Re: 1972 k20 4x4 exhaust system
 

It routes over the t-case. Not much room with 2.5"

Re: 1972 k20 4x4 exhaust system
 

Stw-CT6773TS is the part # I looked back and I ordered it from summit after talking with stainless works on which kit would work. Look on my build thread on how I routed it. Good luck:metal:

Re: 1972 k20 4x4 exhaust system
 

All K/20s are long beds. Only 1/2 tons were offered in SWB
I always have it run over the the crossmember between the transfer case and frame. One thing I always make clear when getting my exhaust done is nothing is to hang below the frame... nothing. I run full length headers and they are up above the frame bottom, so no reason the rest of the system can't do the same.

Re: 1972 k20 4x4 exhaust system
 

I called Stainless Works yesterday. The 3" kit they have for our trucks is set up for headers (like yours) OR a 2 1/2" kit is set up to attach to stock 2" outlet rams horn manifolds. There is no option to attach to the 2 1/2" high perf manifolds. Pretty disappointing. I also looked at the Heartthrob system and they only offer aluminized steel in 2 1/4". So a dead end there also (for 2 1/2"). It looks like a custom system is in my future if I want 2 1/2" mandrel bent stainless. I found this shop in MD http://mandrelbendingsolutions.com/.

Re: 1972 k20 4x4 exhaust system
 

Which manifolds do you run ?

Re: 1972 k20 4x4 exhaust system
 

2 1/2" outlet rams horn ( I believe they were off of a 67 vette).

Re: 1972 k20 4x4 exhaust system
 

I'm getting ready to put a new exhaust system in my '71 K20. Currently it has ramhorns on it, which I am okay with. However, to the best of my knowledge they are from a square body era truck (pic shown below). Would you guys replace the manifolds prior to having new exhaust ran or run them as is? Not really wanting to spend the extra money on new manifolds but also don't wan't to have my new exhaust routed to manifolds I will be wanting to change in the future...

Re: 1972 k20 4x4 exhaust system
 

Those aren't ramhorns. I would change to the ramhorns.

Re: 1972 k20 4x4 exhaust system
 

Would you mind providing a link with which ones you would go with and where you would get them from? Maybe some others will chime in as well.

Just want to get the proper fitment (rear dump, center dump, etc) for a 4x4.

Re: 1972 k20 4x4 exhaust system
 

Use the search function at the top of this page next to your user name (just to the left). Select the 67-72 chevytrucks.com button. Enter in "rams horn". I did this yesterday and there are piles of threads you can read through.

Re: 1972 k20 4x4 exhaust system
 

1971 K20 will be same as a 1972 K20 and use center dump ramhorns.

Re: 1972 k20 4x4 exhaust system
 

They are straight center dumps too

Re: 1972 k20 4x4 exhaust system
 

Indeed they are.... I was only thinking of center vs rear dump, didn't even think about straight vs angled. Thanks for the clarification! :chevy:

Re: 1972 k20 4x4 exhaust system
 

Sorry it took so long to respond, I got my 2.5 inch mandrel bent kit from MA Performance, for some reason it took them a long time to get the order sent out, but once I got it I can say I am pleased with the product. I choose the kit because it was 16 Gauge wall instead of the 18 gauge stainless and it was 304 Stainless instead of the more popular 409 stainless. I recently learned about the classes of stainless and the 400 class stainless (which most exhaust is made from) is more corrosion resistant than steel but it surface rusts over time given the conditions. 300 class stainless is the most corrosion resistant and is a higher quality stainless. MA performance claimed the kit was made by squirrelly performance. They offered a couple different sizes of kit and individual bends as well which i thought was neat. I used Magnaflows for my mufflers. and I can say it has turned out really nice so far. I will try and get some pictures taken and posted.

Re: 1972 k20 4x4 exhaust system
 

Are the straight center dumps you see on eBay or amazon that go for around $60 per side decent enough quality for a driver?

Re: 1972 k20 4x4 exhaust system
 

Subbed

Re: 1972 k20 4x4 exhaust system
 

https://www.speedwaymotors.com/Corve...fold,9133.html

These are the 2.5 inch corvette center dumps with alternator mounts.

Anyone try this route with their K-series? Either on a K10 or K20? The PO had the exhaust run under the transfer case on mine. I got this picture off the web.

Re: 1972 k20 4x4 exhaust system
 

Kit part number? AND :wop:

Re: 1972 k20 4x4 exhaust system
 

IIRC, the pic is how the OE stock exhaust is routed.

Re: 1972 k20 4x4 exhaust system
 

Thanks for the clarification, the PO put long tube headers and a 2.5 dual exhaust on mine. The only problem I have with it is it was the passenger side was ran under the transfer case, it is a custom exhaust system from a local shop.

Re: 1972 k20 4x4 exhaust system
 

I gottcha, I wouldn't like it under the t-case either. It might be possible to have a shop re-work just that section & run it above the cross member. I guess it depends on where the passenger side header collector is.

Re: 1972 k20 4x4 exhaust system
 

After looking at yours, I see why they put it under the transfer case, save time and money, that looks very tight in there. I think my truck was put together in a sequence where the exhaust was one of the last parts installed. Now it makes sense, my seals and gaskets leak 90wt close to where the exhaust pipe is, I have to have to put old cardboard/truck diaper under it.

Re: 1972 k20 4x4 exhaust system
 

By the way, I really like your trans and t/case color combination, that looks bad a$$!

Re: 1972 k20 4x4 exhaust system
 

Approximate cost of your kit. Thanks
Ron

Re: 1972 k20 4x4 exhaust system
 

That is some nice work.