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Old 03-20-2010, 11:54 AM   #1
ROYO
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sbc 400

OK engine guru,s I would like some specs on a Chevy 400 on parts or modifications to make torque and a little power it will not be turned past 5000 rpms thx
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Old 03-20-2010, 02:40 PM   #2
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Re: sbc 400

If you can live with these numbers, you want a 400 S.B.

525 foot pounds of torque and 428 Horse power all at under 5500 RPM. AND,,,,, all at under $4500.00

Now If you have the main journals ground down on the 400 crank, you can put that crank in a 350 block and come up with a 388 S.B. I ran this combination with a blower on it and totally loved it.

any S.B. High Performance item can be used on the 400, It is all the same dimensions as a S.B.. the only major drawback is it is a Siamesed cylinder engine which can cause overheating issues. Any heads that you use other than factory Must be drilled to match the cooling holes between the block and head, (any machine shop will know all this)


But this is a build up that I've had my mind on for quite a while..

http://www.chevyhiperformance.com/te...que/index.html
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Old 03-21-2010, 08:35 PM   #3
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Re: sbc 400

Quote:
Originally Posted by ROYO View Post
OK engine guru,s I would like some specs on a Chevy 400 on parts or modifications to make torque and a little power it will not be turned past 5000 rpms thx
If you aren't looking to spend too much money, I'd go with 882 heads (easy to come by, great low and mid lift flow numbers, and they have big 76 cc combustion chambers which are good for keeping compression reasonable for bigger inch engines like 400s) I'd use flat tops and set the quench distance to about .050in (this will give you decently high compression and still maintain the ability to use lower octane gas, like 87 octane) I'd use a cam with no more than 224 degrees of duration @ .050 and I'd use a decently wide LSA around 113-114 degrees

If you have money to spend I'd most definitely to with AFR 180cc Eliminator heads (the best flow numbers you will find on a 180cc head) the 180cc runners in combination with AMAZING flow numbers will give you lots of port velocity and thus lots of torque, plus you can buy these heads with a large 75cc combustion chamber as well. I'd use a hydraulic roller cam with as much lift as possible (these heads will take up to .600 valve lift) I'd keep a wider LSA as stated before, and with a hydraulic roller i'd go with less duration maybe around 222 degrees @ .050 (my reasoning is because the duration numbers at .1 .2 .3 etc inches of valve lift will be higher and give you lots of streetable low end torque.) again I'd do the same thing with the quench distance and flat tops.

def use a dual plane intake, and use long tube headers with thinner primaries (like 1 5/8)
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Old 03-21-2010, 08:43 PM   #4
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Re: sbc 400

if flat tops give you too high a compression ratio, use D shaped dished pistons (this way the flat part of the piston comes close to the quench area of the head, this coming close causes turbulence or a "shockwave" in the combustion chamber which cools hot spots preventing pinging and knocking. Don't go tighter than .035 and don't make it any wider than .060 if you the engine to perform to it's potential with decently high compression and still not ping or knock. my source: http://www.speedomotive.com/t-showbymodel.aspx
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Old 03-21-2010, 09:35 PM   #5
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Re: sbc 400

Thanks keep them coming guys
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Old 04-03-2010, 07:41 PM   #6
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Re: sbc 400

Yep it was ready to run lol








see the rocker arms missing he mailed them to me

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Old 08-30-2010, 06:50 PM   #7
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Re: sbc 400

I am really loving the 400 I just installed in my 69.
I drilled all the steam holes in my 882 heads and it runs cool as can be and the engine run's like a dream.
Mark
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Old 09-03-2010, 08:33 PM   #8
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Re: sbc 400

400 's are my favorite small blocks. Almost identical bore and stroke to a 396 (.01 less stroke) Because of the siamesed cylinders (454's have "em too) some had problems with overheating but I had one in a 62 1/2 ton I drove 50 miles round trip to work everyday for 2 years with a stock 283 radiator and had no problems. As you probably already know, your 817 block was used from '70-'80 and early ones had 4-bolt mains. (first 2 years, I think) Your heads, if stock, are probably 1.94/1.5's with 76cc chambers. Since it's running below 5000 rpm "high dollar" heads may be a wast of $. I'd go with vortec heads (don't know your budget) but if you use your stock heads have them checked for warpage, if it ever has been HOT they're probably are. Use as much CR as you can for your altitude, 10-1 is probably a good pump gas friendly goal for Tenn, maybe a little more. Good duel plane intake, 650-750 carb and you should have a good "budget" torque monster. Cams are "tasters choice". If you ask 10 people you'll get 10 different answers. I like about .450 lift and 220* -230*@ .050 with about 110*-112* LSA but remember most manufactures rate their cams for a 350 so a 400 will bring down their ratings (about 500 RPM or so) as well as mellowing out the idle charistics, same with intake manifolds, take off about 500 RPM.
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Old 09-04-2010, 02:43 AM   #9
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Re: sbc 400

Thx for the info. I have,nt got a chance to do anything with it yet. On the vortec heads is there a casting number that is the best heads
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Old 09-04-2010, 09:36 AM   #10
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Re: sbc 400

HERES EVERYTHING YOU NEED TO KNOW
http://www.nastyz28.com/forum/showthread.php?t=56505
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