I have a 67ss with A/c and now with a 402. I have installed the correct short water pump. I purchased a 7 blade clutch fan that is supposed to be correct for 67 big block with a/c. It was too large for my existing plastic shroud. Shroud fan hole measured 19" and the fan is about 19.3 at largest point. I purchased a supposedly "correct" shroud from OPGI as they told me the hole was 19.5". The shroud I got was the same as the one I had with the 19" hole. Tech at year one told me the correct fan was a 5 blade, 18" diameter unit. My question is what fan is really correct? Also the SWP will accept either small or large bolt circle diameter fan but the correct pulley (which I have) is small diameter bolt circle (1.75').

No knowlage of 67s. 70s small block fans are19"--70 BB fans are 18". A lot of 67 owners on this site ,someone will have the correct info. BB 70 fan W/AC
3947772 Bob

As per the '67 Features and Specifications Manual, the standard fan for non a/c cars is a 4-blade, 17.6" fan. Cars with a/c, or simply cars with the optional K02 temperature-controlled fan, came with a 5-blade, 18" fan.

The large 7-blade affair you were sent sounds like a later style, but I'm not sure offhand if the switch came in '68 when the crossflow rad replaced the downflow style, or in '69 when the long waterpump came along.

Thank You for the information.