[russosborne]

And how do you route them?

asking this since I was just reading the for sale ads and saw someone was selling plugs to put in that you screw hose connectors into. Someone asked in that thread how and why and never got an answer, and I want to know too. :-)

Thanks,
Russ

[Pontirag]

If you hook one up to your heater............

I dont see why its a bad idea?

you can tap a factory head and use the threaded ones. From the factory they are installed like freeze plug.

some of the aftermarket heads are threaded to accept a threaded plug. Ipso facto threaded nipple on pass side for heater or one on each side connected together to .....whats it for? A tee fitting to your heater might help burp the system. But what do you hook them up together for?

[ho428]

The theory on the rear plugs and hoses is to equalize the temps in the head, mainly on high performance race engines.

All water normally has to travel to the front of the head to get out of the thermostat housing, by tapping and installing fittings into the backside of the cross over and plumbing lines from the back of the head under the intake to the cross over, in theory, this should equalize dwell time of the water over the chamber and equalize chamber temps.

For street it allows use of AN hoses to the heater core for a nice look, but not much cooling benefit IMO.

I don't know if anyone has used a pyrometer to check temps on the head before and after doing this but I'd be interested to see what changes are seen.

[MescaBug]

If you are referring to the coolant plugs 67cruiser is selling, they installed like freeze plugs. Then use threaded hoses to it.

The goal is to bypass the heater and still provide cooling to both heads. You just run a 'T' connector from both heads to the crossover.

Edit: ho428 is right. I was typing when he posted

[russosborne]

Well, I live in Ohio so a heater is mandatory. :-)
I was wondering if it would help all engines, but since I don't have a high power engine I am not going to worry about it for now. :-) I have a Summit HEI and don't have a lot of room back there as it is.
Thanks,
Russ

[Ollie]

Check my post with photos, here.
http://forums.maxperformanceinc.com/...d.php?t=664234

[ho428]

Here's another pic.

[russosborne]

Ollie, is yours setup to keep the heater inline? Great picture, I was imagining the lines attaching to the back side of the heads, not the intake side.
h0428 nice picture, obviously you aren't using a heater, if I am understanding.

Oh, one more thing. Can you use hardline instead of braided hose? Any drawbacks?

Once again my Ford background is killing me. Not used to being able to route stuff under the intake. :-)

Thanks,
Russ

[Ollie]

Yes ,it goes to the heater, got to have heat and defrost here in the Pacific Northwest. Yes the lines connect to the intake side as in the stock location. I have seen some photos of hard line installations. But I think hose is easier to work with.
Photo of the AN fitting on the timing cover.

[Ron Landis]

Chebby guys do this on the "siamezed" cylinder 400 blocks to help eliminate hot spots in the 350 styled heads which are usually not drilled like the 400 heads. Not sure what the advantage would be on a Poncho. Just an FYI.

[Ollie]

I don't know of any advantage to this modification. I wanted some thing to dress up the SD Performance KRE heads with EFI.