Originally Posted by cobalt327
Trying to stretch a 5/8" heater hose out to 3/4" will weaken it IMHO. You might get it to physically fit, but the strength would be compromised I believe.
No room for a reducer like this (they also come in brass that are shorter)?
I may be missing something here, but why would you not run a 3/4 inch hose from the heater core, say about 10 inches long, then put this reducer and run 5/8 from there on out?