400 with RB rods ?

[tim foyt]

Hello, if you use the longer RB rods with a piston that comes to zero deck in a 400 B engine, does that increase the stroke? Thanks,Tim.

 

[Meep-Meep]

Rod length will not increase the stroke in any engine - ever. What it does is affect the rod to stroke ratio, which changes the engine characteristics.

I would definitely use the 440 rod with the 440 stroke to retain the factory 440 rod/stroke ratio.

 

[rumblefish360]

You didn't mention useing a 440 crank, just a 440 rod in a 400.

like what meep meep said. The rod ratio changes to what is currently thought as a better way to run a set up. The new rod length may require a serious search for a piston or a custom set. (Ka-Ching!)

 

[daredevil]

440 crank and rod in 400 is 451 recipe

 

[Moparteacher]

Yes. Use the long rod in the 400. Diamond has pistons on the shelf. $600. through Mancini.

 

[rumblefish360]

Mancini has 400 pistons with use of a 440 rod? Are you sure?

 

[godfatherofchry]

what is the length of the two..??

 

[74sundance]

The 440 has a 6.760" rod and the 400 has a 6.358 in rod.
The 400 ends up being about about 60 pounds lighter and has the biggest bore of any Mopar. (4.340) The rod journals are the same,but the mains are smaller (2.625) vs. (2.750). So you will need to have the mains turned down to the 400 dimension,then you have to bore it .030 to get 451 cubic inches....But don't use the .030 bore size: a 4.370 bore is very difficult to find rings for. Use .040 pistons and use the +.060 440 rings. (4.380). Use the 400 rod (the rod ratio is still 1.70) and there is an inexpensive piston now available from Keith Black, the KB 215,for $374.99 from Summit.
You will have a lower rotating weight, the lower deck height allows for a more compact piston which in turn reduces the piston weight significantly. The longer 440 rod and longer stroke of the 440 crank also means that a 451 has lighter pistons than a stock 400. The typical piston/pin/rod assembly in a 400 weighs 1930 grams. The same assembly for a 451 using stock 440 rods weighs 1630 grams. (This can be made even lighter by using 0.990 pins) The reduction of 300 grams per cylinder means a weight reduction of 2400 grams, or 5.3 pounds from the assembly. An additional amount must be taken off of the crank counterweights to balance the motor. This amount is 1060 grams or 2.33 pounds for the above configuration. That means that the 451 rotating assembly is 7.6 pounds lighter than a 400.

 

[godfatherofchry]

very educational thank you I have never played with any 400s I have been around sum 451s that ran very well some day id like to bild one... thanks again Artie

 

[YY1]

What happens if you don't bore the cylinders? can you keep the stock 400 bore, and still get pistons? What would that displacement be?

I'm currently looking for a 400 for my factory 383 66 Coronet, and want to explore my options. I have the original block, which I would like to keep out of harms way. I would like to find 452 unleaded heads, and have always thought the 400 to be an underrated engine.

Looks like I can get my heads and a buildable block in the same shot.

I want to build something that will run on 89 octane and maybe dabble in the 13 second area at the strip.

I used to have a 70 Super Bee with a stock 400 out of a van and a 3:55 rear that would do low 14's all day.

 

[rumblefish360]

For what engine combo?The 451 or the 440 rod in a 400?

What happens if you don't bore the cylinders?

Then the bore size stays the same and pistons are order for the bore size. This assumes the bore is good for use.

can you keep the stock 400 bore,

Why not?

and still get pistons?

Why not?

What would that displacement be?

For what combo again? The 451?

I'm currently looking for a 400 for my factory 383 66 Coronet, and want to explore my options. I have the original block, which I would like to keep out of harms way. I would like to find 452 unleaded heads, and have always thought the 400 to be an underrated engine.

Looks like I can get my heads and a buildable block in the same shot.

I want to build something that will run on 89 octane and maybe dabble in the 13 second area at the strip.

I used to have a 70 Super Bee with a stock 400 out of a van and a 3:55 rear that would do low 14's all day.

Good luck, there out there. A 400 has the cubes to be a decent runner. I know KB has a few different kinds of slugs for these engines. A 9.0-1 ratio should run 89.

 

[YY1]

This would be for a 400 with a 440 crank.

Sorry. I seem to have semi-hijaked the thread.

 

[gearheadbill]

400 block

For those that do not know.the 400 block is the choice for many builders especialy when your after the BIG HP BLOWN ENGINES,THE BLOCK IS JUST A STRONGER CHOICE.
Bill

 

[moparstuart]

For those that do not know.the 400 block is the choice for many builders especialy when your after the BIG HP BLOWN ENGINES,THE BLOCK IS JUST A STRONGER CHOICE.
Bill

great choice to build a stroker , :yes::yes::yes:

 

[Cranky]

Even a stock stroke 400 with an RB rod in it and the right piston for a good deck height makes for a good running engine....so long as you 'pick' the right combination of parts to compliment it but that's true in any engine build. Too many people don't research a combination for the best results and the whole car is part of the combination.

 

[dodge41969]

call 440 source, they offer several stroker kits for 400's, they have the cranks & rods separately too,

or the "complete rotating assemblies" for $1,997, that includes all new parts: crank,rods,pistons,rings,bearings & a balance job.

[email protected]

 

[nosman]

I am building a 470 stroker. I bought a 470 kit from indy. I also bought indy ez-1 heads and a indy intake. I have a small problem my block was bored .030 over so i am praying that he can hone it clean. So i might need a block or i will have to have pistions made. Some je for another 750.00 this thing is killing me!!!! So if any one has a good block not cut .030 over 1973 or does anyone need some nice .030 wieco pistons rings and pins let me know. Thanks kenny 859-816-1497

 

[Redhorse719]

The 440 has a 6.760" rod and the 400 has a 6.358 in rod.
The 400 ends up being about about 60 pounds lighter and has the biggest bore of any Mopar. (4.340) The rod journals are the same,but the mains are smaller (2.625) vs. (2.750). So you will need to have the mains turned down to the 400 dimension,then you have to bore it .030 to get 451 cubic inches....But don't use the .030 bore size: a 4.370 bore is very difficult to find rings for. Use .040 pistons and use the +.060 440 rings. (4.380). Use the 400 rod (the rod ratio is still 1.70) and there is an inexpensive piston now available from Keith Black, the KB 215,for $374.99 from Summit.
You will have a lower rotating weight, the lower deck height allows for a more compact piston which in turn reduces the piston weight significantly. The longer 440 rod and longer stroke of the 440 crank also means that a 451 has lighter pistons than a stock 400. The typical piston/pin/rod assembly in a 400 weighs 1930 grams. The same assembly for a 451 using stock 440 rods weighs 1630 grams. (This can be made even lighter by using 0.990 pins) The reduction of 300 grams per cylinder means a weight reduction of 2400 grams, or 5.3 pounds from the assembly. An additional amount must be taken off of the crank counterweights to balance the motor. This amount is 1060 grams or 2.33 pounds for the above configuration. That means that the 451 rotating assembly is 7.6 pounds lighter than a 400.

I'm building a 451 street engine using KB 280 at .030 over and had no problem finding rings.

 

[Cranky]

470 cubes in what block? Did you know you can offset grind a 440 crank to get 470 cubes? You'll end up with 2.200 rod bearings so you'll need to get different rods.....

 

[nosman]

Cranky it is a 400 block the good news the block honed out.so i don't have to buy a block or buy costume pistons. I have a eagle 3.90 stroke crank and eagle 6.76 h beam rods and 4,375 wiseco coated pistons. My new problem is the might have to cut my pistons down to get 10.7 to 1. Just need a little more luck to get this motor done. He will let me know this week. So i am going to church sunday. I don't know what that cost. But it sounds bad nosman