lgoodson@pacbell.net Posted June 21, 2009 Share Posted June 21, 2009 Does the coolant flow through the LT1 intake or not. Some people say it does not but the 2nd line in the shop manual for removing the intake says to drain the engine. I need to reseal the intake but don't want to dump water into the engine and draining the whole thing will be a pain. Quote Link to comment Share on other sites More sharing options...
deja Posted June 22, 2009 Share Posted June 22, 2009 From http://www.indipalass.com/ARCHIVE/TechCorner/ARTICLES/LT1ReverseFlowCoolingSystem.htm Dry Intake Manifold: The LT1 has absolutely NO water running through the intake manifold! Conventional cooling systems have passages in the intake manifold which allow coolant to crossover from one side of the engine to the other. In the LT1, coolant crossover occurs in the water pump, which is also where the thermostat is located. Since there are no coolant passages in the intake manifold, a major source of leaks has been eliminated. Overall engine reliability is improved since an intake manifold leak allows coolant to enter the top of the engine which can quickly wipe out the camshaft, lifters, and other major engine components. Does the coolant flow through the LT1 intake or not. Some people say it does not but the 2nd line in the shop manual for removing the intake says to drain the engine. I need to reseal the intake but don't want to dump water into the engine and draining the whole thing will be a pain. Quote Link to comment Share on other sites More sharing options...
lgoodson@pacbell.net Posted June 22, 2009 Author Share Posted June 22, 2009 Deja, Thanks for clearing that up. The shop manual would let you believe that there is coolant there because it says to drain the engine when pulling the intake. Glad to hear I won't have to so the job should be a breeze. Thanks again for the quick response. Larry Quote Link to comment Share on other sites More sharing options...
bodie Posted June 22, 2009 Share Posted June 22, 2009 they want to drain the coolant cause they also want you to remove the coolant line the connects both head at the rear. some people get to agresive when trying bend it out of the way when removing the intake. Quote Link to comment Share on other sites More sharing options...
deja Posted June 22, 2009 Share Posted June 22, 2009 That's a good point. they want to drain the coolant cause they also want you to remove the coolant line the connects both head at the rear. some people get to agresive when trying bend it out of the way when removing the intake. Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted June 22, 2009 Share Posted June 22, 2009 lt1 cylinder heads don,t flow coolant thru the intake to the radiator like the earlier heads do, the water pump is the exit point for coolant flow. NOTICE THE STANDARD DESIGN HEADS HAVE WATER to INTAKE TRANSFER PORTS Quote Link to comment Share on other sites More sharing options...
lgoodson@pacbell.net Posted June 22, 2009 Author Share Posted June 22, 2009 Well I just looked at the rear of the intake. Even with the JTR set back there is still plenty of room and what I saw was that there was no interfearance with the Vent pipes and the intake. Looks like the intake should lift straight up and out unless there is something under the intake that necessitates moving the intake to the rear to get it up. Quote Link to comment Share on other sites More sharing options...
deja Posted June 22, 2009 Share Posted June 22, 2009 The steam pipe runs along the intake. In fact it has a bracket that bolts to the 3rd intake stud and holds it against the valve cover. I just looked at mine, if you're careful it looks like you should be able to get the intake off. Quote Link to comment Share on other sites More sharing options...
lgoodson@pacbell.net Posted June 23, 2009 Author Share Posted June 23, 2009 Yea, that pipe is close but with the clamp removed hopefully I will have the needed clearances. Quote Link to comment Share on other sites More sharing options...
ekiernan Posted November 28, 2009 Share Posted November 28, 2009 (edited) If using an F-Body water pump ('95 Z-28), where do you run the "engine coolant bypass" port to. It is the exit from the water pump in the lower right portion. Also, what does this do? Thanks! Eric lt1 cylinder heads don,t flow coolant thru the intake to the radiator like the earlier heads do, the water pump is the exit point for coolant flow. NOTICE THE STANDARD DESIGN HEADS HAVE WATER to INTAKE TRANSFER PORTS Edited November 29, 2009 by grumpyvette Quote Link to comment Share on other sites More sharing options...
deja Posted November 28, 2009 Share Posted November 28, 2009 Most of us use a rubber plug you can get in most parts store to plug the hole after getting the hose fitting out. You can also tap the hole and use a threaded plug. This is how I hooked mine up: I think it is used on the SS Camaro for the oil cooler. There is a fitting on the Camaro radiator. Quote Link to comment Share on other sites More sharing options...
lgoodson@pacbell.net Posted November 29, 2009 Author Share Posted November 29, 2009 deja. what size plug since I have 2 that are leaking 1/2"?? Quote Link to comment Share on other sites More sharing options...
deja Posted November 29, 2009 Share Posted November 29, 2009 I think it was a 3/4" freeze plug. YOu can measure the hole once you get the fitting out. deja. what size plug since I have 2 that are leaking 1/2"?? Quote Link to comment Share on other sites More sharing options...
kenz240z Posted November 29, 2009 Share Posted November 29, 2009 I think the reason the shop manual recommends draining some of the coolant before removing the intake on the LT1 is because coolant does flow through the throttle body in the stock set up. Refer to items #4 and #5 in the diagram posted above, those are the hoses that connect to the t-body. If you bypassed the t-body coolant lines in your car then no need to drain the coolant before removing the intake. Quote Link to comment Share on other sites More sharing options...
deja Posted November 29, 2009 Share Posted November 29, 2009 You are correct. Most people upgrading these engines bypass the throtle body. Its really only a smog thing. I think the reason the shop manual recommends draining some of the coolant before removing the intake on the LT1 is because coolant does flow through the throttle body in the stock set up. Refer to items #4 and #5 in the diagram posted above, those are the hoses that connect to the t-body. If you bypassed the t-body coolant lines in your car then no need to drain the coolant before removing the intake. Quote Link to comment Share on other sites More sharing options...
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