Manifold/Cat flange

[Chris]

Are these bolts going to be a pain to get off? I have to change my cats in my driveway because they are used cats. Every exhaust shop I called will not do it. I plan on using a ton of PB on them and getting new gaskets. anything else I should know or need to prepare? Also what size are the bolts/nuts?

[DaveH71]

Yeah, they are probably not going to be easy. Just soak them for a couple days. Make sure you use a socket and don't round them. A little trick to use is if the PB blaster doesn't work, heat the bolts up a good bit and stick a candle on the end of the threads and let the melted wax wick into the bolt threads.

[Chris]

I have an impact. Would that help?

 

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[DaveH71]

I'd stay away from the impact, try a breaker bar. Use the impact as a last resort.

[SILVERADOSC540]

Hopefully the driver's side rear isn't broken off...

[Chris]

On the manifold itself? I'm more worried about the flange for the cats

 

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[NitroCherokee]

Didn't that engine just get installed a short time ago? I'd think the nuts will come off the studs pretty easy

[KMGZ400]

Didn't that engine just get installed a short time ago? I'd think the nuts will come off the studs pretty easy

 

thats a good point, you shouldnt have anything to worry about, it it was you 4.8 with over 100k, they would be a paint in the ass. like dave said, stay away from the impact.

[MikeNH]

If that truck has been in CA it's whole life they'll probably be fine. Not to mention they were definitely removed for the motor swap.

[Chris]

I lived in florida for a while with the truck

 

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[Wolfmanjohn]

If those flange studs/nuts are anything like my '04 'Vette, the nuts are prevailing torque, and will distort the stud threads when removed. Be proactive and buy new studs/nuts before you do this; I think you'll be glad you did. BTW, my 'Vette was only 3 months out of the factory when I learned this.