what year 400ci motors crank will fit in a 1970 olds 350 ?

are they the same engine family ?

or is a 383ci olds not possible ?

 

Doesn't matter what year it is, a 350 is a 350.

Neither one is a direct bolt in, because the main journals are larger. Same reason a Chev 400 crank will not a bolt into a Chev 350 without grinding the mains down.

With your stock bore, an early 400 crank would make it 412 CI, and a late one would take it to 440 CI. If it was worth the effort, it would already be common practice, and you would not have asked the question.

Yes. Same block, just different deck heights and crank journal sizes.

More than possible. Any competent engine builder can handle it. It is what they do.

Question is, why?

Norm

 

That sounds like Chevy talk
If you want to get into that kind of voodoo you may wish to use the 350 Diesel block, which has BB sized main bearings. Have your 425 crank cut to use your Chevy rods, and custom pistons.

Others have done this with good success. $$$$$ though.

A less expensive alternative would be a 403 with a forged 330 crank and pre-73 SBO heads. Cubes and a strong crank.

Be sure to use a halo girdle

http://www.ebay.com/itm/Oldsmobile-M...3f4849&vxp=mtr

:-)

 

Agreed with Octania, if youre looking for more cubes a 403 or 455 would be your best bet. Which one is your call depending on what youre looking for, 403s have massive bore and short stroke (4.351x3.385) and 455s are the exact opposite with smaller bore and massive stroke (4.125x4.25). Both have their weaknesses, 403s have weak mains and 455s have oiling issues, both have fairly easy cures. The 403 is essentially a 350 bored way way out

 

Another 4 yr old thread?

 

Octania, what gives? You've done this at least three times in the past month or so.

- Eric

 

must be bored lol.