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Old 06-12-2022, 09:49 AM   #1
Swedbrick
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Default Sliced 530 head - pictures & scans

Hi all, given I got access to these by I thought I'd open source them. STL files from skanect and original pictures are in the zip files

530-exhaust:


530-intake:
Attached Files
File Type: zip 530-exhaust.zip (292.7 KB, 18 views)
File Type: zip 530-intake.zip (314.1 KB, 14 views)
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Last edited by Swedbrick; 06-13-2022 at 11:06 AM.. Reason: fixes
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Old 06-12-2022, 10:39 AM   #2
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Awesome, thanks!
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Old 06-12-2022, 11:12 AM   #3
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That exh port hurts my eyes.
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Old 06-12-2022, 12:38 PM   #4
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These are great, now if only someone would ms paint a head porting for dummies.
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Old 06-12-2022, 10:41 PM   #5
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These are labeled in reverse. The tipoff is how much the exhaust is shrouded.
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Old 06-13-2022, 11:07 AM   #6
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Quote:
Originally Posted by shoestring View Post
These are labeled in reverse. The tipoff is how much the exhaust is shrouded.
Whoops, fixed
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Old 06-13-2022, 12:53 PM   #7
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Originally Posted by Truebeliever View Post
These are great, now if only someone would ms paint a head porting for dummies.
Google image search for the pic, and look here (use google translate for the page)

http://www.topplocksverkstan.se/omforetaget.html

There are "standard" porting practices that you can use, and see large improvements in performance. A lot of people port at the gasket areas, don't do that as a beginner.

~70% of porting gains will be ~1.5" into the port from the valve seat, and then chamber profile.

Porting at the gasket areas is pretty much pointless on the exhaust unless you're doing big changes near the valve. And I mean BIG changes.

Porting at the gasket area at the intake is OK, but you need to calculate the cross section areas (CSA) throughout the port to know what you need and where. Otherwise you'll end up with a port that slows down, and speeds up, and slows down, and speeds up as the air goes through the port.


In all honesty, for the majority (and I mean like 90%) of redblock builds, a simple bowl blend and a good valve job + increased CR will be all they'll ever need/want.
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Old 06-13-2022, 05:39 PM   #8
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Quote:
Originally Posted by 122power View Post
That exh port hurts my eyes.
It hurts my fingers and my soul every time i port one. It’s why i wish i hadn’t “traded” (give away) my two 16 valve heads.

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Originally Posted by Truebeliever View Post
These are great, now if only someone would ms paint a head porting for dummies.
I was just thinking about doing that.
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Old 06-13-2022, 05:41 PM   #9
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Quote:
Originally Posted by culberro View Post
Google image search for the pic, and look here (use google translate for the page)

http://www.topplocksverkstan.se/omforetaget.html

There are "standard" porting practices that you can use, and see large improvements in performance. A lot of people port at the gasket areas, don't do that as a beginner.

~70% of porting gains will be ~1.5" into the port from the valve seat, and then chamber profile.

Porting at the gasket areas is pretty much pointless on the exhaust unless you're doing big changes near the valve. And I mean BIG changes.

Porting at the gasket area at the intake is OK, but you need to calculate the cross section areas (CSA) throughout the port to know what you need and where. Otherwise you'll end up with a port that slows down, and speeds up, and slows down, and speeds up as the air goes through the port.


In all honesty, for the majority (and I mean like 90%) of redblock builds, a simple bowl blend and a good valve job + increased CR will be all they'll ever need/want.
All of that.

I worry more about the top of exhaust, and both of the inside radii. And all heinous sharp spots and boogers.

The chamber work all depends on the application.
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Old 06-16-2022, 08:09 PM   #10
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So these were already ported correct?

Anyone happen to have the head that was like two heads combined for better flow. Can't seem to find it anywhere but swore it was a Volvo guy and it was a significant mod.
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Old 06-16-2022, 08:14 PM   #11
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If there's port work I don't see it. And I don't know what you're talking about but it does sound fun.
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Old 06-17-2022, 08:49 AM   #12
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Quote:
Originally Posted by project volvo View Post
So these were already ported correct?
No these are completely untouched;)
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Old 06-17-2022, 09:29 AM   #13
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From what i remember, all the 8v aluminum volvo heads share the same exhaust ports.
The early and late style improved intake ports are close the identical from pics i have seen, but i only remember working on a few 531 heads, so i can’t be sure.
I can’t remember any chamber variations, but the B21s had a chamber that was wider than the cylinder by a small amount.

I don’t have a pic of a 398 on a B21, but here is a 530 on a B21.
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Old 06-18-2022, 10:34 PM   #14
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The differences are small coolant passage and large coolant passage also
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