k10 exhaust manifolds

[chisler]

Time to replace the exhaust manifolds on my 1972 k10 with a 350...looking for the correct part number...Dorman....seems to have come up before....looking for the ramhorn straight dump....if any one can help.....the guys down at the local Napa store told me these only came on corvettes...But I think they are wrong........mine are cracked.....not bad for 39 years ......Thanks

[Axle]

Corvette is the most common app when people talk about rams horns. The Napa database may also have a few database errors in it and why it won't show for your specific application. I've run into it a few times in the past where year range is incorrect, but if you know a part number they can call it up.

There are a few varieties of rams horns available from Dorman;
General Corvette Exhaust search;
http://www.dormanproducts.com/search...rvette+exhaust

If your bored you can look through the truck specific manifold search and see what varieties they have;
http://www.dormanproducts.com/search...fold&pagenum=3

And heres a related thread with the truck specific numbers;
http://67-72chevytrucks.com/vboard/s...d.php?t=361938

Alex.

[chisler]

Thanks Axle.....this helps alot as on my k10 the exhaust manifolds do not angle backwards.... I am sure all the 4 wheel drives dump straight down....Thanks Frank

[TheWhiteElephant]

Been there with my '73 K20 350. Not sure on the differences between the 72-73, but I searched far and wide. I found a set of "Corvette" rams horns, the ones with the 2.5 outlets, straight dumps on ebay for $150 shipped. Pretty good product, HOWEVER:

The left side manifold comes really close to the left motor mount. In fact, I just had the exhaust installed in mine and the flange hits the motor mount slightly. I will have to go in there and grind a tad off the flange. So far no problems, though.

My truck had the ram horns when I got it, but the driver side one angled back for clearance. So just from my research, I would have to disagree that "all" the 4X4 ones dumped straight down as I could see this causing problems. I checked the codes on each of the manifolds on mine and they are apparently Corvette ones. You can still find these used on ebay or elsewhere, but I didn't want to buy used ones. Check the first page of my build thread for comparisons and pics:

http://67-72chevytrucks.com/vboard/s...d.php?t=430367

[chisler]

Thanks for the link to your build WhiteElephant....looks good...came up with a Dorman part number RB674501 I will give this to the Napa guy and see what he comes up with.Pretty sure my truck came with the straight dumps...only problem I have had is that the pipe after the manifold comes close to the starter...hunting season is about to start ....time to get things in order....Thanks