4.00 inch stroke crank in a stock gm 400 block - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-03-2004, 08:21 PM
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4.00 inch stroke crank in a stock gm 400 block

Hello,

I was looking in one of my mags. when I noticed a 4.00 inch stroke crank for a 400 block instead of the standard 3.75. I was wondering if that stroke would work in a stock gm 400 block or is it for one of those aftermarket blocks? Also How much cubic inches would that be with a 400 block bored .030 with a 4 inch stroke?

Thanks

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Old 03-03-2004, 08:37 PM
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427 i think...i almost went for that crank..was told to much clearance would be needed
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Old 03-03-2004, 10:09 PM
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a SB 427 is 4.125X4.......400 block by 4 inch stroke
The 4.155 by 4 inch stoke is a 434.....
Can do with a stock 400 but work required.....
switch to megadollar block or go big block!
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Old 03-04-2004, 07:52 AM
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WWAAAAAYYYYY over YOUR head, dude!
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Old 12-04-2006, 09:00 PM
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I don't want to make waves but most engine bays that can take a small block can fit a big block. I know all this stroking stuff is fun but I wasted good money on stroking a 400 mopar to 451 when I would have been much dollar wise ahead building a 440. Granted the 400 block is shorter, lighter, and stronger than a 440 but I spent just under a $1,000 on custom JE pistons so I can use the 440 rods and get a good quench. My advice would be to build a 427 or 454 big block, they got strong components, way better heads, and a great foundation to build more power. Besides, whats going to be more stressed, a stroked out short rod 400 sbc or a 454?
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Old 12-05-2006, 03:51 AM
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A Ford 428 has a 4.125 bore and a 4 inch stroke. Go big block. The fomula for swept volume is r -radius(half bore dia) x r x 3.1416 x stroke x number of cylinders. A hot rodders best friends are a tape measure and a calculator.
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Old 12-05-2006, 08:43 AM
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The original post in this thread is so old that Moses knew the OP.

tom
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Old 12-05-2006, 11:12 AM
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Weeeeeeeeeel, since most of us have not been around as long as Moses I can understand how some new rodders as well as experienced rodders would have this same question from time to time. The only things you can probably gain from the 400 block is less weight in two areas. One is the overall weight of the engine compared to a big block in that is weight directly off the nose of the vehicle. The second is one most people don't consider and that is the weight of crankshaft between the small block and the big block. This weight affects the rotating inertia that ultimately starts with components rotating in the front of the engine all the way to the kind of wheels you have on your vehicle. However, the weight of the crankshafts may not factor as much as a big block head flowing roughly twice as good as a small block head.
Plunk the money down on the big block and work on the car as a whole package rather than an engine rolling on black rubber.
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Old 12-05-2006, 02:00 PM
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If you are after more power with a 400 sbc, don't stroke it. Just do a regular bore job and make a 406. Then spend you money on a good set of heads and a roller cam. Power is all in the heads. 434 cid will not make much power if your heads don't flow.

There are a bunch of 450 to 500 hp 406cid sbc build recipes on chevyhiperformance.com. And these engines are making over 500 ftlbs of torque.
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Old 12-05-2006, 08:37 PM
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Quote:
Originally Posted by IanRiordan
A Ford 428 has a 4.125 bore and a 4 inch stroke. Go big block. The fomula for swept volume is r -radius(half bore dia) x r x 3.1416 x stroke x number of cylinders. A hot rodders best friends are a tape measure and a calculator.
the fomula i got is bore x bore x stroke x number of cylinders x.7854
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Old 12-05-2006, 11:54 PM
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406's are good ecs. with 6" rods i building a 421 SB chevy now with 3.875 crank a 4" crank is really pushing it in a stock block can be done but 400's are a little thin in the wall area as it is and thats alot of leverage on a stock block 3.875 is pushing it
and as for people that have never experinced a stroked SB look out big power in a little package just look at the 454 SB chevy motor amazing to why anyone would want a big block now before you get screaming i like BB 's as much as anyone dependng on combo and how big you really need to go, i building my 48 pro street with intent of light weight big hp and hoping to get some street time out of it aswell as doing to track time id do a 3.875 crank you'll feel it in the seat of your pants trust me nothing like having the best of both worlds light weight big torque and good revs, and maybe build a 415 or even a 421 but not sure of your driving needs all this aside just get a good steel crank great place to start is Ohio crankshaft.com good guys very knowledgable hell a 406 with 6" rods ok i better quit its getting contagess lol
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Old 12-06-2006, 02:49 AM
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Hey Tom, what's your point? It's only 1976 in the southern hemisphere - and 1890 in New Zeeland.
Bruce, try both formulas and see how they relate.
On another subject, I've been showing some of the kids(under 30) at work how to degree in their cams as a few are building cars at the moment. They run about 50/50 ( jap junk vs V8s). Anyway, about a month ago I went to set up a comp cam in a 2002 LS1, looked at the p/n to find the wrong cam had been shipped by a small time ebay supplier in the US. Fortunately he swapped the cam locally as the supplier got real quiet.
Today - temp at 37c (bout 98f), bushfires 25 miles from my home. So I stay back to teach a ricer kid how to degree in the over priced cams and adjustable hks gears going in his mr2 turbo. I degree in the intake cam which is a fiddly job with little room for the dial indicator extention to run past the cam. OK so far - only 2 crank degrees out. Now the exhaust, I'm starting to question myself when it dawns on me that the grind is 8 degrees short @50 - 227 vs 235. Check the lift - it's 25 thou down. Yup, got the right intake cam, right spec card, WRONG exhaust cam - guess what, another small ebay supplier.
In the US I use Summit or Scoggin Dickey. In Australia I use Fabre, Rocket or VPW and so far only a delay in over length pushrods which is alledged to be Manley's fault.
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Old 12-06-2006, 11:51 AM
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GM 400?
which one?
pontiac 400 = 4.125 bore with a 3.75 stroke
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Old 12-07-2006, 02:55 AM
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Sorry cuz it's a 400 small block Chev. I grew up around a lot of blokes into Pontiacs and Buicks (plenty Holden V8s too). But bang for buck with everything here costing double what you pay it's a no show.
I'd love a stroked 409 Chev or a trick 472/500 Cad but it's bux again. My 30 over 400 with 220cc intakes, moly rollers etc owes me $5240 Aust including the 150 over length Manley pushrods that arrived today - after a 6 week wait. A similar Poncho would cost $12000 plus out here.
My favorite goats are 66/67 then 68/69, but my best friend since high school owned a bench seat (rare here) 70 350hp column auto GTO.We/it went through plenty together and he still goes to shows to see it with the bloke he sold it to in 1992.
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Old 12-07-2006, 08:55 AM
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Don't you have high performance parts manufactures down there in Australia?
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