petiepye

Hello, I am new to this forum and this is my first post. My question is concerning an engine in a car I just bought. Is there any way to tell if the engine has a 350 or 400 crank by looking at it externally? I know it a freshly rebuilt engine as advertised, but there is conflicting info on whether it is a stroker or not. It is an 010 350 block, said to be a 383 by the guy I got it from but another fellow said to know the engine build says he's not sure if it has a 400 crank or not.
I would really like to know on way or the other without tearing it down if possible.
Thanks in advance, Pete

lookingaround

if its not balanced you can look at the balancer if its a 400 it will have a groove cut in the back part of the balancer about halfway around it

zipper06

If it's 383 it has to be an after market crank, becauce the main jurnals are different size on a 350 blk and a 400 blk.(2.450/350---2.650/400 mains.)
But it's still hard to tell because some after market cranks are internally balanced. If it's an after market crank with ext. balance it will have as before mentioned a counter weight in the balancer and a counter weight on the fly wheel like a 400 blk/motor.

Zip.

fla1976

I think the only way to know for sure is to pull the pan. Then you could figure out a way to measure the stroke. It shouldn't be too hard with a quarter inch difference. The block would probably have to be ground for clearancing also.

coreyh

If it is a stock 400 crank ground down to fit in a 350 block and if it is externally balanced it would have a weighted balancer and the stock crank would have a pin for locating the external balance flexplate on the rear flange of the crank. If it is an aftermarket crank and internally balanced you could possibly contact a local dirt track tech guy, alot of them have access to a cid pump and you could verify closely your cubic inch that way with out disassembly.