Did I get ripped off? 4.125 stroker crank into 400 SBC chevy

[sheboygan34]

Hello.. got a feeling that I was ripped off. I purchased a new eagle 400 sbc stroker crank that has a 4.125 stroke. The guy I got it from, says I can fit this into a factory 400 SBC block with some machine work, machined rods and 1.000 base circle cam. Even with these mods, I've been told it will not work at all. Can you guys offer any more info?

Thanks... A

[mytmouz]

I'm sure you'll get a lot of opinions from others on here, but I'll give you mine for what it's worth. I used an Eagle 4 inch stroke crank in my stock block. I had no crank fit issues whatsoever. I used Manley 6 inch length I-beam rods and only had to do some very light clearancing at the bottom of 2 cylinders. I think that the 4.125 would have worked in my application. I do think I would have to have done more clearancing if I used H beam or aluminum rods instead of the I beams. My combo has held up fine so far, but when I go through it I will try to upgrade to an aftermarket block.

[sverbus]

I used a Eagle 4" crank and Eagle H-beam rods with cap screws that are clearanced for stroker applications. you've got just a bit more stroke there so I would bet you'll have to do some work but I know for a fact that you can fit up to a 4.250 crank into a 400 block with stock cam location. You have to use a .900 base circle cam, but it will work. It makes the motor a 472sbc and that's my next beast in a few years.

Actually, I was told by Cam-Motion and Comp Cams (which is where I ended up getting my cam from) that it's in your best interest to run a .900 circle cam just to be save. Anything bigger might clear, but upon flex in the motor, you could have issues or something breaking in the motor.

I run a Dart Little-M block, but know of 2 guys I run with that have 434's in stock 400 blocks that have been a bit massaged. So I don't think you got ripped off.

Eagle does something a bit different than alot of other brands, they cut the cranks counterweights to either 5.7 rod or 6.0. So check to make sure you got one that will work with 6.0 rods.

[sheboygan34]

Thanks for taking the time to help me out.... A

[dadnova]

You may have some problems with the stock block holding up. I went to a Dart block and with a little machining it works fine. Now my problem is getting traction with my new 429. A problem I am now working on.

[dadnova]

However I forgot to mention I bought a raised deck block. Thats why it works.