need help on Dart Block/harmonic balancer

[muddslide]

I searched other posts and didn't find the answer. First what year did ford switch from the 28oz to the 50oz balancers. I currently have a 87 302ho motor in my 67 but I'm building a dart block in a few weeks. Can I use my 50oz balancer and flywheel on the new dart block or does it depend on what the crank is balanced at. The major problem I have is I bought the rotating assembly new/used. The person who I bought it from can't remember what the crank is balanced at. He bought it from Wynne Speed but when I called them, their numbers don't work....So I thought all 87 and up blocks were balanced at 50oz...Please tell me I'm correct...

 

[bmo37]

81 and newer mustangs were balanced to 50oz whereas prior versions and 351w's where a 28oz balance, you really need to know what the crank was balanced to if your wrong than you'll shake the engine to death and it will explode. your taking a gamble on a guess if you use your old 50oz, cause u don't know what it was balanced to, can be 0oz, 28oz, or 50oz.

 

[muddslide]

Thanks, I guess I have to have it rebalanced to find out the weight or is there another way

 

[Rick 91GT]

Any decent machine shop should be able to tell you what it is balanced too based on the harmonic balancer, and or flexplate/flywheel.

 

[muddslide]

The block is bare and have never been assembled, I guess I will have to take the crank to the machine shop and have them check the balance.

 

[bmo37]

yeah like rick said any reputable shop that does there own balancing should be able to tell you

 

[muddslide]

I was just trying to aviod paying the 200.00 dollars to have the balance checked.