455 engine ideas wanted?!
#1
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....................
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....................
#3
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 :
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 :
#5
This thread has a dual quad intake that may be for sale:
https://classicoldsmobile.com/forums...eply&p=1060382
https://classicoldsmobile.com/forums...eply&p=1060382
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.
#6
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
http://www.offyparts.com/product_inf...roducts_id/259
#7
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
http://www.offyparts.com/product_inf...roducts_id/259
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.
#9
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.
I always found Offy to be a bit gimmicky.
#10
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.
I always found Offy to be a bit gimmicky.
#11
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
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
#12
Thoughts
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....................
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....................
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.
#13
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??
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??
#14
Found this engine, but it appears to be parts from several engines.
Block is serif F cast, F4, with 171 cast date. Has 4 speed boss and 32M571531 stamped on pad.
Crank is N and is drilled for 4 speed.
Heads are GA dated 158. Are heads big valve?
Engine has been reassembled without any machine work done. But seller says it needs minimum of bores honed because of pitting.
Came out of a 68 442 with a turbo 400 behind it.
Decent parts for a rebuild?
Block is serif F cast, F4, with 171 cast date. Has 4 speed boss and 32M571531 stamped on pad.
Crank is N and is drilled for 4 speed.
Heads are GA dated 158. Are heads big valve?
Engine has been reassembled without any machine work done. But seller says it needs minimum of bores honed because of pitting.
Came out of a 68 442 with a turbo 400 behind it.
Decent parts for a rebuild?
#15
Found this engine, but it appears to be parts from several engines.
Block is serif F cast, F4, with 171 cast date. Has 4 speed boss and 32M571531 stamped on pad.
Crank is N and is drilled for 4 speed.
Heads are GA dated 158. Are heads big valve?
Engine has been reassembled without any machine work done. But seller says it needs minimum of bores honed because of pitting.
Came out of a 68 442 with a turbo 400 behind it.
Decent parts for a rebuild?
Block is serif F cast, F4, with 171 cast date. Has 4 speed boss and 32M571531 stamped on pad.
Crank is N and is drilled for 4 speed.
Heads are GA dated 158. Are heads big valve?
Engine has been reassembled without any machine work done. But seller says it needs minimum of bores honed because of pitting.
Came out of a 68 442 with a turbo 400 behind it.
Decent parts for a rebuild?
Once I started getting into the guts of my 455, I started not trusting ANYTHING and replaced everything that could reasonably be replaced. I think all I ended up using was the block, the main caps, the rods, the front cover, the flex plate, and the ND crank. I'm glad I didn't pay much for it.
I spent $1800 on machine work alone. 030 over bore, decked, line-honed, rod recon, rotating assembly balance. I haven't added up my receipts to this point. I'm kind of afraid too, lol.
Good luck with your build.
#16
You never know what you get from someone else. I bought a '64 Starfire with a "transplanted" 455 and Turbo 400. I was told it was a '68 455. I figured out it had J heads, HEI that came out in'74. When the heads came off, I could see the deep dishes in the pistons (low compression). All of that that told me it was a 1974 or later.
Either way, you'll know what you have when you're done. Good luck.
Ralph
Either way, you'll know what you have when you're done. Good luck.
Ralph
#18
You never know what you get from someone else. I bought a '64 Starfire with a "transplanted" 455 and Turbo 400. I was told it was a '68 455. I figured out it had J heads, HEI that came out in'74. When the heads came off, I could see the deep dishes in the pistons (low compression). All of that that told me it was a 1974 or later.
Either way, you'll know what you have when you're done. Good luck.
Ralph
Either way, you'll know what you have when you're done. Good luck.
Ralph
I don't understand why some folks feel they need to be dishonest.
#19
Update....
Just wanted to update as to the progress of my dual quad build:
Bought the Offenhauser dual quad intake with a pair of matched Holley 9776 carbs. Intake has a 'machine shop built' carb adapter to allow the Holleys to be mounted front to back, not sideways.
Found a 72 455 block and crank that was just machined, a Comp Magnum 270H cam, got a set of big valve C heads and a Mallory dual point distributor that I will convert to PerTronix.
Just this morning I picked up the illusive Edelbrock O65 intake!
Probably will be looking for some AFB carbs for it and will most likely be selling the Offenhauser setup. (Didn't think I would find the O65!)
Its coming along nicely, with the help of many friends here on ClassicOlds.
Bought the Offenhauser dual quad intake with a pair of matched Holley 9776 carbs. Intake has a 'machine shop built' carb adapter to allow the Holleys to be mounted front to back, not sideways.
Found a 72 455 block and crank that was just machined, a Comp Magnum 270H cam, got a set of big valve C heads and a Mallory dual point distributor that I will convert to PerTronix.
Just this morning I picked up the illusive Edelbrock O65 intake!
Probably will be looking for some AFB carbs for it and will most likely be selling the Offenhauser setup. (Didn't think I would find the O65!)
Its coming along nicely, with the help of many friends here on ClassicOlds.
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April 20th, 2017 05:52 AM