SBC Intake Manifolds: Creating Another List.

[skinny z]

Here's an interesting back to back for you guys. This is a real Boss 302 347 build. Used Price Motorsports port stuffers, had a mild solid roller cam, and did a back to back with an air gap Performer rpm and a Parker single plane with a little bit of plenum blending. It's not a sbc, but shows the trend.

Do I see the Air Gap holding on to power to 6500? And some?
What are your thoughts on an open spacer rather than the 4 hole?

My SBC Air Gap pulled right up to 7K with no problems and ran 118mph.

Funny you should comment on that because that was going to be my next question to YOU.

[Bigchief632]

Here's an interesting back to back for you guys. This is a real Boss 302 347 build. Used Price Motorsports port stuffers, had a mild solid roller cam, and did a back to back with an air gap Performer rpm and a Parker single plane with a little bit of plenum blending. It's not a sbc, but shows the trend.

Do I see the Air Gap holding on to power to 6500? And some?
What are your thoughts on an open spacer rather than the 4 hole?

For that application, he used the dual plane. You can see how much more TQ it made between 3500 and 5000. Didn't pull it lower than 3500, but I'd bet it's dramatic. For a "resto" mod street driver, the dual plane is much better, with a mild rear gear and a 10 inch 3000 converter. If this was going to be set up for the "How would you go Faster thread?" The single plane would be much faster, because you'd gear appropriately and have a 5500+ rpm converter. I'd bet between the extra power up top, and the aggressive converter and gear, it would probably be a solid 1 second or more quicker and run several more mph. As far as the spacer, it liked the 4 hole to make that power. It lost with an open. Spacers are application specific, your results may vary.

[steve cowan]

Here's an interesting back to back for you guys. This is a real Boss 302 347 build. Used Price Motorsports port stuffers, had a mild solid roller cam, and did a back to back with an air gap Performer rpm and a Parker single plane with a little bit of plenum blending. It's not a sbc, but shows the trend.

Do I see the Air Gap holding on to power to 6500? And some?
What are your thoughts on an open spacer rather than the 4 hole?

For that application, he used the dual plane. You can see how much more TQ it made between 3500 and 5000. Didn't pull it lower than 3500, but I'd bet it's dramatic. For a "resto" mod street driver, the dual plane is much better, with a mild rear gear and a 10 inch 3000 converter. If this was going to be set up for the "How would you go Faster thread?" The single plane would be much faster, because you'd gear appropriately and have a 5500+ rpm converter. I'd bet between the extra power up top, and the aggressive converter and gear, it would probably be a solid 1 second or more quicker and run several more mph. As far as the spacer, it liked the 4 hole to make that power. It lost with an open. Spacers are application specific, your results may vary.

I found the same results with spacer on my last dyno session.
A 4 hole mis - matched tapered spacer made 15 more hp and corrected / smoothed AFR reading compared to a perfect fit 2" open spacer.
To say I was shocked was a understatement.

[Horder]

Do I see the Air Gap holding on to power to 6500? And some?
What are your thoughts on an open spacer rather than the 4 hole?

For that application, he used the dual plane. You can see how much more TQ it made between 3500 and 5000. Didn't pull it lower than 3500, but I'd bet it's dramatic. For a "resto" mod street driver, the dual plane is much better, with a mild rear gear and a 10 inch 3000 converter. If this was going to be set up for the "How would you go Faster thread?" The single plane would be much faster, because you'd gear appropriately and have a 5500+ rpm converter. I'd bet between the extra power up top, and the aggressive converter and gear, it would probably be a solid 1 second or more quicker and run several more mph. As far as the spacer, it liked the 4 hole to make that power. It lost with an open. Spacers are application specific, your results may vary.

I found the same results with spacer on my last dyno session.
A 4 hole mis - matched tapered spacer made 15 more hp and corrected / smoothed AFR reading compared to a perfect fit 2" open spacer.
To say I was shocked was a understatement.

Steve, was that on a small block and a Dual Plane?

[steve cowan]

For that application, he used the dual plane. You can see how much more TQ it made between 3500 and 5000. Didn't pull it lower than 3500, but I'd bet it's dramatic. For a "resto" mod street driver, the dual plane is much better, with a mild rear gear and a 10 inch 3000 converter. If this was going to be set up for the "How would you go Faster thread?" The single plane would be much faster, because you'd gear appropriately and have a 5500+ rpm converter. I'd bet between the extra power up top, and the aggressive converter and gear, it would probably be a solid 1 second or more quicker and run several more mph. As far as the spacer, it liked the 4 hole to make that power. It lost with an open. Spacers are application specific, your results may vary.

I found the same results with spacer on my last dyno session.
A 4 hole mis - matched tapered spacer made 15 more hp and corrected / smoothed AFR reading compared to a perfect fit 2" open spacer.
To say I was shocked was a understatement.

Steve, was that on a small block and a Dual Plane?

383 sbc
Ported 300-25 strip dominator
I suspect it was due to the reversion pulse and the tapered spacer was helping

[ChopperScott]

Here’s an old classic single plane, with minor port work. Weiand X-CELelerator 7546…

I'm still working on that one...

Weiand 7546 1234.JPG

[steve cowan]

[attachment=3]20220601_162935.jpg[/attachment][quote=ChopperScott post_id=930139 time=1668743674 user_id=35039]
[quote=ChopperScott post_id=930056 time=1668697241 user_id=35039]
Here’s an old classic single plane, [b]with minor port work[/b]. Weiand X-CELelerator 7546…
[/quote]

I'm still working on that one...

Weiand 7546 1234.JPG
[/quote]

[attachment=2]20220512_174853.jpg[/attachment][attachment=1]Screenshot_20220513-214245_Chrome.jpg[/attachment][attachment=0]20220512_174837.jpg[/attachment]
I like opening carb pad up,
This unmodified 2" 4 hole tapered spacer netted best overall power and lambda out of 20 dyno pulls.

[Lloyd klem]

I like the trick flow 'R' series.

[Tom68]

Single Planes are trending longer in the plenum area to straighten out the runners, I think it's only a matter of time for stretched out 1:1 linkage carbys to become fairly common. We're compromising the manifolds to fit traditional architecture carbys.

[ChopperScott]

I like the trick flow 'R' series.

Another late model manifold for big cubes and large heads. Looks like a competitive piece…

32397608-C641-4CD0-8201-B379BF89207D.png

[steve cowan]

I like the trick flow 'R' series.

Another late model manifold for big cubes and large heads. Looks like a competitive piece…

32397608-C641-4CD0-8201-B379BF89207D.png

20221119_145706.jpg

20221119_145630.jpg

What about the manifold in discussion going on my small cast iron headed 383,trying for the 10.0 club

[Lloyd klem]

Looking great Steve.I like the port width you are keeping at the floor.Imo I like to raise the upper left corner of port your on for better line of site.Jmo tho

[Lloyd klem]

I like the trick flow 'R' series.

Another late model manifold for big cubes and large heads. Looks like a competitive piece…

32397608-C641-4CD0-8201-B379BF89207D.png

Would be good for your engine imo.Has runner length for you rpm.Has tall plenum to not slam fuel charge into floor.At 399.00 priced reasonable for csa available imo.

[1980RS]

Here's an interesting back to back for you guys. This is a real Boss 302 347 build. Used Price Motorsports port stuffers, had a mild solid roller cam, and did a back to back with an air gap Performer rpm and a Parker single plane with a little bit of plenum blending. It's not a sbc, but shows the trend.

Do I see the Air Gap holding on to power to 6500? And some?
What are your thoughts on an open spacer rather than the 4 hole?

For that application, he used the dual plane. You can see how much more TQ it made between 3500 and 5000. Didn't pull it lower than 3500, but I'd bet it's dramatic. For a "resto" mod street driver, the dual plane is much better, with a mild rear gear and a 10 inch 3000 converter. If this was going to be set up for the "How would you go Faster thread?" The single plane would be much faster, because you'd gear appropriately and have a 5500+ rpm converter. I'd bet between the extra power up top, and the aggressive converter and gear, it would probably be a solid 1 second or more quicker and run several more mph. As far as the spacer, it liked the 4 hole to make that power. It lost with an open. Spacers are application specific, your results may vary.

That's what I thought this year too, but my SBC Air Gap bested my Single plane intake by .007 and the Air Gap 4 mph better than the single plane intake this year.

[Monza355]

I like the trick flow 'R' series.

Another late model manifold for big cubes and large heads. Looks like a competitive piece…

32397608-C641-4CD0-8201-B379BF89207D.png

20221119_145706.jpg20221119_145630.jpg
What about the manifold in discussion going on my small cast iron headed 383,trying for the 10.0 club

This Trick Flow manifold looks trick out of the box real promising piece there ! I will be looking to see your results Steve