SHO me some heads!

[illSHOyou]

That's some very interesting work. I love the radiused entries from the plenum to the runners.

The head work is very extensive. I would imagine that all the work to enlarge the communication area between the primary and secondary ports will negate much of the purpose of the long (small diameter) primary runners. On the other hand, the larger secondary runner looks like it has a much better distribution to both intake valves.

I would love to know more about this work. Who is doing it?

I am

What I was going for with the head work is the capability to first enlarge the communication area, and second move the communication point around. Where the intake manifold mates to the head could be the "New" communication point. We can do even better than that and move the point as high as possible into the intake manifold. This could set the stage for a ultra short secondary runner, only 3" to the intake plenum without horns, and 6" with horns. Not only that but we can closely almost match the lenght of the secondary port and primary ports. With a Ultra high communication point and the secondary horns installed the runners are almost equal length and each runner being served from a oppsite plenum. This could be wonderfull for the +40 cams. Low reversion, large mass flow to the head.

The point is....
I can play with the ports in many ways, create different shapes.

P.S. The red and silver intake, the owner has reported a .3 secs better in the quarter mile
15.8 first week, and 15.5 second week with intake installed, ATX

 

[victorymike18]

So, I'm not sure if the OP wanted this to turn to a technical discussion, but I'll continue anyway.

In regards to the port work you are doing:

You've opened up the port quite a bit, and completely eliminated the divider wall in the cylinder head. I wonder if by doing that, the true nature of the divided runner manifold has been comprimised.

The reason I say this, is that as the air is coming down the primary runner, it is going to loose a lot of velocity when it enters the large "communication" port between the runners. With that loss in velocity, there will undoubtedly be a change in the powerband before the secondaires open up.

On the other hand, It looks like the secondary port will have a much better shot at both valves, compared to the stock setup.

Just thinking out loud.

 

[illSHOyou]

So, I'm not sure if the OP wanted this to turn to a technical discussion, but I'll continue anyway.

In regards to the port work you are doing:

You've opened up the port quite a bit, and completely eliminated the divider wall in the cylinder head. I wonder if by doing that, the true nature of the divided runner manifold has been comprimised.

The reason I say this, is that as the air is coming down the primary runner, it is going to loose a lot of velocity when it enters the large "communication" port between the runners. With that loss in velocity, there will undoubtedly be a change in the powerband before the secondaires open up.

On the other hand, It looks like the secondary port will have a much better shot at both valves, compared to the stock setup.

Just thinking out loud.

Your right, I don't really know what the outcome would be either.

 

[egroce11]

Build me a set of intakes like the ones in the link and I'll run them on the salt.

http://images.google.com/hosted/life/f?q=Bonneville+source:life&imgurl=ef1c5df295f55494

That is a wild set.

Ernie

 

[NebraskaSHO]

Mmmmmhmmm Chrysler FirePower!

 

[illSHOyou]

Build me a set of intakes like the ones in the link and I'll run them on the salt.

http://images.google.com/hosted/life/f?q=Bonneville+source:life&imgurl=ef1c5df295f55494

That is a wild set.

Ernie

Ok, Take both your plenum tanks off and the balance tube, and wolla a wild set of SHO snakes...

 

[victorymike18]

http://images.google.com/hosted/life/f?q=Bonneville+source:life&imgurl=ef1c5df295f55494

I am surprised there are absolutely no radius bellmouths on the intake runners. I wonder if they knew back then how much a radius at the end of the runner can smooth the airflow coming into it.

As-is, the effective diameter of those runners is probably about 20% less than the actual diameter, just because of the way the air has to fight to get in...

On the other hand, that's a nice set of individual throttle bodies though. Similar to the V8 SHO, in how they are mounted directly on the head.

 

[gmail]

any updates?

 

[RJ-92]

The only way you are going to get close to 55whp increase is if you do the heads, cams, custom intake manifold and proper 1.75" primary headers.

Regardless of what you do to the heads and cams, the intake manifold is going to be the biggest restriction of air flow.

 

[supra dave]

ok this is just an update for any one that was going to follow this project of mine. i been out of the lop for the last 3 months due to my work, any way i couldnt find a good prise on a set of head for the mtx. well about 3 weeks ago i found a long block on ebay for 100 bucks. i was like **** yea and what do you know i won the bid. im going to pick it up next weekend and ship it off the following week. so ill be posting what i hope to be a nice dyno sheet some time in may or june. for those who like the S.H.O wish me luck. ill be getting back to you all soon.