[punkin]

Hello everyone,

I am replacing the motor in my 68 firebird which will have Edelbrock heads. The original heads have a press fit nipple for the heater core connection. In my research it seems this nipple may also provide some additional restriction to prevent early wear on the heater core but I'm not certain. The E heads have a threaded connection.

What are you doing? Is this a real concern?

I thank you for taking the time to read and respond.

[Goatracer1]

Have had Edelbrock heads on my car for over 20 years. Just have a pipe nipple screwed into the head. Same heater core as when I installed them. I don't think you will have a problem.

[Formulajones]

Same deal as Goatracer, Edelbrock heads for about 20 years now with a hose nipple screwed in, and still running the same heater core the car has had for more than 30 years. Lots of racing over the years, never a problem.

[JLMounce]

Have the same threaded nipple in my KRE headed engine. Over 10,000 miles that way with the 50 year old heater core still in place. No issues.

[leeklm]

I have had a couple set of KRE heads, which also use a threaded output for the heater core. I have read that racing applications could cause an issue with a weak heater core due to high rpms and potentially higher water pump pressure??

Just in case, I had installed a restrictor plug with like a 1/4" hole drilled to allow some flow in my previous car. My current setup uses an aftermarket "marine" type heater mounted under the dash, which is essentially using a trans cooler for the heater core. I then installed a shut off valve in the heater collant line and ran a choke cable to the dash so I could control the hot water flow, shutting it off completely during the warm months.

It sounds better than it actually works, as the valve moves a little too hard for the choke cable to effectively operate it. But I can manually move the valve for more coolant flow under the hood during spring & fall.

Here you can see the Choke cable on the right side of the gauge panel.

Sent from my SM-G965U using Tapatalk

[punkin]

I thank you all for the responses. One less thing to worry about thanks!