Gen 3 Race Heads upgrade to Gen 4 Heads

[TT VIPER]

https://driveviper.com/forums/thread...ed-Gen-3-heads

[Exhlr8n]

Thanks

[TT VIPER]

Does anybody have any flow data on Gen 3 heads stock vs Gen 4 heads stock and Gen 3 heads ported vs Gen 4 heads ported?

[pokeyl]

http://www.speedstore.ca/VP4_flow_sheet.html

http://www.speedstore.ca/VP3_flow_sheet.html

[TT VIPER]

http://www.speedstore.ca/VP4_flow_sheet.html

http://www.speedstore.ca/VP3_flow_sheet.html

Thank you.

[TT VIPER]

Let me give you some update on what we are doing.
I first tried the option to sell the race ported Gen 3 heads and buy and build entire new Gen 4 heads but I did not get much interest in the race ported gen 3 heads I have.
Well, I decided to go the other route of making the Gen 4 intake fit the Gen 3 heads. Let's see how it will work.

[TT VIPER]

Meanwhile, the custom manifolds with 3" V band flange are ready. Next step is to fit the large Precision Gen 2 7675's somewhere.

[LATAMUD]

Let me give you some update on what we are doing.
I first tried the option to sell the race ported Gen 3 heads and buy and build entire new Gen 4 heads but I did not get much interest in the race ported gen 3 heads I have.
Well, I decided to go the other route of making the Gen 4 intake fit the Gen 3 heads. Let's see how it will work.

Pull the Gen3 intake off the Gen3 engine. Set the Gen4 lower half on top of the heads and see how the runners don't line up. You're going to have to chop up that intake to get the runners to line up properly. A lot of work for so little gain.

On the flip side, this IS something I would do just because I wanted to. I do like to make my own parts. If you separate the runners from the intake in banked sections, left side, right side, and shift them to line up with the head ports, then weld them back to the rest of the intake, I can see this working. As soon as I figured my above comment I committed to Gen4/5 heads and just be done with it.

[TT VIPER]

Pull the Gen3 intake off the Gen3 engine. Set the Gen4 lower half on top of the heads and see how the runners don't line up. You're going to have to chop up that intake to get the runners to line up properly. A lot of work for so little gain.

On the flip side, this IS something I would do just because I wanted to. I do like to make my own parts. If you separate the runners from the intake in banked sections, left side, right side, and shift them to line up with the head ports, then weld them back to the rest of the intake, I can see this working. As soon as I figured my above comment I committed to Gen4/5 heads and just be done with it.

As you will see in the AutoCAD drawing, we already 3D scanned the intake manifold and top of the engine. You can see in the picture how each runner is off and even the bolt locations are off. Separating each runner and welding them back is a lot of work. We are trying to do something faster by cutting some part of the lower section of the intake manifold and making a CNC plate for the lower section to make it fit. Still, a lot of work but I think it's doable.

[LATAMUD]

Any updates on this project?

[TT VIPER]

Any updates on this project?

Due to Covid-19 most of the shops here are closed and progress is very slow. We are mocking up the turbos into location and waiting for update from the CNC shop.

[LATAMUD]

Due to Covid-19 most of the shops here are closed and progress is very slow. We are mocking up the turbos into location and waiting for update from the CNC shop.

Same situation on my end, shop is closed. I just noticed in your photo above, you have a Gen3 intake lower half already prepped, looks like it's been cut open or the top 2/3 cut away. Year ago I saw a Gen3 intake that the lower half had all the gaps filled, top half was cut off and internally all the excess was gutted. When the top halve as welded back on the center was cut and filled with a flat sheet making it all a single plane/plenum intake. Still a Gen3 intake externally but more like a Gen4 intake internally. If I had more aluminum-welding skills I'd play with a Gen3 intake.

[LATAMUD]

Any updates?