An Amateurs Guide to Porting a 12 Valve Cummins Cylinder Head: Tips, Tricks, Cutaway's, and Examples 

Swirl is not for streetability, it is for power. Take that swirl ramp out and you get more smoke and less power.

I subscribed to your channel for the sheer fact you present confidence in something that doesn’t offer much information on many youtube channels. That’s awesome and I can appreciate your efforts and patience. I’m porting a set of 7.3 Powerstroke heads, mostly on the exhaust side I’m gasket matching them and with the particular design, I’ve been able to pick up 3/16” from the stock 1.5” port. In a 7.3 Powerstroke cylinder hear the intake and exhaust valves are the same size which is 1.675”. I’m looking mostly to lower EGTs for durability and possibly improving efficiency by a slight amount. After opening the 1.5” exhaust port another 3/16” it is very close to 1.675-1.680, very relative to the valve size. I’m still in the painstakingly time consuming part of this process, but I do anticipate seeing a significant reduction in back pressure and a faster transfer of heat out of the combustion chamber. I’ll try to have some more information on the intake side once I get to that section of the head. Operating off Boost, I believe opening up some of the restrictions in the intake ports and upsizing the valves to the 1.80 - 1.90” area along with 45 degree cut valve and valve seats will allow more CFM. It will be a very tight fit but for this particular application on a 7.3 Powerstroke I see quite a bit of room for improvement. I’m Definitely going to have my clearances checked before taking major steps away from original engineering, but if my calculations are correct, I’ll increase airflow quite a bit. I’ll know more in the future. Keep up the good work man, there’s not much out here about diesel head and port work, So I know I sure appreciate videos like this one.

Good to know. I remember I bought a jetta off of you a few years back and it promptly blew up on me. Either way, nice to find a familiar face

👍👍...Ive got a couple extra head's lying around here, 6B and Isb...like most do, im sure... time permitting, might have to try something like this myself someday, just to see what happens 😂.... thanks for all your time and videos 👍👊🤘

Very Nice!!! Love the How To tech, not much info out on what material can be removed. Keep it up!!!!

Awesome job, waiting for om606 project

I got a bit carried away a couple times from this job taking me so long that i cut too much of the valve seat away in a couple spots 😅😅

I’d like to see the before and after flow difference of doing this. Just wondering if it’s worth it or not. Same question applies to my OM602 and 603 projects!

Unshrouding the chamber side helps flow at all lifts, think about it, air runs into a wall for the first couple hundred thousands of lift.

Hey sorry about the disappearing messages. I don't know what's going on with my Instagram, I've never messed with the settings and I didn't see any to change anything. I was just wondering how much timing in that rev video.

Shows how appallingly bad the standard head is ,small , shrouded and jagged cast and flash it works inspite of factory ,great care with a diesel head for substantial power gain.

Its your time or big bucks paying someone else to do the same ,they may be better then you but may not on more unusual porting with a squashed half port from factory any increase in flow very desirable.