which flywheel inbalance?
 

This may be a dumb question but with my 331 stroker im building i need to know which inbalance (0, 28.8, or 50oz.) to use for a flywheel so i can buy the right one to have when i get the rotaing assembly balanced.

I know for my year of car that it's a 50oz inbalance on the stock flywheel... Will that change with a different crank? Or will the people balancing it add the weight to the flywheel. Im not real familiar with externally balanced engines.

i am prety sure it is still a 50..but the 347 is a 28..***** my minds gone blank..dont quote me on that

You can get it ballenced to what ever you want. 0 would be the best for a race engine and 50 is fine for a street/strip motor. If you want to ballance it to 0 it will cost allot more because they will have to use allot of "heavy metal" on your crank. My 347 is a 50oz and it was a mistake I made when doing my engine. I spin it to 6800 causing increased ware on my mains from the 50oz counter ballence. I wish i did 0.
Wade

Well ive been looking around and pretty much all the 331 rotating assemblies say to use a 28oz offset flywheel. So i guess i will go for 28, its going to cost me a lot more to go 0 ballance and get a ballancer for an internally ballanced ford engine.

Just a street car project anyway.

THanks for the help.

Go with 28oz.
 

28oz is the way to go. You can balance it to 50oz, but will require a lot of drilling on the crank - makes it look like swiss cheese! :D Stick with 28oz for your application. This comes directly from Tom Naegle at DSS.

I took my entire stroker package (rods, wrist pins, pistons, crank, alumimum flywheel, Fluidampr, etc) to Fowler's Engines here in Columbus for the balancing. They also said 28oz was best for my 331.

Hope this helps.
E

BTW - if you get an aftermarket fly, it should come with weights in 50, 28, and 0 increments for balancing purposes.

I think the 50oz imbalance works great if you run a lightweight piston and rod combo. The further away from the crank centerline the weight is placed, the less overall weight you can run. Zero balancing often requires adding mallory to the crank, as Wade mentioned. This makes the whole rotating assembly heavier. In effect, if you were to take a 1 pound weight off of your flywheel, it may take 1 1/2 or 2 pounds on the crank to make up the difference.

IMO, having less weight is more important than where the weight is placed.

Andy