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Indy 3X , 550 cubes, gains from p porting the intake? #2976772
10/21/21 11:02 AM
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My 550 cu in motor with 15-1 compression, .870 lift roller on methanol has the 3X Indy intake. Anyone have a 3X ported? Gains? I have port injection.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: gregsdart] #2976778
10/21/21 11:26 AM
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Have you ran it on the dyno yet?


69 GTX 68 Road Runner
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: gregsdart] #2976794
10/21/21 12:09 PM
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Hard to say. With port injection the manifold should be flowing mostly air and air goes around corners a lot easier than fuel. If it was my engine I'd run it enough as is to get a really good baseline and then I'd pull it apart and look it over. If the manifold looks like it needs some help then I'd send it to Wilson Manifolds and let them smooth it out.

Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: gregsdart] #2976813
10/21/21 01:14 PM
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If I'm remembering correctly that intake has distribution issues with the #2&4 and the #5&7 intake runners supposedly due to those two dividers sticking out to far into the plenum under the carb. scope work
Maybe it won't be a problem with air only running down the runners shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: JERICOGTX] #2976825
10/21/21 01:36 PM
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Originally Posted by JERICOGTX
Have you ran it on the dyno yet?

14 pulls, less than 3 inch crankcase vacuum.

20200729_190136.jpg20200729_190124_HDR.jpg

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: gregsdart] #2976839
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Show us some pics of the plenum and we can guide your decision. Because it is essentially a 'dry' manifold you won't have bad distribution issues.

Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: gregsdart] #2976840
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looks like it wants to be shifted higher than you pulled it too work scope


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: gregsdart] #2976867
10/21/21 03:14 PM
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On my 512 I gained over .12s and at least +1mph from removing that damn clover shape out of the top of the 4500 intake.


'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

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https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: Cab_Burge] #2976883
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Originally Posted by Cab_Burge
looks like it wants to be shifted higher than you pulled it too work scope

1-2. At 7450 rpm, 2-3 at 7350 rpm. I tried higher and lower rpm, this was the sweet spot. Lag in the trans is worse on the 1-2 shift. Airshifter set at 7250. Next outing I will have seperate rpm settings for each shift.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: Dragula] #2976888
10/21/21 04:37 PM
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Originally Posted by Dragula
On my 512 I gained over .12s and at least +1mph from removing that damn clover shape out of the top of the 4500 intake.

I just called Wilson manifolds and it sounds like they would do a similar reshaping on mine. It won't be cheap if I have them work on it but I have spent more$$$$ for a shot at less power gain.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: gregsdart] #2977136
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Originally Posted by gregsdart
Originally Posted by Dragula
On my 512 I gained over .12s and at least +1mph from removing that damn clover shape out of the top of the 4500 intake.

I just called Wilson manifolds and it sounds like they would do a similar reshaping on mine. It won't be cheap if I have them work on it but I have spent more$$$$ for a shot at less power gain.

There's probably 25 or so HP in porting it TO YOUR APPLICATION. But again because it isn't a wet application I don't feel that is hard to do for ANYONE who knows what their doing. There may be something obvious in the plenum. Pipemax will give you ideal intake track length #'s. I believe the power you got off the dyno..where does that put you in your 3050lbs? I think you're not using all you have. Just trying to sae you some unnecessary money.

Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: HardcoreB] #2977152
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Originally Posted by HardcoreB
Originally Posted by gregsdart
Originally Posted by Dragula
On my 512 I gained over .12s and at least +1mph from removing that damn clover shape out of the top of the 4500 intake.

I just called Wilson manifolds and it sounds like they would do a similar reshaping on mine. It won't be cheap if I have them work on it but I have spent more$$$$ for a shot at less power gain.

There's probably 25 or so HP in porting it TO YOUR APPLICATION. But again because it isn't a wet application I don't feel that is hard to do for ANYONE who knows what their doing. There may be something obvious in the plenum. Pipemax will give you ideal intake track length #'s. I believe the power you got off the dyno..where does that put you in your 3050lbs? I think you're not using all you have. Just trying to sae you some unnecessary money.

The last runs I made were at 3015 lbs, went 154 mph at 8.84. BUT, I had some serious issues. The trans was hurting, found a bad wobble. At passenger side front. Now I know why the acceleration graph looks like it does😟


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: gregsdart] #2977227
10/22/21 12:40 PM
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My S/P car has a 512 C.I. 400 stroker bracket motor with 15.0 to 1 comp. ratio with Indy 440-1 heads with a Indy 400-3 intake and a Wilson 2.0 inch high reversion spacer under a E85 Dominator that probably flows right at 1000 CFM luck
the car weighs 2850 Lbs. with me in it and has ran two 8.882 at 148 MPH shifting the Powerglide at 7000 RPM and ran 8.886 at 150. MPH on the next run one hour later shifting it 7300 RPM shock work
I'm thinking the two B1 and B1-MC motor I will be building soon will like to be shifted at 7500+ like all the other B1 motors I've heard about work shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: Cab_Burge] #2977255
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For what it is worth for this discussion, this is what the Indy Catalog shows for the 440-3 and 440-3X intakes.

IndyCatalog_intake_compare.jpg
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: 440Jim] #2977743
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Maybe a little cleanup was done?

20211023_171441.jpg20211023_171544.jpg
Last edited by gregsdart; 10/23/21 10:18 PM.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: gregsdart] #2977768
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Is this intake a early 440-3 or the later one with the single cast in boss for the EFI injectors?
There is a distinct difference in the two on the intake runner divider length sticking into the plenum shruggy
I think the later manifolds stick in further than the original ones with the two cast in individual bosses for the EFI injectors scope
Your picture looks like the original shorter dividers clean up a little confused


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: Cab_Burge] #2977799
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I just had Wilson Manifold convert a Indy 400-2 4150 to a 4500 series flange, port the plenum and gasket match for max wedge ports. They did an amazing job and quick turn a round.


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Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: Wicked49670dart] #2977839
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Looks like Gregs manifold has been relieved around the throttle bores a bit.
Perhaps to accommodate a carb with slightly larger than “standard”(2”) 4500 throttle bores.

If Greg is running a throttle body with one large bore(like a flying toilet), I feel like the cloverleaf stuff should def go.
Although, with the plenum area being dry, it may not amount to much of anything.


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Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: Cab_Burge] #2977843
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Originally Posted by Cab_Burge
Is this intake a early 440-3 or the later one with the single cast in boss for the EFI injectors?

I believe Greg is using a -3X manifold, not the -3

I know the -3X is a lot taller (see Indy catalog), but I don't know if the plenum to runner area is larger in cross section.


1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1
Re: Indy 3X , 550 cubes, gains from p porting the intake? [Re: Cab_Burge] #2977978
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Originally Posted by Cab_Burge
Is this intake a early 440-3 or the later one with the single cast in boss for the EFI injectors?
There is a distinct difference in the two on the intake runner divider length sticking into the plenum shruggy
I think the later manifolds stick in further than the original ones with the two cast in individual bosses for the EFI injectors scope
Your picture looks like the original shorter dividers clean up a little confused


My 3X has vertical injecters bosses. I bought it in Jan of 2003. Looks like i did some whittling for the four Terminater 2.5 inch throttle blades.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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