I'm looking forward to seeing this.

 

Make sure your back doors are SEALED. I had the exhaust out the back for a short time, the fumes getting into the van were terrible, not to mention dangerous.

 

sounds like a plan...in my state exhaust is not supposed to exit under any passenger compartment...not sure if its on the books but few inspectors have told me this...visible side dumps are usually ok or under the bed of a truck...floorboards rust thru fast up here so it makes sense..

 

I took your advice
and I am going to put them directly under the short area behind the wheel well. Thanks

 

That's where GM put them, I quickly moved mine there too.

 

Curious about this. My 4.3 uses oil and mysterious P0300 keeps coming back despite NO discernable change in performance so I have been reviewing/putting together list of requirements for 350 SBC upgrade and 1 thing I am adding to list is Headers. can't wait to see some pics...

 

That's what started me on the road to a 350 too.

 

Speaking of headers... here are the long-tube headers I wanted to run on my 350

Problem is they don't fit the PS with the relocation mounts.
Driver side test fit is fine...

Passenger side does not fit with the relocation mounts on stock towers

The solution as been posted to move the stock tower forward, and use stock mount on PS.
Not sure if these clear the rest of the van either.. and probably not worth the trouble.

The simple solution is Hedman shorty 68600 headers, which work great
No mods, no cutting.. just install and go

Here's how mine looks from underneath (going with stuff I had handy)

This was supposed to be a temporary set up... exiting out in front of rear tires.
10 years later it all still works great.

 

Ok well to do the V8 swap in the AWD you will have to either raise the engine or have a custom oil pan made for the V8 in the AWD frame. as for the exhuat the headers I have were for a 94 Silverado with 350 and I had to cut the first pipe and remake it with new pipe I bought off ebay. I then bought a 2.5 inch dual exhaust kit from ebay and 2 xcelerator turbo mufflers from rockauto. (cheapest price i found too) I will take pictures as soon as the sun comes back as its raining here day 2. This is one way to fix the oil pan problem however you have to have a steel oil pan from an S-10 or AWD astro from before they went to the aluminum pans which are hard to find new but you may find a used one. https:// jagsthatrun.com/collections/chevy-s10/products/s10-v8-truck-4x4-oil-pans-parts-for-v8-engine-swap

 

Ok well to do the V8 swap in the AWD you will have to either raise the engine or have a custom oil pan made for the V8 in the AWD frame.

Is this a matter of interference with the front axle?

 

Yes it is. I bought one of the last premade oil pans from the owner of JTR publishing. I still have his phone number if you want to check and see if he has any left. 100 bucks and its your .... lol kidding his name is Greg Knell and his number is 925-462-3619

 

Mine IS an AWD so I will have lots of fun with this alteration/altercation...haha tight down there. JTR also has the AWD motor mounts. I don't have any friends in the fabrication world so Headers are of big concern for me and the fitment. plus as far as mechanic abilities, I am still a Newb.