hi, can anyone tell me what number heavy duty thermal (not severe duty)hayden fan clutch will fit my 67 327 ? thanks for any help.

The Hayden catalog list the 2710 (thermal) or the 1710 ( non-thermal ) for the 64 to 68 327 CID Chevelle. That covers both 18"and 17" fans. Hope that helps.

thanks bill, i guess they don't make a heavy duty thermal for early short pump small blocks. i ordered the 2710. thanks again