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Do you need forged pistons to use nitrous?


And what is the advantages of building a 383 to a 400?
 

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Yes and no. How much nitrous? and how long do you want it to last? Hyperutectic pistons will fall between cast and forged in price and durability, but will allow much tighter tollerances. If it's a lot of nitrous you want a forged piston with the ring package moved down and larger ring end gaps.
 

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A 383 is basically a 350 with a 400 crank. A 400 has a larger bore than a 383. stock 400s have shorter rods than 350s which gives them a terrible rod ratio and are externally ballanced. 383 and 400 can be custom built with long rods and internally ballanced.
 

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400 blocks are getting harder to find.
 

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400 blocks are hard to find and they always had a bad rep of overheating and cracking and had problems with core shift. Take a look at one sometime you see it looks like the camshaft bore area is off center. Cams use to go flat alot. So the solution was put a 400 crank in a 350 block. Have the benefits of torque but not all the problems.
 

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Take a look at one sometime you see it looks like the camshaft bore area is off center. Cams use to go flat alot
Now you're just spreading more internet B.S. about 400's--why would a cam in a 400 go flat faster than a 262, 265, 267, 302, 305, 307...............??
I have a number of 400 blocks with perfectly centered cam bores, which doesn't have any effect on if the cam will go flat anyway.
 

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The myth of 400s overheating is due to people changing the heads and not drilling the necessary steam holes in them. The siamesed bores in a 400 need coolant flow through this area.
 

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Cam lobes go bad because of the junk cams used in the 70's smog engines not 400 blocks, as for stock pistons they should be ok with a 75-100hp NOS hit thats it, both 383 and 400's are great engines for hp and tq, pick one.
 
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