Cylinder head air bleeds
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Teching In
Joined: Apr 2008
Posts: 44
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Cylinder head air bleeds I just bought a LS6(cts-v) to put in my 97 GMC.
With the a Cylinder head air bleeds....
I know you are supposed to block the rear ones and have the cross over on the front.
But I was thinking of having the cross over in the back so I could run the hose to the overflow.
Would it hurt anything to have the block offs in the front and the cross over in the back?
Thanks, Kris
With the a Cylinder head air bleeds....
I know you are supposed to block the rear ones and have the cross over on the front.
But I was thinking of having the cross over in the back so I could run the hose to the overflow.
Would it hurt anything to have the block offs in the front and the cross over in the back?
Thanks, Kris
I just bought a LS6(cts-v) to put in my 97 GMC.
With the a Cylinder head air bleeds....
I know you are supposed to block the rear ones and have the cross over on the front.
But I was thinking of having the cross over in the back so I could run the hose to the overflow.
Would it hurt anything to have the block offs in the front and the cross over in the back?
Thanks, Kris
With the a Cylinder head air bleeds....
I know you are supposed to block the rear ones and have the cross over on the front.
But I was thinking of having the cross over in the back so I could run the hose to the overflow.
Would it hurt anything to have the block offs in the front and the cross over in the back?
Thanks, Kris
Don't block the fronts. The fronts are the high point & you'll trap air. Alot of us connect the front & rear vents, tie them together & into the top of the radiator hose. This gives a bit more circulation @ the rear of the block & is also another place for air to escape should there be any. Also, you don't need any pre-made cross over tubes to do this. Just install some hose to NPT nipples to the vent ports & connect them w/ fuel line or heater hose.
Thread Starter
Teching In
Joined: Apr 2008
Posts: 44
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thanks for the info.
What type of T do you use to tie into the radiator hose?
"Just install some hose to NPT nipples to the vent ports & connect them w/ fuel line or heater hose."
My engine didnt come with the GM pipes, so are you saying make my own?
I'm not sure what NPT nipples are, would these bolt on the block where the GM tubes go?
Thanks, Kris
What type of T do you use to tie into the radiator hose?
"Just install some hose to NPT nipples to the vent ports & connect them w/ fuel line or heater hose."
My engine didnt come with the GM pipes, so are you saying make my own?
I'm not sure what NPT nipples are, would these bolt on the block where the GM tubes go?
Thanks, Kris
Yes, they can be made. The rear vents are threaded (I think they are 1/8" NPT; National Pipe Thread). Anyway, I used 1/8" male Pipe thread to 1/4" hose barb, brass fittings, in the back of the heads & then used 1/4" hose to connect them. On the front vents I used the stock tubing & am not sure if they were threaded or not. You can either use 1/4" brass T's or nylon (rated for coolant temperatures). I T'd the rear line to the line that runs from the front stock tubing to the top of the radiator hose.
Once you have a look @ the area, it will be more clear. If not, you can just run the front vents to the top of the radiator hose & be done. Good-luck
Once you have a look @ the area, it will be more clear. If not, you can just run the front vents to the top of the radiator hose & be done. Good-luck
