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Old 08-16-2007, 08:14 AM
400smb_s10's Avatar
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Chevy 400 Stroker Build

I was wondering what I would need for my 400 Stroker build...

This is what I was thinking....

400 Bored 0.030 over

flat top pistons 9.5:1-10:1 compression

Scat 9000 Pro Comp Stroker Crank
Chevy 400
3.750'' stroke
For use with 6.000'' rod
Internal balance
2-piece rear seal

I havent found heads yet

Any Input on this would be greatly appreciated

Thanks

Ed

I would also like to know where I could buy the flat top pistons in a full set. Ive been looking at jegs and all they sell them in is Individuals.

thanks again

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Last edited by 400smb_s10; 08-16-2007 at 09:10 AM.
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Old 08-16-2007, 08:56 AM
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I just wanted to make sure you knew that you were destroking your 400 from a 3.75 stroke to a 3.50. Is this intentional?
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Old 08-16-2007, 09:09 AM
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No its not I ment to put the 3.75 stroke one on there sorry ill Edit it.
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Old 08-16-2007, 11:10 AM
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Your not really building a stroker if your not increasing the stroke. Your just building a 400.
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Old 08-16-2007, 11:15 AM
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Ok so what crank should I use to build a stroker?

Thanks

Ed
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Old 08-16-2007, 12:55 PM
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Let's start over at page 1.

A 350 is 4.000" bore and 3.480" stroke. (Stock).

A 400 is 4.125" bore and 3.750" stroke. (Stock).

A 383 is a 350 block overbored 0.030" for a finished bore of 4.030" and uses a crank with 3.750" stroke (either a 400 crank that has been turned down on the main bearings to fit into the 350 block's smaller saddles or a purpose-made aftermarket crank).

To build a stroker motor starting with the 400 block, you'll need a crank with a stroke longer than the stock 3.750" crank.

For instance, here's a 400 stroker kit that uses a 3.832" crank
http://www.speedomotive.com/ps-533-8...roker-kit.aspx

And one that uses a 3.875" crank....
http://www.speedomotive.com/ps-535-8...roker-kit.aspx

And one that uses a 4.000" crank (for use with aftermarket block....
http://www.speedomotive.com/ps-536-8...roker-kit.aspx

And one that uses a 4.125" crank (with aftermarket block...
http://www.speedomotive.com/ps-537-8...roker-kit.aspx
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Old 08-16-2007, 01:33 PM
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You can use a 4" stroke in a stock 400, you just have to clearance the block for the rods and use a small base circle cam and big cc heads to keep the compression reasonable.

You also won't get 6" rods in there, I used 5.875" rods and they were into the oil rings even though the ring pack was shorter than normal.

I'd expect someone would make a rotating assembly by now.

I did mine in the late 90's and no kits were available.

The speedo kits mentioned above look nice but lots o compression!
And the 6" rods work with tall deck or 'rocket block' motors only

It's pretty nice to have 400+ ft/lbs from 2400 RPM to 6000rpm

Keith

Last edited by 427v8; 08-16-2007 at 01:40 PM.
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Old 08-16-2007, 02:08 PM
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If you are wanting 6" rods with a 3.75 stroke, use h-beams as i-beams come too close to the camshaft as you will need as smaller base circle camshaft. As far as a full set of pistons, try JE, SRP, Wiseco, Ross or Arias pistons.
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Old 08-16-2007, 03:25 PM
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So if I got the stroker crank and used 5.7 rods would It be a safer way? Im really looking forward to building a stroker Im just having a little bit of trouble understanding the concept of it all... Is it more stroke = more cubes? and more cubes = more horse power and ft lbs?

thanks for the help so far its appreciated

Ed <-- newbie to the stroker world
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Old 08-16-2007, 03:39 PM
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I havn't built any 400 chevrolet's but I built a 428 pontiac and put it in a 1968 firebird. It has the same bore as a 400 with a 4.00 stroke. with a .030 overbore it came out to be a 434. It was a beast. I have pictures with both front tires about 6 inches off the ground with slicks. It only had 9.5 compression and I tried 87 octane in it one time without detonation, but I stayed out of the throttle. If they sell a good kit with a 4.00 stoke, that would be the route I would take. I promise you, you would have a painted smile on your face after your first drive. jtyler
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Old 08-16-2007, 06:29 PM
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Check out Competition Products!

They have full stroker kits, already balanced and ready to go!
415ci
421ci
434ci



Keep in mind that I had to clearance my block for Eagle H-Beam rods (and buy a special stroker pan with deep front end that barely clears the crossmember) with STOCK stroke of 3.75"
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Old 08-16-2007, 08:14 PM
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"Is it more stroke = more cubes? and more cubes = more horse power and ft lbs?"

Yes
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Old 08-16-2007, 09:39 PM
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Hmmm, looks like building a stroker 400 is not really worth the money. You can bore a stock 400 out .060 and end up with almost the same displacement as the first speedo engine kit @2 grand! LOL
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Old 08-16-2007, 11:08 PM
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A 400 block bored .060 is asking for cracked cylinders and a hot running engine. Most machines shops won't suggest going over .040 on a 400.
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Old 08-17-2007, 11:18 AM
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I would go with a 3.875 stroke crank in a 4.155 bore 400 block. There are a few of those used in mud racing and they do rap well for the added stroke. I know of a Tracker that uses this setup and it is very hard to beat. It runs good enough to compete with upper 500+ cubes and has enough power to turn 40" paddles even.
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