Gmc v6 4 barrel intake.

[Cuttyman9]

Some of you might not be on Facebook “big block gmc v6” group but over the last year or so I’ve been developing a 4 barrel intake manifold to fit these and have been seeking a company to make them.

Today I found a company who is willing and they got me a quote!

It can be made to happen if we get 10 people at 550 each.

The file size for pictures on here is tiny so I’m going to reference my Instagram so that you can see it. I’ve 3d printed a prototype (1pc) and am going to be checking my dimensions so I can submit the final revision of my drawing.

Reach out if you have any interest in this or any questions.

https://www.instagram.com/p/CR1lXMbHKXt/?utm_medium=copy_link
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[mongocanfly]

That looks cool...most of the time I cant see pics on that site..
See if these copies of your pics works here

[Steeveedee]

I don't need one, as I don't have a V-6, but that is one cool piece! Looks like a tunnel-ram. Hopefully you find enough takers.

[burnin oil]

I thought the same thing initially but I don't think that is much more than a performer RPM hieght wise. If the runners are sized good it should be a nice runner. I wonder if they can get a cam to support that air flow now. A quick look on the net says max HP RPM was only 3600 RPM with around 150 horses. Interesting for sure.

[The Rocknrod]

That would be good one for high RPM not so much for idle and low speed driving.

[special-K]

Big Block GMC? What's a small block? I thought you had to have a small block to have a big block. Sorry, a pet peeve of mine I guess. I think it's great to see performance parts coming around for these mighty motors. Gotta design off the original dynamics of these low RPM torque monsters. Some got it up top while others got it down low

[Steeveedee]

Isn't the biggest displacement of that engine something like 470+ cubes? Even if it doesn't wind up tight, more flow would still be beneficial if metered properly.

[Cuttyman9]

Originally Posted by burnin oil

I thought the same thing initially but I don't think that is much more than a performer RPM hieght wise. If the runners are sized good it should be a nice runner. I wonder if they can get a cam to support that air flow now. A quick look on the net says max HP RPM was only 3600 RPM with around 150 horses. Interesting for sure.

Yeah it’s not much taller, but it’s a much nicer shot to the port than stock with a much larger plenum.
Considering stock is a single plane it should still be an improvement as well as being aluminum vs iron.

There may not be a ton of RPM left on the table but I think if it can improve everything below the max I think it’s a win

Also cam wise delta cams will do weld/regrinds for 150 per cam (I have one based off my 478 cam)
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[Cuttyman9]

Originally Posted by special-K

Big Block GMC? What's a small block? I thought you had to have a small block to have a big block. Sorry, a pet peeve of mine I guess. I think it's great to see performance parts coming around for these mighty motors. Gotta design off the original dynamics of these low RPM torque monsters. Some got it up top while others got it down low

It’s the name of the group, I didn’t choose it.
It was probably chosen because it’s easy to identify that it’s not the Chevy v6 by saying big block.
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[Cuttyman9]

Originally Posted by Steeveedee

Isn't the biggest displacement of that engine something like 470+ cubes? Even if it doesn't wind up tight, more flow would still be beneficial if metered properly.

My thought process is more that if the factory setup was a compromise to begin with to push the torque peak as low as possible paired with a really restrictive cam then changing to a much better flowing intake and cam will make it perform in the rev range for light duty trucks and those using bigger engines might actually get the breathing these engines deserve.
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[Cuttyman9]

I actually pulled it off.

Still waiting for it to arrive but initial images look amazing.

I had to trim this down to make it even remotely cost effective but it’s 3d printed aluminum.

It almost doubled the initial price I was hoping for (albeit our govt ruined a lot of this with inflation anyways so oh well)

If he’s willing I might let Richard holdener dyno with this, my can and my spare 305 and see what happens.

I would imagine a stock 305 would be the worst to try whereas the 478 I picked up would be much more suited and the turbocharged version better yet.