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Some will recommend it, but IMO it's not entirely necessary if all your o-rings are still good. Mine were fine at 40K when I did my LS6 manifold, so I didn't bother replacing them and no problems yet...
Being as the gaskets are probalby fairly cheap you can replace them but I honestly doubt they will need to be replaced. I've pulled my manafold several times and ever replaced them.
As long as the same intake is going back on the same motor, you should be fine. Inspect the gaskets to make sure the are not damaged, cut etc. Should be fine Good luck
GM Part #12533587 should be them. I believe they come in a package of 8. Verify with your dealer before ordering.
I just bought a set and they do come in a package of 8 and they are not really cheap, but not wallet wrenching. My price (I have a wholesale account) was $54 and some change.
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Originally Posted by 99MAGKOOP
Thanks, What type of seals are they?
Pre-molded silicone that fit into grooves on the manifold. Like the others have said, they hold up well and barring any cuts, etc you should be fine reusing.