Reshaping a 4G63 combustion chamber how-to! 

I've never had the guts to tackle a cylinder head, but I've always gotten so much enjoyment from porting manifolds, O2 housings, etc. I don't know why, but it's almost meditative. You just zone in. I appreciate all the insight and the education on the 4G head, Dave!

I would like to have seen how you make each combustion chamber exactly the same shape and size. It is always interesting to see how others figure out solutions to problems you don't know you have.

great vid - love the 4g63 - was surprised how bad the OE casting was with the sharp edges etc

Thanks for putting all this info out. I have always wondered about the factory machining in the combustion chamber. You answered a lot of questions here.

Hi that was exactly the same as the last port and polish I did, Except I just had to go round with fine scotchbrite with solvo autosol on it. Best Wishes Dee

Great sanding tool ideas that I’ve never seen. Just found your channel and have only seen a couple videos but man…I’ve learned a ton. I’m from the dirtbike world and haven’t seen anyone else use some of these techniques. Good stuff! 👍

Wow, excellent watch, thank you so much. It makes me miss when I was porting my 8v head for my redblock, such a fun process to learn. Can’t wait for the next project to build further on it 🙏

Liked and subscribed- you do awesome work amd show technique in great detail. 👍

Thank you this is awesome, I am going to port tge head on my son's mini bike and I will try to use all the techniques you are teaching. I only have a small dremal but I am going to buy some single and double cut burrs for it. Thank you I am looking forward to completing you series on porting

It's great to see there are people who actually know what to do. I port two valve heads, both factory iron/ally and aftermarket. The call is becoming greater for the multivalve and it looks like a completely different world. Same general idea, but working the throat to bowl percentage out is something i need to develop. I've subscribed and thumbs up for your excellent content. Now looking to purchase some helix burrs.

Another awesome helpfully video!! Thanks

Good stuff! Thanks 👍

Great tips and tricks, thank you!

Id love to see you guy work your magic on a 1999-2005 mazda miata head, they flow quite poorly from factory

Great video way different than other video I seen great content

Would have loved to see more of the finish work with the scotch brite. Great vid tho as always. 😎👍👍

Cómo haces después para recuperar la relación de compresión que de acuerdo al material quitado está en 8 a 1

CC 1JZ chamber plz and tnx? Your channel doesn’t get enough love!

So great that you shared this; im curious do you guys finish it off with some polishing compound? I find it keeps the combustion bowl clean carbon wise and in theorie reflects the heat better a bit

Super neat

🇦🇬 Flow a stock 3SGTE; pocket port with stock guides w/reflow; full port and bronze guides port w/reflow for comparison; valve seat job as you see fit. 🙇🏾‍♂️

Front exhaust on air die grinder is fantastic for keeping things 'clean' and being able to see what your doing. I never used a regulator like that one, just put finger under the throttle control to limit speed (never even saw a small regulator back then except for spray guns) Been using the 'split rod' in various diameters with reduced end since around 1978, it's handy for cleaning up any part with a small round bore and can be made whatever length you need (repairing rust seized motorcycle main stand pivots was very common back then) I only just subscribed after watching the Lambo head video, you do some interesting stuff. Have you done motorcycle heads? (Since retiring I miss this stuff more than I thought I would although porting was only a small part of 'playing with motorcycles' 😁 Everything being smaller makes things a little more challenging, cutting 6" shank burrs to 4" or 4.5" makes them a lot more controllable but with shorter ports a lot can often be done with regular 3". Have you heard of or worked on Suzuki TSCC? (twin swirl combustion chamber) It came out around 1979-80 and is still used today although it has evolved in the last 40+ years Treats the 'halves' of a 4 valve head as two separate narrow combustion chambers with central spark plug, kinda similar to how you modified that chamber.

Perfect

It's awesome how easy you make this look. I've messed with a few heads in the past and it takes days when you're a beginner. About how many hours would you say it takes a pro to do a set of ports and chambers on a typical 4 cylinder head?

Best head in town.

Great video!! 👍👌 How much does your 4g63 DSM head flow (CFM) with +1mm valves and your 1200whp specs?

Really enjoying the videos so far, I will be looking at doing some work to my toyota 4EFTE head soon. Alot of people talk about de-shrouding the exhaust valves. Could you explain this process and what to look out for when doing it? Regards Blake

Great content, I love my street port 4g63 head that was done by you guys a couple years back.

I'd love to see a complete RB head build 🤞

I love these tutorials. Also convinced me that I don't want to tackle it. Do you know what happened to Trevor Johnson? I haven't seen his stuff for a long time.

Hey thanks for some real good real world very helpful practical knowledge without BS and bad music. Re another comment about CC's, do you not bother at all ? Just not in this video ? Or is shape more important than size ? I'm wondering where you put equalling CC's on the importance scale ? I will be looking for more of your videos, keep them up.

with respect to a 4g63 head, what will you say is the most you would take off when re-facing the head as to not cause head gasket failure from warping from high boost applications

How would you sharpen the super spiral burrs? Or do they ever even need to be sharpened?

What is the benefit from porting/reshaping of combustion chamber?

That chamber job is part of your 4G-1 full porting service correct?

So you never checked to see if combustion chamber volume is the same after you finished ? If it was cnc i wouldn't ask but hand port it can be off enough to matter id think?

Are the combustion chambers CC'D after porting?

How much HP is only that chamber work worth ?

Ìf you take snips and cutsmall l v notches in that roloc it will naturall conform to the round

These how-to series of videos are great. I would love to see a video about how you would fix a head that has core shift causing a 1-1.5mm lip between the bottom of the valve seat and the runner like this: live.staticflickr.com/65535/52345824181_8b04183778_k.jpg Do you enlarge the seat throat? Do you hand port only the affected area? Would love to know. Thanks!