.....so far.

[Jack Gifford]

Very entertaining!

[SPARKY]

cost---they were trying to get what they called "replicated" cyls.  with HIGH repeatability for emmision reasons--with efi they can tune it as 8 one cyl engs--- with repeatability they were able to do one tune that was good for many engs but the tune might vary from one cyl to another but they would all be in "chemostacia" or the best place for carbon and nigtrogen emmisions!!  I know,  I know spelling is horrible !!!