5.3 swap

[1972CST]

I am sure this has been covered many places but my last search didn't prove to be fruitful.

I am in the process of planning a 5.3 swap (from a 2001 Silverado) and need to know if the stock 5.3 exhaust manifolds fit in a 72 Blazer 4x4?

Thanks in advance!

[C.I.Blazer]

Very much new to this, but I am in the process of a similar swap. My understanding is that the stock manifolds will not fit without trimming the frame rails. I went with the Speed Engineering mid-length headers which fit great and were a good deal in my opinion. May want to look at the LS Swap section. There are a lot of threads there dealing with exhaust.

Hope that helps.

[1rippen6]

The research I have done shows the trailblazer SS and the newer camaro manifolds will work in the blazers without trimming.

[awelle01]

I also used speed engineering headers with a gen iv LS, along with a dirty dingo engine crossmember as the stock 4x4 crossmember does not work

[JMac11]

Pacific Fab Crossmember and TrailBlazer Manifolds work. I think they are offered by Dorman

[hemi43]

The stock truck manifolds will not work because they dump right on top of the frame rails. I used late model Camaro (2015) manifolds and they fit perfectly.

[1972CST]

Thanks everyone, I appreciate all the feedback!