Intake manifold question (GM) - Chevelle Tech
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post #1 of 5 (permalink) Old Oct 31st, 03, 12:32 AM Thread Starter
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Enrique
 
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i have a GM aluminium intake (SBC) cast #520. Its an EGR intake that has had the EGR deleted by a plate. I have to questions about it.

1. The ports (hole, whatever they are) furthest back are plugged up. I think these holes are for water circulation. I've seen some intakes with this plugged up and some without at the local swapmeets, most of the ones with these hole plugged are GM intakes both BBC and SBC. What i want to know is why they are plugged up, it looks like it is from the factory. Are these water ports not necessary? (want to use this intake on a daily street driven 350(stock bottom end), stock 76cc heads, comp cams 260H and hooker comps).

2. The manifold is painted [email protected] blue, i am going to paint my engine Chevy orange and do not want that ford color on my intake. I am thinking on painting the intake orange for the stealthy look. My question is, what is the safest way to remove the paint. I know bead and sandblasting can make the intake too porous so what can i use to remove the blue paint?

thanks in advance.
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post #2 of 5 (permalink) Old Oct 31st, 03, 8:47 AM
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Enrique,
Unless it is a Fuel Injection manifolds, the very back holes are not supposed to be "open" They really do not go anywhere if you look at ehm closely. They probably have some corrosion around them from being in contact with water, but thats it.
The only manifolds that have the holes open are the ones for fuel injection. The EFI engines circulate some water up to the Throttle Body to help in fuel atomization.

Bill Koustenis
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post #3 of 5 (permalink) Old Oct 31st, 03, 11:06 AM
 
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Bead blast the manifold,hose it out good with soap & water and paint it Chevy orange.
You might want to can a rattle-can of self etching primer & prime it first. [img]graemlins/beers.gif[/img]
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post #4 of 5 (permalink) Old Oct 31st, 03, 7:41 PM Thread Starter
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Enrique
 
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thanks for confirming what some guy at the swapmeet told me.

now, i ran a search on this site and i got conflicting advise. some say bead blasting will make the manifold too porous, others that it will embed bead in the manifold and then the beads will drop into the engine internals upon start up. and some say to go ahead and bead blast it.

can i use some type of paint stripper or is that a bad idea too?

thanks a lot guys.

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post #5 of 5 (permalink) Old Oct 31st, 03, 11:54 PM
pdq67
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Don't forget to remove the bottom heat deflector pan if it has one on it!!

Use a good set of vice-grips and carefully work the screw-pins until they come out and reuse them if you want to.

BUT be sure and soap and water her really good to remove any glass beads or steel shot or whatever you blast her with.

I personally would try some paint stripper that has the good old "HAP" Methylene Chloride in it, (if you can find some), and a brass toothbrush on it!! Maybe even some Dupont Oven Cleaner??

Spray her down and watch for any excess aluminum metal corrosion as the paint comes loose after sitting for a while as you use the brass toothbrush..

pdq67

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