1960 BIRD OEM asm used an 18" fan. If the repro shroud is molded the same as the OEM, the fan should work fine. If the mounts were weak, the fan would also contact an original shroud. You of course would ascertain that your mounts are good and there is little engine torque movement.
The flex fan you are looking at is a good choice (IMO) as it is much lighter than the stamped steel OEM fan and does not require a fan clutch. Both are a strain on the WP bearing and rob top end HP. This fan also flexes it's blades at RPM so that it does not draw HP @ road speed.
I think the vendor is trying to protect his butt with his disclaimer. But you have to ascertain if the fan will have enough clearance at assembly.
The flex fan you are looking at is a good choice (IMO) as it is much lighter than the stamped steel OEM fan and does not require a fan clutch. Both are a strain on the WP bearing and rob top end HP. This fan also flexes it's blades at RPM so that it does not draw HP @ road speed.
I think the vendor is trying to protect his butt with his disclaimer. But you have to ascertain if the fan will have enough clearance at assembly.
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