Originally Posted by jarcher401
I read that with the higher flow of a 3 speed motor I would need a thicker core to slow the moving air down enough so heat exchange could take place
Sounds like hooey to me. I used my original core and the heater cooks......it almost exchanges heat too well!
'84 CJ-17: 17" stretch, locked Toy axles, 5.5" lift, FI, AX15, D300 w/twin sticks, boatsides & junk.