Inline 6 Intake / Exhaust Question

[Street Sweeper]

I posted this question on the engine page - thought I might get more input if I posted here as well . . .

I've got a '65 suburban with a 230 L6. I'm ignorant on these motors - I admit that up front.

On an inline 6 (194/230/292) the intake and exhaust manifolds are bolted together. If I wanted to make an exhaust change (headers, etc.) without the expense of replacing intake and carb at the same time - is it possible? Can you run stock intake / aftermarket exhaust or vice-versa?

If so, what would I need to do to make it work?

Thanks for your help. I apologize up front for my lack of knowledge on all things L6.

[Tx Firefighter]

Yes, all of the stock intakes are bolted together with three bolts. You can swap intakes and exhausts back and forth. Different brands of manifolds might require headers though.

[aggie91]

Originally Posted by Street Sweeper

If I wanted to make an exhaust change (headers, etc.) without the expense of replacing intake and carb at the same time - is it possible? Can you run stock intake / aftermarket exhaust
If so, what would I need to do to make it work?

Thanks for your help. I apologize up front for my lack of knowledge on all things L6.

Yes, I did this a LONG time ago. I put on a Headman header and kept the stock intake and 1 bbl carb. The headers came with everything that I needed except for the exhaust tubing from the reducer to the mufflers and tailpipes.

[11echo]

I was thinking of this this myself! I was looking at these headers:

http://www.summitracing.com/parts/BIG-11510FLT/

[Street Sweeper]

Thanks for the link - I had been looking at Hedman headers form LMC. I like the price of Summit's better.

Now I've just got to decide if this old 6 cylinder is worth the effort.

[Street Sweeper]

Thanks Aggie91 - that's just what i needed to know - whether or not it was possible.

[Prerunner1982]

Clifford Performance also offers 6 cylinder stuff.

http://www.cliffordperformance.net/M...gory_Code=C250

My Father used some of their stuff in his Jeep CJ7 many years ago.

[11echo]

Left Field ...Have you thought about putting in a HEI distrubitor in? I just did, BIG DIFFERENCES!!!

[Shaky]

Clifford stuff:

[aggie91]

Originally Posted by 11echo

I was thinking of this this myself! I was looking at these headers:

http://www.summitracing.com/parts/BIG-11510FLT/

That is just like the Headman headers I used.

Originally Posted by 11echo

Left Field ...Have you thought about putting in a HEI distrubitor in? I just did, BIG DIFFERENCES!!!

Definitely do this, major improvment.

Originally Posted by Prerunner1982

Clifford Performance also offers 6 cylinder stuff.

http://www.cliffordperformance.net/M...gory_Code=C250

My Father used some of their stuff in his Jeep CJ7 many years ago.

This shorty head was not offered back when I did mine. I would have rather had them...

[hb32]

I bolted a set of Langdons cast iron headers on my 65 with a 230 a month ago. Next is an Offy single quad as soon as I come up with a carb. I was planning on a Holley 390 cfm but have decided to look for an older Rochester 4 jet which should bolt on without an adaptor plus look a little more period correct.

[hb32]

Originally Posted by aggie91

That is just like the Headman headers I used.


Definitely do this, major improvment.



This shorty head was not offered back when I did mine. I would have rather had them...

I went with the Pertronix and not sure if it is a major improvement but seems to run better.

[78 Chevyrado]

Originally Posted by hb32

I bolted a set of Langdons cast iron headers on my 65 with a 230 a month ago. Next is an Offy single quad as soon as I come up with a carb. I was planning on a Holley 390 cfm but have decided to look for an older Rochester 4 jet which should bolt on without an adaptor plus look a little more period correct.

I like those iron headers! They look slick! and so different

[66coffin]

i'm gunna run those cast iron ones on my 292 from Langdon's, i've heard good things about his stuff. check out his site langdonsstovebolts.com and listen to the sound clip he has of his split manifold sixer, it sounds awesome!!

[Street Sweeper]

Thanks for all the info - I knew I was coming to the right place.

hb32 - FYI - '68OrangeSunshine posted his set-up over on my post in the engine section. Here's what he did for a classic looking carb;

"an Edelbrock 1404 500 CFM 4Bbl [clone of the Carter AFB] on an Offy intake and Clifford long tube headers."

11echo - I was considering HEI - good to hear from some folks who have already done it.

thanks again everybody - this helps a great deal. It's nice to get some answers without having to take everything apart first.

[hb32]

Here is how it sounds

YouTube- 65 chevy stepside exhaust 002.AVI

[Vernski]

Hey Shaky what carb are you using on your Clifford? I used a Edelbrock 1404 manual chock and have been happy with it. Just a note if your going to lower your truck or bag it the long headers are not the best idea, with short headers you can run the pipes through the frame just something to think about...Vernski

[Shaky]

Originally Posted by Vernski

Hey Shaky what carb are you using on your Clifford? I used a Edelbrock 1404 manual chock and have been happy with it. Just a note if your going to lower your truck or bag it the long headers are not the best idea, with short headers you can run the pipes through the frame just something to think about...Vernski

It's a Holley 390 with manual choke.

[Shaky]

Here's what a stock intake and exhaust manifold look like. You can see that they're two pieces and that you can change out one or the other:

[hb32]

Originally Posted by Shaky

It's a Holley 390 with manual choke.

Any issues with the carb north/south and how does it run with the 390?

[Shaky]

Originally Posted by hb32

Any issues with the carb north/south and how does it run with the 390?

No north/south issues. It took awhile messing with jets and power valves and springs to get it working right since it was probably set-up for a V8 out of the box. It pulled strong when the secondaries opened up and it was up on the cam.