How restrictive is a double heatercore?

[CoW]8(0)]

Compared to the more conventional radiators like the BIX II or MCR220 Quiet Power, how restrictive is a double heatercore (with respect to water flow)? More specifically the one I'm using which is a 77' Bonneville no A/C heatercore sold at dangerden (http://www.dangerdenstore.com/product.php?productid=48&cat=14&page=1).

 

[Bbq]

Less restrictive.

 

[DFI Daishi]

restrictive to air flow or to water flow?

 

[CoW]8(0)]

Good point, I meant water flow

 

[DFI Daishi]

par with the BIX2, slightly less than the MCR220, more than the PA120.2