[Boxmaster]

Will connecting rods from a '66 T120 (70-3606) work OK with a '70 TR6? My parts manual shows 70-9525 as the part number, but a little research leads me to believe that the latter is a direct replacement for the former. Can anyone confirm?

 

[Wally]

Dimensionally they are the same, but the later rod is stronger due to the small end being beefier. Later rods are more plentiful and cheaper from what I've seen.

 

[Mr.Pete]

Before engine number DU47006 (1967),rods measured 0.550" wide at 1" below the small-end bush.After that,they measured 0.650" wide.
The later rods are stronger,but heavier.They have some effect on balance factor.

Those early rods would originally be fitted with 26 tpi rod bolts,that require 28 ft-lbs torque (dry).
From engine number HC23445,June 1969,UNF rod bolts were used and they should be torqued to 22 ft-lbs (dry).

If it's a low-performace engine,the early rods would work.I'd still give them a good polish and crack-test.Check the balance factor too,it might end up more than 85%.65%-85% will work OK.