wssix99

iTrader: (5)

If you are going to just try anything, IMO - kerosene would be safer than gasoline.

Have you looked for the Plastic ID stamp on the part? (It might be under one of the foam pads on the bottom of the intake. Once you know the material, choosing a chemical becomes really easy.

Anubis403

This is good info but GM uses mineral filled nylon (PA 66) for most of its intake manifolds. I'm in the engineering trade. Like most crystalline plastics, nylon offers exellent chemical resistance. You should be able to use kerosene with no issues. This chart may help you

http://www.newmantools.com/pipestopp...istance_nt.pdf

http://www.matweb.com/search/DataShe...6e21eed&ckck=1

wssix99

iTrader: (5)

So, if we wanted to confirm if our LS1 manifold is like most GM manifolds, we should be able to find a PA66 stamp, right? (I recall this material, like some other plastics, does not have the triangle/arrow symbol as it is not recyclable.)

Anubis403

IIRC, GM part drawings typically do not require that the material type be stamped into the mold cavity. Nylon (or PA 66 in this case) would likely have the number 7 recycle code (other---see link). This is usually up to the molding supplier. In the automotive undustry, using recycle codes shown in the link is less common than stamping the plastics acronym into the tool steel. If it is on the intake somewhere, it would have a prefix of PA (66 optional) and a suffix of GF or MF with a filler content number....10% as an example. Meaning it might look like this..... PA 66 GF10

https://www.google.com.mx/search?q=p...w=1280&bih=533

http://www.professionalplastics.com/ACRONYMS

ahhwataday

iTrader: (7)

Thanks! I havent had time to mess with it yet. I should have some time this week.
I did do the wire mod, remove egr and smog, cleaned my inner fenders. Intake and paint the radiator support are next.