i have 406 right now that has a oil pressure problem. i took it apart and all of the mains were showing brass, except for the one under the oil pump, so i determed the cranck must have a clogged journal, keep in mind this motor was all freshly machined about 1000 miles ago. so heres my question, i have a new 350 crank and bearings, will those work in the 406 and what will be the effects, thanks.

 

You have to get spacers to use it since the main journals on the 400 crank are larger.

You have to get different pistons, or different rods to offset the compression height.

And you will be making your engine smaller in terms of CID. You will then have a 377. Not a bad motor, but you will lose HP and a whole lotta torque.

If you go to www.mortec.com , you'll see the differences in the crank journal sizes.

That's all I can think of right now, but IMO, that would be enough to shy me away from doing it.

 

Its a 400 bored 30 over so that would be a 383. Just thought I'd straighten that out. The rest is fairly accurate.

 

No. A 350 bored .030" over with a 400 crank (3.75" stroke) yields 383 ci.


A 400 (4.125") bored .030" over (4.155") with a 3.48" stroke will yield 377.5 ci if you want to get technical.

Maybe you're thinking of a 350 standard bore (4") with a 400 crank (3.75")? That's 377 ci, but just the other way around

 

LOL. I deserve that. ok so 3.78 because we round after 5. Anyway I'm not sure why I didn't add that up. For some reason I was thinking that the 400 bore was the same as a 350 but I looked and your definitely right

 

why not just get another crank 400 crank

 

He has "a new 350 crank and bearings". He said that in his first post. He wanted to know if he could use it. That's why he asked. I told him it would be a major PITA. How else is he gonna know if he doesn't ask?

 

no **** he said that. i neva said he didnt. trying to be the board super hero. if your building engines you should atleast learn alot about it before you start doing ****. especially the simple **** like what cranks can be used in what. and how many cid it'll produce

 

Did someone learn a new word today?

 

thanks aj for clarifying that, synthetic, its christmas time and i spent all my money on presents so im trying to save money, ill pobably end up having the crank turned, and cleaning the block out, also ill probably buy a new oil pump to be safe, thanks for everyones input