1996-2000 truck stock Cast iron exhaust manifold on 1985 C10

[Geoduck]

I've installed vortec heads on my 1985 305. I'm aware the 85 stock exhaust manifolds don't fit correctly.
My question is; will 1996-2000 Chevy GMC Truck Exhaust Manifolds fit my 1985 C10? Has anyone done this?
I'd like to retain cast iron manifolds. As I understand it headers would add very little to my 305 with a mild "RV" cam.

 

[jh86]

Headers or manifolds for 86k10 350 w/ Vortec heads?

Hello, Anyone have experience with headers or manifolds for 86 K10 350 with Vortec heads? I’d prefer manifolds over headers. Not looking for high performance. Have scoured internet but can’t find a straight answer.

www.gmsquarebody.com

 

[jh86]

What is your emission setup?

 

[bucket]

I've installed vortec heads on my 1985 305. I'm aware the 85 stock exhaust manifolds don't fit correctly.
My question is; will 1996-2000 Chevy GMC Truck Exhaust Manifolds fit my 1985 C10? Has anyone done this?
I'd like to retain cast iron manifolds. As I understand it headers would add very little to my 305 with a mild "RV" cam.

You will probably find that they are too wide and interfere with the frame rails.

With a little bit of cam and the better heads as well, long tube headers would likely provide a large enough bump in mid range torque to probably be noticed by the 'ol butt dyno. Quality headers and gaskets will greatly lessen the chances of experiencing the types of header issues that people tend to b!tch about.

But if you want manifolds, that's fine too. I believe mid 80's L69 or LB9 manifolds would be nearly a direct replacement. I don't remember them having the oddball bolt spacing.

 

[Geoduck]

What is your emission setup?

I removed all emission equipment. Do have PCV connected.