Hi,
There are two rod styles for TR6, early and late. The late rods appear
with the change to CF / CR comm. numbers.
The early rods are "better" if you're building a race engine. This is
according to a reliable source with credentials in materials science.
All TR6 cranks are forged. EN40, if I recall.
If your motor has three early rads and three late rods, there's probably a
story there unless you have an early CF / CR block in which case you have
"the luck of the draw"...
Also, if you have different rods types, I'd make sure the dynamic balance
of the motor is good - there's a difference in the weight of the early and
late rods. ;-)
regards,
rml
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