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my old 76 has given up the ghost on its harmonic balancer. i tried the parts stores but the "pros" there just look at me like my lab does when i get made and scream at her i would appreciate any help thanks in advance
First off, you have a harmonic damper and not a balancer. The inline six is balanced by design.
I used this fellow -- top notch rebuild for like $50 or so. I think he may even exchange cores so you don't have to wait so long.
Do bear in mind -- different years had different locations for the timing marks -- I swapped a 300 3 ring onto my 240, and then I had to find TDC all over again, which was a PITA. But the damper is fine, damper doctor is highly recomended.
When I parked my '71, the damper on the 240 traveled in a oval pattern. It also overheated like a son-of-gun. Would be nice if a new damper would be the fix and not something more serious($$).
There is sponsor here that rebuilds them. Also dorman products makes a three groove harmonic balancer for the 300. Pioneer makes a balancer for the late 300's with the flat serpentine belt. Hope this helps.
You want to be careful the Oreilly catalog showed the Pioneer as fitting my 1984 three groove didn't bother to check until I got it home and it was for the serpentine belt. Called Pioneer and they said they don't make one for the vbelts. So the catalogs at O'reilly's are wrong.Got the Dorman form the local mm and pops parts store and it was right.