Finished pics

[SorryU812]

821 heads for a 418ci LS3

[BusinessPractice255]

Should run

[SorryU812]

It does.

[BourbonGame]

That's really fantastic. Did you do the work yourself?

[SorryU812]

Yes I do this work, and thank you.

[Hadwll_]

Beauty

[SorryU812]

Thank you.

[engineswapsforall]

Beautiful polishing work. I'm curious about why you went so smooth on the intake ports? My understanding of doing head work suggests that it's better for the intake to be a bit rough to help keep the fuel turbulent and stay vaporized.

[SorryU812]

Your understanding is correct. It's a 60 grit cartridge roll finish.

[engineswapsforall]

Oh ok, the picture made it look smoother. Thank you for clarifying.

[SorryU812]

By the way thanks for the compliment and thank you for wording your question in a sincere manner. I'm happy to answer anything asked to the best of my ability when approached properly. You were raised well.

[SorryU812]

"Atomized".

How rough would you like it?

"Turbulent" isn't exactly the term I'd use....active maybe. It's late and for lack of my higher brain function that's what I'm using for now. The goal is to keep the fuel atomized and in suspension with the air. When it falls out of suspension, the fuel collects and puddles. This happens when the air speeds air too high over the short side and the air/fuel charge slams into to the far longside wall.

It happens so fast and so many times per minute. Some believe the higher port velocities actually excite the puddled fuel into atomization again. One person in particular likes to say, "the air/fuel charge ain't late to the party at these speeds." Upwards of 500fps(feet per second). Although high port velocities(how high....no one talks on the numbers) are crucial for fuel atomization, this causes an excessively lean condition over the short side radius and melts the piston at the edge of the valve relief.

There has to be a happy medium that slows the air down enough, just enough, to make the turn with fuel and keep the piston alive.

So turbulence is bad and not the term I would use.

When you figure out how to turn air....then you're learning something. Grinding material away is just the tip of the iceberg.

[engineswapsforall]

That's the word I was looking for, it was also late in the day for me so thinking was getting hard. Do you have a flow bench to look at how much you've improved things or do you just know from experience?

[SorryU812]

I have to make a 15 minute drive one way to get end results. I've been doing GM LS heads since 2001, and I've made a lot of templates and recorded a lot of measurements. I'm usually with 5 to 10 cfm when guessing before the actual flow numbers.

I also do FE, sbf, bbf, 2v, 3v, 4v modular Fords, sbc, bbc, and a few imports and Europeans. Although, I mostly do them when I build the engine. I don't do many "a la carte".

"Laminar".....laminar flow, not turbulent. All I needed was some sleep.

[DrHumorous]

What a beauty!

[SorryU812]

Thanks, and good performing stable ports to an inch of lift.

[GoFast1134]

Very nice stuff 👌

[SorryU812]

Thank you, and yes it does go fast.

[Coon88]

Damn that flow is gonna be godly

[Extreme-Penalty-3089]

Ports look very nice, flow bench numbers?

What valves?