How to do cooling mod

LaserSVT

Got FB banned again for saying nards
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Nov 29, 1999
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I keep reading about people wanting to do the cooling mod on their 4-V but cant find anything on what I need or have to do to do it. Can anyone please help me? Are their ports already on the back of the heads or do I drill them, cause I really dont want to drill and tap holes on the heads.

I have seen the LDC for $230 at Stage3 motorsports but I dont know if it fits the "b" heads or only c heads.
 
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i just checked out a set of b heads today......it looks as though the ldc will work it might need a little tweaking but it looks very do-able


also d'agostino racing has taken over production of the ldc cooling mod
 
Cooling mod went prety easy actually. Most of my time was trying to get that darnd EGR valve loose so I could move it out of the way!

Also make sure you hit the freeze plug off center so it rotates in its bore. I used a screw driver so I could focus my hit to the edge of the inisde of the plug, and suprisingly it went smooth as glass. It spun right around in its bore and I pulled it out with needle nose vice grips. Sanded down the inside of the bore a little and installed the fitting....test fit the locking plate well before putting loktite on the bolt that holds it in position. I had to hone out the bolt hole in the retaining plate alot, so I could get it to line up with the bolt hole in the cylinder head.

Definitely recommended! Car takes alot longer to heat up now, AND if you touch the rear of the head....its just warm LOL. Front of the head is hot as expected...fairly close to full temp when I touched it.
 
A little late hope this helps.

Ok, this is what I did first: you do not have to remove the hood or even tie it off.

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As you see in the picture I took off the driver side wiper and placed a towel over the connector so it did not scratch the hood. It stayed like that with no problem and never got in the way.

I then removed the bracket that holds the throttle cable and injector harness and moved it out of the way.

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I also removed the plastic cover behind the motor.

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I went under the car to remove the EGR tube that was a no go for me I did not have a wrench big enough. However I removed the top EGR connector from the S/C and pulled it out it's a tough one but it will come out. There was enough room to maneuver(barely) but it worked because I had no other choice.

I then moved the wiring harness that sits right behind the S/C but near the top - it has two rubber connectors that go into the back of the S/C. Now the tough part was moving the wiring harness for the injectors; it is behind the S/C, but down under the fuel rails and there is not much slack. I managed to get a clear enough path that I could get my hand near the freeze out plug.

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I disconnected the heater hose at the metal tube in the rear of the S/C.

I used a flat head screw driver and a hammer and tried to spin the freeze out plug. It was tough so I got a great idea; I have a can of that dust off for keyboards to blow out the dirt and dust. The gas it uses is like freon it is damn cold well it comes out when the can is upside down. So I took the can turned it upside down and sprayed the hell out of the freeze out plug, it had frost on it. I then tapped it with the screwdriver and it spun with ease. The freon or what ever it is shrunk the freeze out plug. I then pulled it out with no problem and I was lucky because the sealant came out in one big ring so there was nothing to clean off. That was good because I really couldn't get my finger in there too easy.

I then put the unit together and used electrical tape to hold the brace on so it didn't fall off.

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It didn't push all the way in and because of the small work area I used the rear of my screwdriver and a hammer to tap it the rest of the way in. It did however go in very easily. I then had the problem of getting the lock washer down there I just pushed it on the end of the flat head and when I taped it it fell off on to the bracket. I then needed to get the screw down there I used a piece of electrical tape to hold the screw in the socket and it went right in and I ground down the bracket corner. I then tightened everything up connected the hose and reversed the above instructions to put it all back together.

As far as the front T fitting I did nothing different from the instructions. You remove the hose clamp and hose then take a cut off wheel or hack saw and cut about 1.2 inch off the metal tube and about 2 inches off the rubber hose. What I did was put it together an measured how much I needed to remove to put the hose in the same position. When cutting stuff a paper towel or rag into the metal tube or all **** is going to get into it. When done tighten all clamps but leave the 1/2 in hose off just turn it up so no fluid leaks out and how ever you can plug the T-fitting hole. Now take off the overflow cap and fill it up till it is at the top. Remove the burp plug in the cross over tube next to the S/C. Fill until it is topped off put the plug in put the overflow cap on and now reattach the 1/2 in hose to the T-fitting your done let it heat cycle but I had no air in the system this way. I had no leaks I feel so much better now that this is done and my 7 and 8 pistons are getting proper cooling.

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Nice, I ordered the parts through RandyStinchcomb on here for mine.....although I've got a 2V, so I'm sure it would be of much help to any of you but they were originally designed for the "B" heads if that helps.
 
It's a modification performed to the rear of the cylinder head in order to circulate coolant through the head at the rear where it normally just sits stagnant and creates hot spots at the rear combustion chamber and cylinder. It allows for more consistent cooling and in some cases the ability to run additional timing increasing longevity, horsepower and fuel economy.