ok what all would need to be done to a 400 block with a 4" crank to make it work?


also what could I expect out of it with just a mild build up?

 

You need rods that won't hit the cam, a bunch of grinding on the block, and some expensive parts.

Personally I've never built a 427, only a 434 (.030" over); more than likely that's what you'd really end up building, unless you get a new block from somewhere.

 

You can't do it with a stock block. You need a raised cam location block and a small base circle cam. So it will cost $4000+ for block and crank.

 

You've obviously never done it.

I have.

It can be done with a stock block and a std cam. The one I used was a 509 block, and the cam was an off-the-shelf Comp XR282HR. I may even do it again for my own car this time.

 

Really thats pretty good then! I hope he has the same luck if he tries. I'm sorry i guess you don't need a raised cam block, but i am pretty sure you will need a small base circle cam.

 

i thought he was talking about a Small Block Chevy, not a BBC, but if im wrond it would only take a nice destroke, like a 400 block and a 350 crank, = 377 sweet engine.

 

I'm also talking about a small block Chevy....

 

.

 

I cannot get this thing to accept a pic....

If I could, it would be a 509 casting small block. (Casting number, not CID)

 

The 427 SBC is a standard bore 400 with a special 4" stroke crank. The 434 is the same except for a .030" overbore. Using an aftermarket block you could even build a 454 SBC.

Personally I wouldn't spend the money to build a large SBC with a factory block.

Don't forget that to feed any kind of 400+ cid engine you'll need some good flowing heads. The best production SBC heads don't flow as much as the worst BBC heads trying to feed the same size engine.

 

I'm in the process of building a Smallblock 427 & I almost have it finished.
Stephen 87 IROC is right, a factory block will work, but it is not a wise choice. The better choices are IE: GM Bowtie, Dart Iron eagle or little M, or a world products block. The aftermarket blocks take some clearancing, but not nearly as much as a factory block would.
An aftermarket block that has a tall deck height & raised cam location is not necessary, it will allow you to use a cam with a larger diameter and give you more clearance between the rods & cam, But the timing set & cover and all of the other related special pc's are very expensive. I used the Dart Little M, it has the regular height deck & std. cam location, but as I said before I had to use a cam with a small base diameter. I am using a 4" stroke crank w/ a bore diameter of 4.125".
Just as Stephen stated;Great flowing Cylinder heads are a must for a large C.I. smallblock.
I mostly wanted to be different, but it comes with a price, the the 383's & 406's can be built without breaking the bank, but when you start adding more C.I.s boy does the price raise!

Bruce (70GTO)

 

Yea Stephen but this way you have an excuse to get those 32 valve quad OHC heads that are on every dreamer wish list

Dont need a small circle cam then. I seen the build for a 454 SBC with a standard 400 CID base block $$$$$$$$$

 

This month's Chevy High Performance has a reasonable article on building big-inch small block engines. You might want to grab a copy. It also has an article on building a solid 12-bolt rear axle, which you'll probably need with the extra torque.