Great write up and all stuff that I want to do in the early spring since Ohio is currently white with snow and ice.
Several folks go with the 6.0 manifolds for this modification over the 6.4 manifolds. What was your deciding factor to stick with the 6.4 manifolds over the 6.0 manifolds either from RCD with the accompanying up pipes?
The 90 bend for OEM is in the manifold for the 6.0 and that keeps the blow out problem away BUT all RCD manifolds and up-pipes are welded not casted and they are twice as thick as OEM trash. So either one solves the problem. PERIOD!!!!
Most pick 6.0 as it has been proven and people don't like change or challenge things.
I still say the whole K&N and BD Brake vane that people say are bad are full of crap. I have both with no problems.
So it doesn't matter which one you pick from RCD for the blow out problem but here is where they are different.
1. RCD 6.0 manifold takes up a lot more room in an already tight place as they get really close to the A/C lines. You could probably move the lines over but I didn't want to take the chance.
I tell people their choice, but one day it might happen or not but if they don't mind their A/C lines burning up more power to them.
I prefer to keep my A/C in Texas as it gets hot and I don't want to take the chance.
2. RCD 6.4 manifold are tight up against the head and no problem rubbing or hitting anything. I know I put 1/2" Heatshield product around the manifolds and up-pipes and still nothing touches.
FLOW, I say as in headers design you pick the RPM range you want to make power and in a way you have two choices here:
3. RCD 6.0 do flow better IN THE (HIGH/MID) range
4. RCD 6.4 flow better IN THE (LOWER/MID), I'm not a racer so 6.4 are for me.
Also listen to a buddy's truck who has RCD 6.0 they seem a little bit louder.
Review my order of ranges as the first one is where the HP gain is more noticeable.
5. Up-pipes besides where the 90 is at there are no other different. I might be wrong but I'm not Mr. MicroScope.
Looking between the two I say the 6.4 RCD manifold will last longer as they have less small welds (look between exit pipe to exhaust port) each port has its own weld aka more welds and the 6.4 is one solid piece of SS welded.
To me 6.4 manifold have less chance of warping as they are one solid piece. I'm probably wrong but hey this are just my thoughts.
Don't get me wrong they are both great products and if I had to do it again I would have a hard time but I was in a rush as the dealer had my cab off and was replacing the bed pan under warranty and said they would have no problem adding a few after market part. ** PS Warranty Nazi my warranty is still good for bumper to bumper 100K/7 year if your dealer doesn't do that maybe you should work on your people skills
Also look at the price, there's a reason 6.4 are higher and other non-RCD are SO CHEAP!.
RCD has the best manifold/up-pipe combo I've seen so far.
If there's better I hope someone chimes in I would like to look at them and maybe one day switch out. I'm open.
No I'm not a racer but I'm building my truck to last not be +800HP demon beast and then I get all pissed off that my head or pistons crack. My goal is million miles but it might take 35 years. LOL..
I looking for a few HP with a tune and let the engine breath better. I see it as (what I did to my truck) why put an aFe downpipe, aFe 5" exhaust and remove DPF but have OEM manifold and up-pipe restriction? Either do it right or go home. Intake manifold / Turbos and APR studs with new pistons all from RCD are next.
I do not like PPE or whatever as they only seem a little bit better than OEM , casted with SS inserts or whatever. I stopped reading about them as I got sick to the stomach. A pig with lip stick is still a pig. PPE might be good for someone on a budget, no problem there but I want the best and face it SS is pretty. LOL..
Hope that answered your question. Thanks for asking!!!!..
I tell ya when I romp on it, it sounds like the gates of hell are screaming out of the engine. Everybody at the dealership wants to drive it but only the Mech who worked on it gets to do that.
Dude is amazing as his family are all Ford diesel truck guys from 7.3 to 6.7. Says a lot.
My hat off to you Buck!