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Author Topic:   400csb VS. 400 destroked???
posted September 22, 2002 11:00 PM
my guess would be i would go with the 350 rods and crank i think that makes a 377 i havent had the chance to see one run but i have heard there demons starting to build one my self,what part of ky u from im in southeast,ky

posted September 23, 2002 03:29 PM
Lets see if I can get this correct, yours is a 377 and has low end tourqe, good for getting off the corner. A 350 with 400 stuff in it is a 383, good for winding them up to 8000-8500 rpm. Good for long tracks

posted September 23, 2002 06:50 PM
Ain't that the other way around? 377's are hi-windin and 383's are torque monsters!

posted September 23, 2002 07:00 PM
tilley88 is correct. 377's will live longer at high rpm's and 383's generate more low end torque.

turn a cast crank and stock rods 383 to 8500 rpm and you'll need some buckets to get it all home after the explosion.

posted September 23, 2002 08:14 PM
A 383 is a 3.75 in stroke crank (stock 400 stroke) in a 350 block. The 377 is a 3.48 stroke crank (stock 350) in a 400 block. The rod length has nothing to do with changing the cid of a motor. That can only be changed by increasing or decreasing the cyl bore or by changing the amoutn the piston moves in the bore (crankshaft stroke). The rod length just changes the placement of the wrist pin in the piston. Take a look at a piston for a 400 using a 6" rod. The oil ring just barely clears the wrist pin.
I believe the long rod 400 is the way to go.even if it's just using stock 350 rods in the 400. They just make a whole lot of torque and you can degree your camshaft to where your power curve is at low rpms and not have to spin the motor so hard. The trick is to make the car hook that power to the track! Someone once said that the only thing better that cubic inches is cubic dollars! I agree!!!!!!

[This message has been edited by Eljojo (edited September 23, 2002).]

posted September 24, 2002 09:34 AM
Run the 400 ,its a good engine just dont wind it up too much,and when it does go, build a different engine.

posted September 24, 2002 12:59 PM
You're basicly on target ODB93. But think about it, if you've got a light car which doesn't take a whole bunch of power to get moving off the corner-you want to have a motor twisted up while in the corner-(low gears and high rpms) But-if you've got a heavy car which, because it is heavy, doesn't get thru the turns with a lot of speed, You'll have to have the torque to bring it back up to speed on corner exit. There are a lot of GM parts that hold up well when not moving at eight thousand rpms-if you want to turn that kind of revs, you'll want to buy the best of everything--I just purchased (today) a set of speed-pro hyoer pistons to mount on a set of 5.7 x rods. I plan to bolt them to a good (balanced) stock crankshaft and top them with a set of humps. I think I can have a very powerful, low cost motor, that will last next season--as long as I maintain it and keep the revs under 6800.

posted September 24, 2002 05:20 PM
Ok then the jo jo (eljojo) then with a 82 regal. That is not very heavy. THey way to go is the 377. I can do that.

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