Friday night I blew another heater core, (CAN'T SOMEONE DESIGN AND BUILD A HEATER CORE THAT LAST'S?) the damage these cores do when they leak antifreeze inside the car is horrible. I put a bypass tube in and the car made it thru Woodward Cruise. My question, does bypassing the heater core cause any difference in the way the car will run? Thaks

Only due to a lower cooling fluid capacity. If your car runs at a higher temp than normal that could be the cause, otherwise, no big deal.

there has to be a good quality core out there somewhere. I would call your local radiator shop & pick their brains on this. they'll likely locate a premium ($$$) one but that's what we need.

HAH! Local radiator shop? Dead as the dinosaurs. The radiator shops I know do one thing only...replace with new.
Maybe in the smaller rural towns you can find a guy who refuses to retire, but there's not many.

My last heater core leak turned to be a leaky valve which is only available NOS.

No problem with bypassing the heater core, I used to do it in the summer months because our old International pickup had a heater valve that leaked, providing heat all summer. It was easier to remove the heater hoses and use a short length of hose to bypass than it was to find and replace the leaky valve.

R.

Call Glen ray radiators, they can fix it.

Heater delete cars just used rubber cap plugs with clamps over the inlet & outlet nipples on the engine.

Fortunately, I'm born n raised in Motown and we all have the benefit of having Ferndale Radiator on Woodward not too far away. Last year when I overheated I asked a local restoration guru where he gets his radiator's rebuilt and he said Ferndale. I walked into the past, third generation, 1925 Cadillac, 69 Mach 1 and several old truck radiators ready for pickup. Three row using the original top and the car never gets half temp on the original gauge. I'll stop there tomorrow.