Intake Manifold Porting Show ‘n Tell

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RevTheory
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Re: Intake Manifold Porting Show ‘n Tell

Post by RevTheory »

I was hoping to see some ported BBC stuff. I'm finding myself in a conundrum where I think an argument can be made for a smaller-runner single-plane with the stroke of a 496 but a Performer RPM Air Gap is probably the wiser choice. I also keep hearing that throttle-body EFI (Holley Terminator X Stealth) doesn't play well on dual-planes but I haven't squared that one off in my mind yet.

I'm getting sick of looking at Performer RPM Air Gaps, lol
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Re: Intake Manifold Porting Show ‘n Tell

Post by Lloyd klem »

Have ran 2927 on 427 through 496 many times.Old dart worked fine back in day with a little work.Didnt have many choices when they came out.So we learned how to make them work.My personal go too would be sniper jr
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Re: Intake Manifold Porting Show ‘n Tell

Post by mt-engines »

RevTheory wrote: Sun Dec 04, 2022 4:02 pm I was hoping to see some ported BBC stuff. I'm finding myself in a conundrum where I think an argument can be made for a smaller-runner single-plane with the stroke of a 496 but a Performer RPM Air Gap is probably the wiser choice. I also keep hearing that throttle-body EFI (Holley Terminator X Stealth) doesn't play well on dual-planes but I haven't squared that one off in my mind yet.

I'm getting sick of looking at Performer RPM Air Gaps, lol
A 496 won't be short of torque.. might as well get some rpm and make some HP.

The 2927 is a great manifold. They work well even on 540-565" engines

Can't go wrong with the Sniper Jr.

I like to mill the carb pad down .500"-.625" and port match them about 3 inches back for your basic 750-825hp pump gas 496 deal. It adds hood clearance and still makes good power to 76-7700.

I'll look and see if I have any pics of either.
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Re: Intake Manifold Porting Show ‘n Tell

Post by mt-engines »

NXBOY wrote: Sat Dec 03, 2022 11:46 pm Any Ford bigblock guys here?? We need more help with manifolds hen any of you all lol.
Eliminator Products makes a killer intake. If you like RPM
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Re: Intake Manifold Porting Show ‘n Tell

Post by NXBOY »

How would it be on a motor 6000-7200? 521
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Re: Intake Manifold Porting Show ‘n Tell

Post by mt-engines »

NXBOY wrote: Sun Dec 04, 2022 10:39 pm How would it be on a motor 6000-7200? 521
Only used 1 on a 545" A460 . Made peak torque at 6500

If you are talking about Cobra Jet, the Speedmaster one isn't too bad. Do a dominator conversion to it. And open up the long runners a bunch.
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Re: Intake Manifold Porting Show ‘n Tell

Post by frnkeore »

So, how much is TO rough in texturing?

Some of the pics, show, what looks like a much rougher finish than a burr finish.

Also, are there any A/B tests on how much improvement there is in both HP and AFR, with the rougher finish?

Since we are now working with the boundary, do you increase the CSA? If so, by what %?
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Re: Intake Manifold Porting Show ‘n Tell

Post by ChopperScott »

AFR 4811, still in progress…
15B778B3-C6B0-4F04-9B3C-51EE7E7F75ED.jpeg
3104473C-DBFC-4C9D-9148-937EA63539B5.jpeg
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Re: Intake Manifold Porting Show ‘n Tell

Post by Bigchief632 »

ChopperScott wrote: Tue Dec 06, 2022 11:55 pm AFR 4811, still in progress…

15B778B3-C6B0-4F04-9B3C-51EE7E7F75ED.jpeg

3104473C-DBFC-4C9D-9148-937EA63539B5.jpeg
Looks good, but I'd square the flange off, and blend that all in. Opens your options for carb spacers too.
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Re: Intake Manifold Porting Show ‘n Tell

Post by 1972ho »

Just curious about this type of intake design,what does it change in how the engine hp and torque are made and will it do anything for engine rpm over the conventional method of porting a intake manifold.Just curious that’s all?
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Re: Intake Manifold Porting Show ‘n Tell

Post by ChopperScott »

Bigchief632 wrote: Wed Dec 07, 2022 11:33 am
ChopperScott wrote: Tue Dec 06, 2022 11:55 pm AFR 4811, still in progress…
Looks good, but I'd square the flange off, and blend that all in. Opens your options for carb spacers too.
Thank you. IMO, there are plenty of options for other intakes if you prefer an open plenum without the clover leaf.
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Re: Intake Manifold Porting Show ‘n Tell

Post by 1980RS »

What's everyone's opinion of a SBC Brodix HV-1 or HV-1000 now? I picked one up last year for $dirt$ and you can't pass on something like that.
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Re: Intake Manifold Porting Show ‘n Tell

Post by ChopperScott »

Bigchief632 wrote: Wed Dec 07, 2022 11:33 am ...I'd square the flange off, and blend that all in. Opens your options for carb spacers too.
AFR has two available matching spacers for this manifold. An open clover leaf, or a tapered 4-hole...
IMG_7140.JPG
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434 SBC 11:1, 1.294, 6.178 @ 108.87, 9.81 @ 134.93 (3060#, Naturally Aspirated, Sunoco Ultra 94)
Chopper Air Port 917-589-1278
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Re: Intake Manifold Porting Show ‘n Tell

Post by mt-engines »

1980RS wrote: Wed Dec 07, 2022 3:57 pm What's everyone's opinion of a SBC Brodix HV-1 or HV-1000 now? I picked one up last year for $dirt$ and you can't pass on something like that.
Decent manifold for what it is. I've used a few. 383-421" combos. Carry power well and make decent torque for the size
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Re: Intake Manifold Porting Show ‘n Tell

Post by 1980RS »

mt-engines wrote: Wed Dec 07, 2022 4:45 pm
1980RS wrote: Wed Dec 07, 2022 3:57 pm What's everyone's opinion of a SBC Brodix HV-1 or HV-1000 now? I picked one up last year for $dirt$ and you can't pass on something like that.
Decent manifold for what it is. I've used a few. 383-421" combos. Carry power well and make decent torque for the size
Thanks, sounds like a winner on my 406 next year.
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