[sdbob]

Thank you Tom for all the info. Questions answered. Where would be best place to get 409 carbs? I have mid 60s Pontiac afbs. As you said they are smaller. Would they function ok for street,response,fuel mileage.

[Mike Davis]

If the 409 style carbs are hard to find, the older Carter Comp 4760 and the 4762 would be good carbs for this type set up. I run Competition Series 9755 750's and have had really good luck with those. Although my car is limited street and mostly raced it idles great and drives on the street fine with the roughly 2-3K miles a year I drive it.
The E carbs are good but need jetting, rods and spring changes to make them work.
I have found 750's work great on any 421,428 and 455 combo.

[tom s]

As Mike D said the Carter Comp carbs are a great source also.Depending on what throttle arms that are on them you might have to fab linkage.Tom

[tom s]

T.Mike,those are dual 409 carbs and are taller than the single 409 carbs,they are usually more money and the front carb is pretty much a dump carb without air screws.Pretty much all pass car pontiac D port heads have the same size ports.If your ports are bone stock no telling how the ports are the reason most tend to port match to the proper gaskets with the same thing with intake manifolds.With pontiac SD carbs and pontiac dual 4 linkage you can set them up progressive so the car is running on the front of the rear carb,when you get into them the front carb will come in and at full tilt all 8 will be open,the reason for progressive.Some people like solid linkage so both carbs are on the same opening.I HATED that on the street!Tom

[TRADERMIKE 2012]

Tom. Mike, those are dual 409 carbs. and they are taller than the single 409 carbs., plus, they are usually more money than the front carb. and are "pretty much" a dump carb., less air screws. Pretty much, all pass. Car Pontiac "D"- Port Heads have the same size Ports. If your Ports are bone stock and there is no telling if they are, the reason most tend to Port match, is to properly match the Intake Manifold to the Head Gaskets. With Pontiac SD Carbs. and Pontiac dual 4 Linkage, you can set them up progressively, so that the Car is running on the front of the rear Carb. When you get into them, the front Carb. will come in first and at full tilt and all 8 Carb. Bores will be open simultaneously. Thus, the reason for the progressive Linkage. Some people like the Solid Linkage, so both carbs. are on the same opening. I HATED that on the street! Tom.

Thank you for the explanation, Mike.

[timwhitehouse]

Is it to late to get in on the later style bath tub intake? I’m a recent subscriber and just now saw this thread. I would love to have this intake and I would definitely use it!

[timwhitehouse]

Tom, Mike, John, Bob. Is it to late to get on the list for a late model version of this bathtub tunnel ram project? Please put me on the list if at all possible. Thank you

[tom s]

Guys,John has another load of late style intakes coming next week.Anyone that wants one get a check to him.He ships in the order he gets checks.I think only 2 or 3 spoken for at this time.About 4 weeks for machining and shipping.Not sure what he plans for the future as he has to order 20 intakes and 30 tops at a time.Tom

[timwhitehouse]

John, I’m interested in one of your late model bath tub intakes. Please contact me so I can be put on the list

[tom s]

Tim,no list,just send a check.Tom

[tom s]

Innova Engineering 1533E McFadden unit A Santa Ana CA 92705.$2565
List your screen name,full name and shipping address and phone number and email.
If you need more info you can call me at 5622430570.Tom

[timwhitehouse]

Thanks Tom , how much?

[timwhitehouse]

Never mind, got it

[Brian Baker]

Open question to the floor:

Who was responsible for developing the original "bath tub" intake? Pontiac engineers? A joint effort between Pontiac engineers and Mickey Thompson? What's the difference between a 542991 intake and a 54299?

[sdbob]

American Standard! Kohler! I know I'm a @@. Hmm good. question.

[johnta1]

Didn't Toth have an article on this in Smoke Signals?

[mgarblik]

Originally Posted by Brian Baker

Open question to the floor:

Who was responsible for developing the original "bath tub" intake? Pontiac engineers? A joint effort between Pontiac engineers and Mickey Thompson? What's the difference between a 542991 intake and a 54299?

There was a fantastic and very detailed 3-part article by Dimitrie Toth all about the bathtub intake, start to finish in Smoke Signals Magazine in the last year.

[tom s]

The 991 intake was a factory intake,the 99- was a over the counter intake sold by M/T.MT was involved with a alu company and I think that was how the relationship of that intake happened.MT had nothing to do with the tunnelram that I ever knew of.Tom

[rtanner]

Are there any available now???

[mgarblik]

Bathtub intakes are available now. They are fantastic castings and run great. See for sale ads by Tom on the forums. Performance Parts for Sale.

https://forums.maxperformanceinc.com...=861930&page=2