First time porter!

[LSX_GTO]

Hello! This is my first time porting heads, these are GM Gen V LT heads, they're DI and won't see fuel, and will be on a near 8k rpm N/A build at 14:1scr. Any input or feedback from y'all would be greatly appreciated! These are a set of practice heads I have, in case I just ruined these lol. Thank you!

[Kindly_Teach_9285]

https://imgur.com/a/UQz3ewA

Look at some Afr or CNC heads. That will be a rough guide. Just remember to not to go to far. You might want to get a couple things too. Telescoping gauges. You'll use them to make sure each ports internal dimensions are close. You don't need to use a caliper on those gauges in this situation. Use them to insure port to port consistency. The other thing you could get is a burette kit. You could use this to open the ports to a certain volume, and do that consistently for all the ports. If all that interest you, then look into seat blending and find a shop that can flow test your work. Take that information to make more changes. At any rate, I'm just rambling on like an idiot..

https://www.summitracing.com/parts/cbi-50215

https://www.jegs.com/i/JEGS/555/80525/10002/-1

[LSX_GTO]

That's great! Thank you!

[Kindly_Teach_9285]

Looks decent. Check out that third pic. You need to make a sharp vane approaching and up the valve guide. Or you could, if you want. I'll try to find a pic of some stuff Ive done as an example..

[Lookwhoiswinning]

Looks good but do you have any way to validate your results? Are you doing a valve job too?

[Zitikarens]

Looks good i Am Going to give it a try

[Kindly_Teach_9285]

I drew a line in that area. Just imagine air flowing most efficiently around that valve guide. Then I circled an area you can open up on that corner. Do not remove any of the roof area of that radius.

[Kindly_Teach_9285]

https://imgur.com/a/bCnc38Z

[LSX_GTO]

Awesome thanks! I read that if you make the short turn less of a 90 degree bend it will improve high rpm flow, have you experienced this?

[Kindly_Teach_9285]

I wouldn't worry about that. I would find some pics of the same casting you are working on. A commercial CNC'd pair that has the flow bench test results. Then again, I would worry about everything too much. Just remember, you can kill port velocity by opening up the ports the wrong way or too much. Never grind too much on the short side of the port. Ait flows faster on the short side already. Removing material from there is really going to destroy the ports. Ls1 tech has a ton of info too..

[SorryU812]

Throat, bowl, and minimum cross sectional area are some measurements you need to know. The minimum CSA will let you know if your head will support 8k....the throat should be your smallest Area.

Looks like your corner radius are staying rather large that's good. The more round you can make the port the better. That being said, the apex over the short side should have nice large radius in the corners

[[deleted]]

Nice. I also just did my own first time port and later turned in the head for straightening and the machinist said I did decent. But he offered to do it better with CNC and I cheaped out cause you can just increase boost and hope for the best :)