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Old 01-14-2018, 01:38 AM   #126
Pure-Juice
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Re: 400/406 Builds

I have a new build I would like your thoughts on and any recommendations you have for stall speed, carb, headers, etc.

Chevrolet 400ci bored to 406

Scat 9000 cast steel Pro Comp 3.750" stroke crankshaft

Comp Cams Magnum Retro-Fit Hydraulic Roller Camshaft
280/280 duration
0.525"I/0.525"E lift
110 LSA

SRP Forged 21.00cc Dish Pistons, 4.155" bore

Eagle I-Beam forged connecting rods

Dart Iron Eagle Platinum 23 degree cylinder heads
64cc combustion chambers
215cc intake runners
1.600" exhaust valve dia.

Comp Cams 1.6 ratio Ultra Pro Magnum roller rocker arms

Edelbrock RPM Air-Gap dual plane intake manifold

Engine will be going in my 1969 SWB C10, with 4.11 gears, 20" wheels and a TH350 auto transmission. Goal of the build was for big torque numbers in the low to mid RPMs which will be used for mainly weekend cruising around.
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Old 01-14-2018, 01:41 AM   #127
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Re: 400/406 Builds

May be a little too much cam for the compression, but with the 4.11 gearing you may not even notice. Definitely will be a tire burner
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Old 01-14-2018, 02:06 PM   #128
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Re: 400/406 Builds

Quote:
Originally Posted by Pure-Juice View Post
I have a new build I would like your thoughts on and any recommendations you have for stall speed, carb, headers, etc.

Chevrolet 400ci bored to 406

Scat 9000 cast steel Pro Comp 3.750" stroke crankshaft

Comp Cams Magnum Retro-Fit Hydraulic Roller Camshaft
280/280 duration
0.525"I/0.525"E lift
110 LSA

SRP Forged 21.00cc Dish Pistons, 4.155" bore

Eagle I-Beam forged connecting rods

Dart Iron Eagle Platinum 23 degree cylinder heads
64cc combustion chambers
215cc intake runners
1.600" exhaust valve dia.

Comp Cams 1.6 ratio Ultra Pro Magnum roller rocker arms

Edelbrock RPM Air-Gap dual plane intake manifold

Engine will be going in my 1969 SWB C10, with 4.11 gears, 20" wheels and a TH350 auto transmission. Goal of the build was for big torque numbers in the low to mid RPMs which will be used for mainly weekend cruising around.
I think your combo will run great....I would call coan and ask what Pro Street Torque Converter they recommend. Jegs sells them and usually have in stock at a reasonable price. Tim
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Old 01-15-2018, 12:03 AM   #129
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Re: 400/406 Builds

I agree with a little too much cam for the static compression. Have you calculated the dynamic compression? Also the intake port of the heads is a bit too big for the rest of the combo. IMO a 180-195cc intake would be better for your power goals. I hope your tires are fairly tall with those 4.11 gears. A 650-750cfm carb would be fine.

Quote:
Originally Posted by Pure-Juice View Post
I have a new build I would like your thoughts on and any recommendations you have for stall speed, carb, headers, etc.

Chevrolet 400ci bored to 406

Scat 9000 cast steel Pro Comp 3.750" stroke crankshaft

Comp Cams Magnum Retro-Fit Hydraulic Roller Camshaft
280/280 duration
0.525"I/0.525"E lift
110 LSA

SRP Forged 21.00cc Dish Pistons, 4.155" bore

Eagle I-Beam forged connecting rods

Dart Iron Eagle Platinum 23 degree cylinder heads
64cc combustion chambers
215cc intake runners
1.600" exhaust valve dia.

Comp Cams 1.6 ratio Ultra Pro Magnum roller rocker arms

Edelbrock RPM Air-Gap dual plane intake manifold

Engine will be going in my 1969 SWB C10, with 4.11 gears, 20" wheels and a TH350 auto transmission. Goal of the build was for big torque numbers in the low to mid RPMs which will be used for mainly weekend cruising around.
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Last edited by Captainfab; 01-15-2018 at 12:09 AM.
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Old 01-16-2018, 01:43 AM   #130
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Re: 400/406 Builds

You won't need much stall with your cubes and 224* @ .050 duration. I'd use a 750 carb
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Old 01-16-2018, 02:11 PM   #131
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Re: 400/406 Builds

Thank you everyone for your advise and suggestions. This is my first engine build and I welcome any pointers that will help out.
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Old 01-16-2018, 11:40 PM   #132
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Re: 400/406 Builds

You can read back thru this thread and see what other people are using in their builds.

Quote:
Originally Posted by Pure-Juice View Post
Thank you everyone for your advise and suggestions. This is my first engine build and I welcome any pointers that will help out.
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Old 04-26-2019, 02:04 PM   #133
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Re: 400/406 Builds

Quote:
Originally Posted by Pure-Juice View Post
I have a new build I would like your thoughts on and any recommendations you have for stall speed, carb, headers, etc.

Chevrolet 400ci bored to 406

Scat 9000 cast steel Pro Comp 3.750" stroke crankshaft

Comp Cams Magnum Retro-Fit Hydraulic Roller Camshaft
280/280 duration
0.525"I/0.525"E lift
110 LSA

SRP Forged 21.00cc Dish Pistons, 4.155" bore

Eagle I-Beam forged connecting rods

Dart Iron Eagle Platinum 23 degree cylinder heads
64cc combustion chambers
215cc intake runners
1.600" exhaust valve dia.

Comp Cams 1.6 ratio Ultra Pro Magnum roller rocker arms

Edelbrock RPM Air-Gap dual plane intake manifold

Engine will be going in my 1969 SWB C10, with 4.11 gears, 20" wheels and a TH350 auto transmission. Goal of the build was for big torque numbers in the low to mid RPMs which will be used for mainly weekend cruising around.
Any updates?
What rear tire size? That combo should be fun around town & those heads will work just fine w/your intent on a 406.
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Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive.
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Old 07-03-2020, 11:26 PM   #134
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Re: 400/406 Builds

Finally bought a 400! I had the option of a 817 fully assembled or a 509 that was torn down. I bought the 509!! Standard bore, told them to keep the crank rods Etc. ...

I plan on a new rotating assembly, 5.7 rods, slight dish and around 9.3 to 9.4 compression. Any suggestions on a camshaft ?

Looking at summit vortec heads or AFR "as cast" 195 aluminum heads. 65cc average CC

1978 C10 - Big10 - Th350/3.08/28.0 tires

Edit - Would you buy a unknown 400 (817-1976) complete as is? asking $250

Last edited by Warrens69GMC; 07-03-2020 at 11:39 PM.
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Old 07-04-2020, 08:10 AM   #135
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Re: 400/406 Builds

You can get 6" rods for about the same price when you buy the rotating assembly. I really liked the SCAT setup that I got but ha e the balance rechecked by the machine shop as they can be very generous. Hopefully your block is a 2 bolt main since they are stronger than the factory 400 4 bolt main. Invest in some main studs if you are going to run any rpm. Before assembly make sure all your bolt holes are drilled and tapped. My 509 core didn't have the power steering bracket or clutch ball stud drilled. I didnt notice and had to do them in the truck and that is a giant PITA!!!
I think $250 is fair on a complete engine that hasn't been produced since 1980. LS motor popularity dropped prices some.
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Old 07-04-2020, 03:31 PM   #136
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Re: 400/406 Builds

Quote:
Originally Posted by kwmech View Post
May be a little too much cam for the compression, but with the 4.11 gearing you may not even notice. Definitely will be a tire burner
Quote:
Originally Posted by Captainfab View Post
I agree with a little too much cam for the static compression. Have you calculated the dynamic compression? Also the intake port of the heads is a bit too big for the rest of the combo. IMO a 180-195cc intake would be better for your power goals. I hope your tires are fairly tall with those 4.11 gears. A 650-750cfm carb would be fine.
Curious about these statements. When I do the math, it calcs out to about a 9.6:1 Static/8.4:1 Dynamic compression. The In/Ex duration @ 224° seems mild given the larger displacement of the small-block (406 vs. 355). I see many, many recommendations for around 230° for a 400+ cube motor. The head port sizing does seem off but I tend to go smaller than what the typical magazine builds suggest. When I calc'd this combo out, it estimated 400hp @ 4800rpm. TQ should be more than that as it's a mild motor combo.

Just curious of what I'm not seeing/considering.
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Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive.
It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.....

Cubic inches is like Indiana Jones with a cheap pistol.
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Old 07-05-2020, 06:06 AM   #137
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Re: 400/406 Builds

I have a uncut SBC 400 and I think its an 811 block, 2 bolt main anyway. All that is going to be used from the engine is the block and crankshaft. The block will be milled .30 over so I guess will be a 406 when done. The engine is going to replace the 90,000 original mile 350 in my truck as its, well got 90,000 miles and its never been opened. I just want a streetable driver engine with some get up and go as compared to the 350 which still runs strong. Here is the parts list my friend who is building it suggested to use and I bought everything in the picture from Summit Racing.


Heads are Cast Iron and made by DART for Summit with a 72CC Combustion Chamber and 2.02 intakes and 1.60 exhaust valves with a 3 angle valve job and there are more specs in the link. Saving for these as of this writing.
https://www.summitracing.com/parts/sum-152123

Pistons are Speed-Pro Hypereutectic with a 3.75 inch stroke and 5.7 inch rod length.
https://www.summitracing.com/parts/slp-h615cp30

Connecting Rods are Scat Pro I-Beam and 5.7 inches
https://www.summitracing.com/parts/sca-25700716

Cam Shaft is a Lunati Voodoo with 256/262 Duration and 454/468 Lift and is a 1-5000 RPM cam which will be good for me.
https://www.summitracing.com/parts/lun-10120701

Lifters are Chevrolet Performance # 12371044
https://www.summitracing.com/parts/n...make/chevrolet

Rocker Arms are Summit Brand G6800
https://www.summitracing.com/parts/sum-g6800

Pushrods are Summit Brand G6400
https://www.summitracing.com/parts/sum-g6400

Intake Manifold is an Edelbrock Performer # 2101
https://www.summitracing.com/parts/edl-2101

Also going with original Rams head exhaust manifolds as I have 2 1/4 inch front to back true duals with H-Pipe on the truck now. Planning on using the factory Q-Jet that's on the truck and my friend who is going to do the build for me is going to tweak the Q-Jet too. The truck has 3:73 gears with an Eaton Tru-Trac and a 700R4 transmission.
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Old 07-05-2020, 10:29 PM   #138
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Re: 400/406 Builds

That should be a good torquey engine. Let us know how you like it once it is built and installed.
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Old 07-05-2020, 11:12 PM   #139
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Re: 400/406 Builds

Quote:
Originally Posted by Captainfab View Post
That should be a good torquey engine. Let us know how you like it once it is built and installed.
Thank you and will definitely post it up when built and probably through the build. This is the engine I was asking about the timing cover on her last week as it wasn't on engine when I got it. My friend who is doing the build has done many small and big block engines over the years and I'm sure has some extras he'll do to the engine during the build.
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Old 04-30-2021, 10:31 AM   #140
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Re: 400/406 Builds

Just came across this thread doing some window shopping for my truck on your profile Cap. Thought I'd bump the thread and drop in the info for the engine currently in my truck. '67 C10 longbed.

Keep in mind that my dad had this engine built 10+ years ago for his Nova, so parts are a little dated.

- 1976 GM 400 block from a caprice, 2 bolt main, bored to 406, align honed and studded with ARP hardware
- 3.75" cast steel Scat crank
- Forged Scat 6" H beam rods
- Mahle D- Dish forged and coated pistons

- AFR Comp- ported 195 heads
- Cam Motion Solid Roller custom ground 262/269 at .050 duration, .630" lift
- Comp SS roller rockers
- Morel Hi PPO solid roller lifters

The engine has an ebay copy PP Hurricane intake on it, and is currently neutered via a Holley 650 and 1 5/8" headers leading into a 3" X- pipe. Still gets up and goes though, and it lets out a mean rasp when I let off and push in the clutch. Mated to a Muncie M20.
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Old 04-30-2021, 10:22 PM   #141
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Re: 400/406 Builds

That's a pretty sizeable cam, but I imagine it runs pretty hard in the mid range and top end
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Old 05-01-2021, 07:24 AM   #142
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Re: 400/406 Builds

Quote:
Originally Posted by Captainfab View Post
That's a pretty sizeable cam, but I imagine it runs pretty hard in the mid range and top end
You're absolutely right. It was purpose built to be a 1/4 mile engine but it behaves decently on the street so long as I cruise around /above~2200rpm.
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Old 05-03-2021, 01:44 AM   #143
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Question Re: 400/406 Builds

I found this post on a Honda forum but he refers to the sbc 400. Are these safe assumptions when making cam decisions?

https://www.d-series.org/threads/cam...7/post-2178630

"There are quite a few variables which make the same cam have different power bands in different engines.

Most of my experience with the same cam in different engines is with Small Block Chevies.

On a 400 SBC I would expect.

For an idle of 600 rpm and maximum torque at about 2500 rpm and maximum power by 4500 rpm and nosed over by 5000 rpm you would need about 225 deg duration at 0.050 lift.

For an idle of 700 rpm and maximum torque at about 3000 rpm and maximum power by 5000 rpm and nosed over by 5500 rpm you would need about 235 deg duration at 0.050 lift.

For an idle of 750 rpm and maximum torque at about 3500 rpm and maximum power by 5500 rpm and nosed over by 6000 rpm you would need about 245 deg duration at 0.050 lift.

If you want it to rev to 8000 rpm you need about 285 deg.



For an idle of 700 rpm,

The trends are:-

The longer the rods, the higher the power band.

The longer the stroke the lower the power band.

The smaller the ports the lower the power band.

With the same heads and cam, a 400CI SBC will develop it's power about 700 to 800 rpm lower than a 350. If you use a long rod 400, it changes the peak power to 500 rpm less.

A 350 is 4" bore, 3.48" stroke with a 5.7" rod.

A std 400 is 4.125" bore, 3.75 stroke and 5.565" rods

Long rods are 6" long

If you use after market high port heads on a long rod 400 you can bring the rpm for maximum power back to the same as the 350 with the same cam.

Alternatively with the long rod 400 and the original heads, you need about an extra 25 or 30 deg of duration for 400 to make maximum power at the same speed as an otherwise identical 350."
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Old 09-27-2022, 04:09 AM   #144
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Re: 400/406 Builds

Been well over a year since the last post in this thread so time for a bump and update on my 400 now 406.. The engine parts list that was used is in Post # 137 and engine is now together and been run on an engine stand to break in cam. It will be installed over the coming Winter. I have videos of it running but cant post on here.. 3 year build from when I bought the block till the engine fired up. Biggest delay was the engine machining took 7 months to get done and little snags on the assembly. " Be patient Grasshopper "
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Old 09-27-2022, 06:17 AM   #145
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Re: 400/406 Builds

Wow! That looks like a mighty Small block! Nice work!
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Old 09-27-2022, 11:06 AM   #146
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Re: 400/406 Builds

Looks awesome!
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