Help me build a 400+ sbc. What would you build?? - Chevy Nova Forum
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Old 2nd-March-2008, 09:35 PM   #1
NovaRich
 
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Help me build a 400+ sbc. What would you build??

Here is what I am looking to do. I want to see what some ideas are for a build with only a few stipulations.

The stipulations:

Must use a stock 400 block (can be bored and stroked)
No spray in the build
Must run on 93 octane
Must use aluminum heads (preferrably GM fast burn)
The more torque/hp...the better

Let me know what you guys would do. Please be as specific as possible. I am considering going this route to get my car on the road faster.

Thanks for any help at all!
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Old 2nd-March-2008, 10:02 PM   #2
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Just like any small block chevy the sky is the limit to the number of combinations you can have. It all depends on your intended usage and amount of money you have to spend.

For a street car with a SBC I think a 406 is hard to beat. You can make it into a stump puller, drive all day or head to the track if you want. If you are not going to be turning any high RPM you should not have any problem with the stock crank and rods, just add some good rod bolts and get some pistons to give you the compression ratio you want.

I'm in the middle of a 421 which takes a 4.125+.030" bore and 3.875 stroke.
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Old 2nd-March-2008, 10:56 PM   #3
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Quote:
Originally Posted by Ironman View Post

I'm in the middle of a 421 which takes a 4.125+.030" bore and 3.875 stroke.
Are you building this from a stock 400 block? Can you give me some info on what components you are gonna be using?
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Old 2nd-March-2008, 11:17 PM   #4
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Sorry, I see your build in the other thread. Nice Build!
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Old 2nd-March-2008, 11:30 PM   #5
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I walked into a deal someone needed out of that included a GM 400 block with splayed caps installed, Ross flat top pistons, Perfect Circle rings, 6" Eagle H beam rods, and a Scat lighweight forged crank with a 3.875 stroke. I still need to get the block bored and the heads and cam on order. I'm going with a solid flat tappet cam, 254/254, 540/540, 106 and an aluminum head with around a 215 runner, 64cc, probably 2.05/1.6 valves.

The rest I have from the previous engine or have recently acquired, a Quickfuel 750DP carb, Professional Products hurricane intake, MSD ignition, Hedman headers, 1-3/4 primary, 3" collector, Milodon oil pan with the windage tray and kick out, and Paul Wrights pump on the way.
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Last edited by Ironman; 2nd-March-2008 at 11:36 PM.
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Old 2nd-March-2008, 11:33 PM   #6
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Quote:
Originally Posted by Ironman View Post
I walked into a deal someone needed out of that included a GM 400 block with splayed caps installed, Ross flat top pistons, Perfect Circle rings, 6" Eagle H beam rods, and a Scat lighweight forged crank with a 3.875 stroke.
So to get the 421, you only had to bore 30 over? What would 60 over be? Can you get 427 ci from a 400 block?
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Old 2nd-March-2008, 11:43 PM   #7
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426 CI or so with 4.185 bore if I entered the data right.
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Old 2nd-March-2008, 11:59 PM   #8
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Well, here's the build that we did, aluminum headed 406 that runs on 93 octane and goes like stink (estimate of about 500 hp or so)

lunati voodoo 60105, hydraulic flat tappet cam
Canfield aluminum heads (cnc ported)
Victor Jr. intake
1.6/1.5 int/exh roller rockers (summit brand)
mahle forged pistons, flat top
11:1 compression ratio
Summit brand distributor
electric water pump
electric fan
etc. etc. etc.

Runs on 93 octane with no knocking, goes like stink. It's matted to a 4 speed with 3.73's, breaks the tires loose on the freeway.
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Old 3rd-March-2008, 09:04 AM   #9
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Quote:
Originally Posted by 66IISS View Post
Well, here's the build that we did, aluminum headed 406 that runs on 93 octane and goes like stink (estimate of about 500 hp or so)

lunati voodoo 60105, hydraulic flat tappet cam
Canfield aluminum heads (cnc ported)
Victor Jr. intake
1.6/1.5 int/exh roller rockers (summit brand)
mahle forged pistons, flat top
11:1 compression ratio
Summit brand distributor
electric water pump
electric fan
etc. etc. etc.

Runs on 93 octane with no knocking, goes like stink. It's matted to a 4 speed with 3.73's, breaks the tires loose on the freeway.
This is exactly what I am looking for. What 4 speed do you have in the car? Do you know the specson the heads?
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Old 3rd-March-2008, 10:03 PM   #10
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You can make make a 427. Need a 4 inch stroke crank and 4.125 bore. If you go 30 over it is a 434. Curious as to why you are insisting on Fastburn aluminum heads? Do you already have them most 200 cc aftermarket heads are better. The Edelbrock ETec 200s are cheaper as well. I think even the Dart Pro 1s are cheaper and much better.
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Old 3rd-March-2008, 10:15 PM   #11
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Nova rich, bore and stroke, for the most part = cubic inch, heres a good site that shows all of the stock bore and stroke specs...
http://users.erols.com/srweiss/tablersn.htm#Chevy
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Old 3rd-March-2008, 11:20 PM   #12
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http://www.canfieldheads.com/sbc_2600.html

I'm pretty sure those are the heads. The engine was built by my father and I about 3 years ago, I don't have the information in front of me, this is all off of memory. I'm almost positive we went with the 220's, we got them because AFR's were darn near impossible to get around the time (at least 6 week lead time ).

4 speed is a Muncie M21, tires are old. It cruises down the freeway at 75 at about 3000 rpm (been a while since I've driven it, this winter stuf has got to go). This is right about where the cam starts to pick up power, if I floor it you get shoved back in the seat and away you go. 75 - 95 is pretty quick, car is very unstable after that.

Either way, it's a blast of a car. All this was done with the stock 400 bored 30 over, scat crank and eagle cap screw rods
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Old 5th-March-2008, 05:35 PM   #13
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Quote:
Originally Posted by tnblkc230wz View Post
You can make make a 427. Need a 4 inch stroke crank and 4.125 bore. If you go 30 over it is a 434. Curious as to why you are insisting on Fastburn aluminum heads? Do you already have them most 200 cc aftermarket heads are better. The Edelbrock ETec 200s are cheaper as well. I think even the Dart Pro 1s are cheaper and much better.
Didn't insist on the fast burn heads, just preferred it. I'll settle for any ALUMINUM head
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Old 6th-March-2008, 02:18 PM   #14
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TTT.....keep them coming. There are a lot of stock block 400 owners who want to know winning combinations.
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Old 6th-March-2008, 02:47 PM   #15
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Does anybody de-stroke 400 small blocks these days? I seem to remember this was the hot ticket... 400 block, 350 crank with spacer bearings to get 377ci. You could rev the crap out of this engine and it'd just sing all day long.

Nowadays it seems like everyone is going for big cubes... which is great for torque... but considering that a Nova is a light car, a high RPM motor would be fun - and help get you out of the hole with less tire spin.

Thoughts?
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