Author Topic: rear port Pontiac 670 head  (Read 120 times)

1981TA

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rear port Pontiac 670 head
« on: August 13, 2019, 08:01:44 PM »
What is supposed to connect to the passenger side head rear port? it has what looks like a hose should slide on but really confused.
Sorry not sure how to post a picture

TammyTA

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Re: rear port Pontiac 670 head
« Reply #1 on: August 13, 2019, 08:49:47 PM »
A nipple with hose going to heater.  At least  I think it does on those heads.

b_hill_86

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Re: rear port Pontiac 670 head
« Reply #2 on: August 13, 2019, 09:34:33 PM »
You are correct
-Brian-

1977 Trans Am 400 4 speed

1981TA

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Re: rear port Pontiac 670 head
« Reply #3 on: August 13, 2019, 10:05:44 PM »
That’s what I thought I did connect to heater hose. And have anti freeze seeping through the intake ports. Not where intake connects to head literally through the intake.
Any thoughts on this? Engine has been completely rebuilt extremely frustrating

b_hill_86

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Re: rear port Pontiac 670 head
« Reply #4 on: August 13, 2019, 10:12:25 PM »
Where at exactly?
-Brian-

1977 Trans Am 400 4 speed

Re: rear port Pontiac 670 head
« Reply #4 on: August 13, 2019, 10:12:25 PM »

1981TA

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Re: rear port Pontiac 670 head
« Reply #5 on: August 14, 2019, 05:18:00 AM »
Theres an extreme amount of air in the system but anti freeze is coming through the front right of the intake. Any help would be great
Thank you

cyber104

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Re: rear port Pontiac 670 head
« Reply #6 on: August 14, 2019, 05:40:27 AM »
When you say "right front" are you meaning passenger or driver side?
1978 TA 4-Speed W72

1981TA

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Re: rear port Pontiac 670 head
« Reply #7 on: August 14, 2019, 05:49:47 AM »
Sorry passenger side

Fbird

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Re: rear port Pontiac 670 head
« Reply #8 on: August 14, 2019, 05:53:30 AM »
Need some more splainin....
front right? INSIDE the intake? or around the intake....
without pics the vocabulary is going to need to be a lot more defining.

Yes the rear passenger side is where the heater hose goes.
there is a "common" place for water leaks at the front .middle area where the intake manifold meets the timing cover assembly. If the intake manifold is tightened to the heads FIRST....it is common for said area to leak...regardless of how much you think you are tightening it...
67 Firebird
1980 Turbo TA (injected 400 now :) )

1981TA

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Re: rear port Pontiac 670 head
« Reply #9 on: August 14, 2019, 06:08:30 AM »
Sorry cannot get the pictures to upload. The intake is a Torker 2. The coolant is coming through the intake where the port on passenger front meets the base of intake. Its not leaking where the intake connects to the head. its seeping through which seem like from the pressure being built up in cooling system. Theres an extreme amount of air in system also. The intake seems fine if I have the radiator cap off so there's no pressure building up in the system. Once the cap is on and car is running  its builds up pressure and pushes the coolant through. It seems like theres circulation through the cooling system.

b_hill_86

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Re: rear port Pontiac 670 head
« Reply #10 on: August 14, 2019, 07:06:48 AM »
As far as the air, if you haven’t, pop the heater hose off of that back port on the passenger head. Tuck some rags around there and fill your radiator till antifreeze comes out that port. When it does put that line back on. That should help push most of the air out of the engine.

As far as the leak part, you have to use a photohosting site like Flickr or imagr or photobucket and post the “img” code to post pictures. I feel like the area fbird mentioned  is the same place you’re trying to describe. Without looking at my car, and from memory, the only two places the intake makes contact is against each head and against the back side of the timing cover we’re coolant does flow but that’s more on the driver side than the passenger side of the engine.

IF that’s the area you’re talking about there should be a bolt nearby that is long and sticks out toward the front of the engine. Loosen all of the intake bolts then tighten the long one to draw the intake against the  back of the timing cover then re-torque all of the intake bolts
-Brian-

1977 Trans Am 400 4 speed

oldskool

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Re: rear port Pontiac 670 head
« Reply #11 on: August 14, 2019, 07:47:31 AM »
Did you install the thick rubber ring between the intake & timing cover ?

Some call it an O-ring. Some call it a donut.

You MUST have the rubber ring. Most also use some gasket sealer on both sides of the ring.

Then, as posted, you need to tighten the timing cover to intake "draw-bolt", while the intake-to-head bolts are installed, but NOT tightened. This pulls the intake toward the timing cover, squeezing the rubber ring, and sealing that connection. THEN tighten the intake-to-head bolts.

Some separate the water crossover from the rest of the intake. This allows the crossover to be installed without the rest of the intake in place. Also allows the rest of the intake to be removed, without removing the water crossover. Some do this, so that they can swap on different intakes easily, without removing the crossover. Some do it, so that they can align the intake & head ports better. Some intakes, such as the KRE Northwind, come without an attached crossover. They sell a crossover, separately.

http://www.krepower.com/Pontiac%20Intakes.htm

I, and lots of other guys, have separated the intake & crossover, on both iron & alum intakes. But, most street guys prefer to leave the crossover connected, as produced. 
« Last Edit: August 14, 2019, 08:04:14 AM by oldskool »

b_hill_86

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Re: rear port Pontiac 670 head
« Reply #12 on: August 14, 2019, 08:35:17 AM »
Never knew you could do that
-Brian-

1977 Trans Am 400 4 speed


1981TA

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Re: rear port Pontiac 670 head
« Reply #14 on: August 14, 2019, 07:30:25 PM »
Thank you everyone for the great information, I’ll start with resealing the o-ring
That bolt wasn’t in place from the engine shop. They did install intake and had that bolt separate which apparently is a problem

Re: rear port Pontiac 670 head
« Reply #14 on: August 14, 2019, 07:30:25 PM »