Coolant air bleed block off

Are you talking about a block off for the steam ports?

Yes sir

Bigwilly1267 said:

Yes sir

Click to expand...

Allowing the steam to leave the head I would say is preferred once you start mods. I know you can purchase a cheap crossover (OEM style) and plumb it to your overflow return on the DS fender. Keeping the heat from building up in those back cylinders is a big plus (since they have been noted to go lean), and your tuner will like you for it. I used this for mine.
Good Luck, Jeff

Florida-Vee said:

Allowing the steam to leave the head I would say is preferred once you start mods. I know you can purchase a cheap crossover (OEM style) and plumb it to your overflow return on the DS fender. Keeping the heat from building up in those back cylinders is a big plus (since they have been noted to go lean), and your tuner will like you for it. I used this for mine.

OEM GM 5.3 5.7 6.0 6.2 STEAM PORT TUBE COOLANT CROSSOVER LSX LS1 LS2 LS3 LS6 LS | eBay

Find many great new & used options and get the best deals for OEM GM 5.3 5.7 6.0 6.2 STEAM PORT TUBE COOLANT CROSSOVER LSX LS1 LS2 LS3 LS6 LS at the best online prices at eBay! Free shipping for many products!

www.ebay.com

Good Luck, Jeff

Click to expand...

The heads I bought have them on both ends. I want to block off the rear. Would you suggest using both the front and rear?

May also consider: Straub head gaskets with additional hole for coolant | Cadillac CTS-V Forum (ctsvowners.com)

Bigwilly1267 said:

The heads I bought have them on both ends. I want to block off the rear. Would you suggest using both the front and rear?

Click to expand...

So the front you would use the OEM set up or even purchase and aftermarket steam vent kit (for all 4), but yes, I would not put Any plugs in the heads, I would have all 4 ports open and vented to the overflow tank. There are a lot of articles on how steam trapped in the top of the heads (on LS) can cause premature detonation, and or hot pockets above the back cylinders which is no good.
Hope I'm helping.
Good Luck, Jeff

Thank you very much for the replies

imthatguy09 said:

May I recommend the following:

4 corner steam vent kit

Sent from my SM-N986U1 using Tapatalk

Click to expand...

That will never fit once the blower goes on.

Bigwilly1267 said:

Thank you very much for the replies

Click to expand...

i would look into the Motion Raceworks steam port kit for lsa. I have it its a very nice kit.

Jperdeye said:

That will never fit once the blower goes on.


i would look into the Motion Raceworks steam port kit for lsa. I have it its a very nice kit.

Click to expand...

This is my issue. Everything is back on the car and I don’t want to take it apart.

I bought the rear vent kit from Random over a year ago at least....still sitting in the garage cabinet. I think whatever residue was on it should be inactive by now.

Bigwilly1267 said:

This is my issue. Everything is back on the car and I don’t want to take it apart.

Click to expand...

I was merely illustrating the 4 corner kit as a possible resolution, not necessarily the specific kit I went with. Definitely look at Motion's LSA kit.

Sent from my SM-N986U1 using Tapatalk

imthatguy09 said:

I was merely illustrating the 4 corner kit as a possible resolution, not necessarily the specific kit I went with. Definitely look at Motion's LSA kit.

Sent from my SM-N986U1 using Tapatalk

Click to expand...

Sir the kit you showed is certainly the kit I would have gone with.

Bigwilly1267 said:

Sir the kit you showed is certainly the kit I would have gone with.

Click to expand...

In my case, I'm going twin turbo with Holley sniper intake... So it fits underneath without issue.

Sent from my SM-N986U1 using Tapatalk

I used the Nitrous outlet steam vent kit, fits well and looks nice.

LSX Water Vapor Bleed Crossover Kit For Retro Fit LSA Blower Applications

Forza said:

I used the Nitrous outlet steam vent kit, fits well and looks nice.

LSX Water Vapor Bleed Crossover Kit For Retro Fit LSA Blower Applications

Click to expand...

I use the same kit. It’s a prick to install with blower on.