the funny thing is you can blow through it, it just only goes through the 1st inch or so.

final update. after all the f-ing around, i figured it out. i bought a brand new custom evap core for this project. the core was partially obstructed. when the system was working, only the 1st inch or so of the core would get cold. the rest would be room temp. sent it back and they made me a new 1. ...

it looks like a original type core with the inlet and outlet changed. i don't believe it's a parallel flow type. it's big.

the way the system is designed is that 1 fan blows through 2 separate sets of ductwork. a flapper door switches between them with no blending. so on hot all the air comes out the floor or defrost, and on a/c all the air comes out the dash vents. all that seems to work. i had considered the core free...

the condensor is cold and all the air is going through it. i sprayfoamed the core to the case so it's completely airtight. the way the system is, is 2 separate air ducts and vents and 1 fan. it even has 2 separate control heads for heat and a/c. i think it may need more airflow, but i'm not sure how...

UPDATE: installed a brand new r4 style compressor using the holley bracket. no other changes. the psi's look better and it will cycle on and off, but still only getting 20* temp change. engine running approx 1500 rpm. max a/c in recirc posistion heater core shutoff, cooling fan running. approx 80* a...

the r4 uses the same style blocks as the v7? thanks again guys. this has been very helpful.

thanks tim for the recommendation. that r4 unit seems to have a small pulley. what rpm is that safe for? what hose blocks are available?

thanks again.

wow. more good info. thanks again! what would be a good brand for a new r4?