Intake Manifold Water Lines

General Engine Discussion

Moderator: John_Heard

Post Reply
Message
Author
User avatar
71 Nova
Posts: 257
Joined: Thu Dec 14, 2006 10:07 pm
Location: Santa Maria, CA

Intake Manifold Water Lines

#1 Post by 71 Nova » Thu Feb 04, 2010 9:56 pm

What are the water lines running front to back on each side of the manifold on this SBC for? I assume they are for pressure equalization or ??? Are they worth adding to my small block? My intake has the bosses for them... :scratch:
Attachments
SBC Water Line.jpg
SBC Water Line.jpg (25.43 KiB) Viewed 7879 times
69 Nova 408 SBC
Best to date: 10.241 @ 128.36 mph 1.404 60ft.

User avatar
vegaracer
Posts: 676
Joined: Mon Aug 20, 2007 1:12 pm
Location: Wyoming, Ontario, CANADA

Re: Intake Manifold Water Lines

#2 Post by vegaracer » Fri Feb 05, 2010 8:14 am

I think there to help the rear cylinders cool better. I've also seen just the two rear bosses connected together.
Feenstra's Towing

1973 Vega
434 SBC, N.A.
Powerglide
9.01 @ 146

User avatar
71 Nova
Posts: 257
Joined: Thu Dec 14, 2006 10:07 pm
Location: Santa Maria, CA

Re: Intake Manifold Water Lines

#3 Post by 71 Nova » Fri Feb 05, 2010 11:00 am

Do you have them on your SBC?
69 Nova 408 SBC
Best to date: 10.241 @ 128.36 mph 1.404 60ft.

User avatar
1720
Posts: 5
Joined: Sun Dec 09, 2007 1:55 pm
Location: Southern ON Canada
Contact:

Re: Intake Manifold Water Lines

#4 Post by 1720 » Fri Feb 05, 2010 2:51 pm

We have them on our 357, carried over from a 400 block based 377 that expired a while back. They are supposed to reduce air pockets forming in the heads,according to "experts". :-P
Attachments
motor09 001.JPG
RT Sr.
Racing WAY too long.
Team History http://home.cogeco.ca/~trthistory1/

User avatar
vegaracer
Posts: 676
Joined: Mon Aug 20, 2007 1:12 pm
Location: Wyoming, Ontario, CANADA

Re: Intake Manifold Water Lines

#5 Post by vegaracer » Fri Feb 05, 2010 9:45 pm

71 Nova wrote:Do you have them on your SBC?
Nope. I've thought about it, but have never followed through with it.
Feenstra's Towing

1973 Vega
434 SBC, N.A.
Powerglide
9.01 @ 146

User avatar
invegarating
Posts: 22
Joined: Sat Oct 31, 2009 4:41 pm
Location: southern Ohio

Re: Intake Manifold Water Lines

#6 Post by invegarating » Mon Feb 08, 2010 9:14 am

I use them on my SBC but it is a street car and yes they work well,I was told that the tubes let the water that is "trapped" in the rear of the block escape to be cooled [iImagemg][/img]

User avatar
wikd69
Posts: 2077
Joined: Sat Feb 23, 2008 12:42 pm
Location: Rocklin, CA
Contact:

Re: Intake Manifold Water Lines

#7 Post by wikd69 » Mon Feb 08, 2010 2:18 pm

Almost everyone I talk to running a BBC making good HP has similar questions: How do you manage the heat ?

I ran a small AN-3 line from a waterjacket cross-connect in the back of the block forward to the outside of the thermostat housing. This pretty much 'fixed' the issue I had of boil-over with my blower build. I found that if I lifted the cap and puked water, I was in for even more problems thereafter. Adding this vent line allowed any air/steam/vapor trapped in the top/back of the block to be pushed into the top of the radiator keeping a solid slug of water in the block. I also use a Moroso high volume/fast acting thermostat up front which allows a fair amount of bleed even when closed.

The AN -3 lines and the 'leakage' through the thermostat is just enough to act as a permanent air bleed, but not enough to compromise cooling or prevent the engine from maintaining heat in the block. One mistake I made was going with a really heavy-duty Fluidyne 3-core radiator - it's so thick that it's a challenge getting air through it. I finally got the fan shrouded fairly well, and that made a big difference as well.

The pix below show how things are plumbed. I'm pretty happy with the end result.

Image

Image

Image
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

Post Reply

Who is online

Users browsing this forum: No registered users and 20 guests