455 engine ideas wanted?! - ClassicOldsmobile.com


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Old December 3rd, 2017, 11:46 AM   #1
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Talking 455 engine ideas wanted?!

I am looking to build a street driven 455 with dual quads.

Not looking to go full race, so iron heads and pump gas. Will be backed by a Turbo 400 and burning tires with a Chevy 12 bolt with 3.91 gears and 295/50-15 tires.
Car will have PS only, no A/C or PB.

I am thinking around 10:1 with Ka heads. Dual 600 carbs and a simple electronic ignition.

Want it to look old school, nothing fancy!!

I could use the Olds experts to chime in....................
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Old December 3rd, 2017, 02:24 PM   #2
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Well first off you need to locate a dual carb intake manifold. I don't know how available those are these days.
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Old December 3rd, 2017, 04:47 PM   #3
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If you want a dual quad 455 with good street manners, I'd strongly suggest searching for one of the long-out-of-production Edelbrock dual quad intakes for a BBO. These are the only dual plane dual quad Olds intakes. I ran one on a street 455 years ago and got over 14 MPG in a 1971 Cutlass. Be sure to use a progressive linkage on the carbs.



Unfortunately, the E-brock can be hard to find, but they do come up for sale every so often. The Offy dual quad intakes are still in production, but your only options are the single plane 360 version or the goofy 180 version. The latter is divided down the middle, so effectively you have a single plane intake feeding the right bank and another feeding the left bank. The two sides don't communicate, and since the firing order isn't R-L-R-L, the pulses are not equally spaced. There's a reason why no other manufacturer in history has ever made an intake like that.

Of course, if you really want bling, you could look for one of these :

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Old December 6th, 2017, 12:50 AM   #4
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Of course, if you really want bling, you could look for one of these :


Joe, That's some BLING ! What is it ? Does it work well ? Tell me more.
Ralph
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Old December 6th, 2017, 10:38 PM   #5
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This thread has a dual quad intake that may be for sale:

https://classicoldsmobile.com/forums...eply&p=1060382

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Hello everyone, I recently picked up a 455 motor at an estate sale. I bought it without knowing any details of the internals. The motor was built for a boat but I jumped on it and bought it anyways. My plan is to tell the intake, headers and other boat specific parts and throw it in an olds.

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Old December 7th, 2017, 08:44 AM   #6
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Offenhauser also makes the dual plane dual quad in hi and low rise. Don't choke on the price.

http://www.offyparts.com/product_inf...roducts_id/259
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Old December 7th, 2017, 09:50 AM   #7
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Offenhauser also makes the dual plane dual quad in hi and low rise. Don't choke on the price.

http://www.offyparts.com/product_inf...roducts_id/259
Look again. As I said above, the out of production E-brock is the only dual plane dual quad intake for a BBO. Offy makes two dual quad intakes, the single plane 360 and the goofy 180, which is what you have linked. Again, the 180 is not a "dual plane", at least not in the conventional sense. The whole point of a dual plane intake is that the runners are configured so that successive cylinders in the firing order draw from alternate sides of the carb. For the 1-8-4-3-6-5-7-2 firing order, cylinders 1, 4, 6, and 7 draw from one side, and the others draw from the other side. Pulses are evenly spaced: 1-x-4-x-6-x-7-x and x-8-x-3-x-5-x-2.

On the Offy 180, the intake is divided down the middle and you have the RH side of the carb feeding the RH cylinder bank and the LH side feeding the LH bank. Instead of evenly spaced pulses, the LH side of the carb sees 1-x-x-3-x-5-7-x and the RH side sees x-8-4-x-6-x-x-2. Why this is a good idea remains a mystery.
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Old December 7th, 2017, 10:38 AM   #8
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Thanks for the correction Joe
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Old December 7th, 2017, 10:49 AM   #9
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Another thing to point out is that the Offy low rise offering pulls from left and right as Joe stated, it has a divider between the halves. The high rise version is basically a spacer attached to the carb pad which allows flow to be shared right and left.
I always found Offy to be a bit gimmicky.
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Old December 7th, 2017, 11:01 AM   #10
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Originally Posted by TripDeuces View Post
Another thing to point out is that the Offy low rise offering pulls from left and right as Joe stated, it has a divider between the halves. The high rise version is basically a spacer attached to the carb pad which allows flow to be shared right and left.
I always found Offy to be a bit gimmicky.
Even worse it that the Offy is really just a big flat plenum with no apparent attention to mixture flow or velocity. I've found that the best use for the Offy intakes is to mill the carb flanges flat and weld on an aluminum plate to mount a 6-71. This is how most Olds blower manifolds are made. Note that this one started life as an Offy 180, as evidenced by the milled down center divider.


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Old December 9th, 2017, 06:41 PM   #11
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Totally agree with above posts to this thread in regards to dual plane vs single plane intake advantages/disadvantages. I know euroman1959 is looking for something old school and similar to what I have. So here is my story .....

I am running an offy dual quad, single plane 360 intake on a 455. I wanted a dual quad set-up and didn't have much choice with intake options at the time and no E-brock dual plane intakes were available when I built this 455. The offy tunnel ram intake below I own was a consideration for the build.



However, I decided to stay with the single plane and add the offy cross ram adapters with holley 780 carbs. Quirky, odd, unusual and even gimmicky - YES. I had no idea how this set-up was going to perform but I like and wanted different. The offy carb linkage package I initially purchased for the cross ram adapters was too flimsy. Therefore, I fabricated a sturdier bell crank set-up pictured below to ensure the linkage was going to perform trouble free.



This intake/carb set-up, combined with the 455 build and drivetrain components will shred tires and chew-up pavement all day long. Idles fine, decent mid-range and plenty top-end. I went with a long shot and it proved exceedingly better than I expected.

Build with what's available today ... you can always swap out for a dual quad, dual plane intake down the road if you desire. Good luck!!

Mark
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Old December 9th, 2017, 11:30 PM   #12
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Originally Posted by euroman1959 View Post
I am looking to build a street driven 455 with dual quads.

Not looking to go full race, so iron heads and pump gas. Will be backed by a Turbo 400 and burning tires with a Chevy 12 bolt with 3.91 gears and 295/50-15 tires.
Car will have PS only, no A/C or PB.

I am thinking around 10:1 with Ka heads. Dual 600 carbs and a simple electronic ignition.

Want it to look old school, nothing fancy!!

I could use the Olds experts to chime in....................
If this is for your 73 you must be talking about an aftermarket 12 bolt since no OEM 12 bolts exist for your car. Your original 8.5" is plenty strong and with the right pieces is better in some ways than the 12 bolt.

Ever wonder why performance guys don't runt dual quads? Because they suck. A well tuned 4bbl will feed any street engine. Dual quads is for show not for go.
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Old December 10th, 2017, 07:43 PM   #13
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Thanks for all the great info...........

The engine will NOT be going in my 73 V code Supreme. It would be going in a 70-72 Cutlass, thats how I will be using a Chevy 12 bolt rear.
I like the drivability of the Edelbrock dual plane manifold, and the choke would be nice too.
I have found an Offy 180 with dual Holley carbs. It had a well made adaptor plate made of a billet piece of aluminum about 1/2 inch thick. It is very reasonably priced, but I haven't pulled the trigger yet. Still hoping for the Edelbrock.

My sole purpose of the dual quads is for the 'WOW' when I lift the hood. The car will be plain and simple, nothing that would turn heads..........until the light turns green!

Is there anything I am missing??
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