I'm in the process of building a 1972 BBC 402. everything is going fine with the project, that was until I had the crank checked. Turns out I'm in need of a crank. It was a cast crank anyway, so I'd like to pick up a forged crank for the right price.

My question goes something like this! I've found a guy who's selling a forged crank for a 396/427. I happened to ask where's the rest of the motor (he also has a set of rods) is. Then apparently he says it all came out of a 366 (bbc). Can anyone explain this better? I was under the understanding that these cranks were internally balanced but they all had different weights, can they be interchanged!

In the books I've checked, looks like all the 366 Blocks were 4 bolt mains, so might they also have had forged cranks too. As another twist I then found a guy that has a complete running 366 engine running that I can buy for $100 less than the crank the 1st mentioned guy has.

Budget is the key word here, I'm fully aware that I can buy an Eagle piece and I'd love too but I blew the budget for this year on the "NEW" aluminum heads.

Thanks for any advice you can pass along!

Indynut

 

Is the 366 a late model Gen block? If it is, it wont work with a Mark 4 block.

 

The 366, 396, 402, and 427 all had the same 3.76" stroke. They are all internally balanced. The 366 was a medium duty truck engine, only. I believe it is a tall deck block. The balance difference will be minor. You're going to have the finished engine balanced anyway, right? Double check with your machine shop, just to be sure.

RACE ON!!!