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Alexander_Monday
Samba Member
Joined: November 09, 2007
Posts: 452
Location: Springfield Missouri
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 Posted: Thu Aug 21, 2025 5:39 am Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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Many thanks to Brian!
The intake CFM converted to 25" water are fairly close to what I could find on the wayback machine that CB published back in the day for these.
In case someone is interested:
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Danth’s or Parker’s Law:
“If you have to insist that you've won an internet argument, you've probably lost badly.”
Alexander_Monday->What were the rings gapped at?
bedlamite->Almost enough.
| andk5591 wrote: |
The original german engineers have attained sainthood and it is impossible to improve perfection.
Anything that anyone does to deviate from the original designs will be made to wrench on 20 year old Yugos with Harbor Freight tools in hell. |
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Alexander_Monday
Samba Member
Joined: November 09, 2007
Posts: 452
Location: Springfield Missouri
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| Posted: Fri Aug 01, 2025 10:26 am Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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Thank you, will be in touch DM
_________________
Danth’s or Parker’s Law:
“If you have to insist that you've won an internet argument, you've probably lost badly.”
Alexander_Monday->What were the rings gapped at?
bedlamite->Almost enough.
| andk5591 wrote: |
The original german engineers have attained sainthood and it is impossible to improve perfection.
Anything that anyone does to deviate from the original designs will be made to wrench on 20 year old Yugos with Harbor Freight tools in hell. |
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Brian_e 
Samba Member
Joined: July 28, 2009
Posts: 4218
Location: Rapid City, South Dakota
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| Posted: Fri Aug 01, 2025 8:13 am Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| Alexander_Monday wrote: |
| Mark Lawless doesn't have the exhaust flow numbers either. |
Send me one with a manifold. I will get you some numbers and send them back. You just pay the shipping both ways.
Brian
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Narrowed beams, Drop adjustable spring plates, Bus disk brake and IRS kits.
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Alexander_Monday
Samba Member
Joined: November 09, 2007
Posts: 452
Location: Springfield Missouri
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| Posted: Fri Aug 01, 2025 8:08 am Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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Mark Lawless doesn't have the exhaust flow numbers either.
_________________
Danth’s or Parker’s Law:
“If you have to insist that you've won an internet argument, you've probably lost badly.”
Alexander_Monday->What were the rings gapped at?
bedlamite->Almost enough.
| andk5591 wrote: |
The original german engineers have attained sainthood and it is impossible to improve perfection.
Anything that anyone does to deviate from the original designs will be made to wrench on 20 year old Yugos with Harbor Freight tools in hell. |
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Alexander_Monday
Samba Member
Joined: November 09, 2007
Posts: 452
Location: Springfield Missouri
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| Posted: Fri Aug 01, 2025 5:29 am Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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Anyone have the flow numbers for the exhaust for CNC CB Street Eliminators 44mm / 37.5mm circa 2008?
I can find the intake both in the first post and by using the wayback machine, but I cannot find the exhaust.
Pat and Marianne both said they do not have them, waiting on a reply from Mark Lawless to see if he knows if they are collecting dust somewhere at CB.
_________________
Danth’s or Parker’s Law:
“If you have to insist that you've won an internet argument, you've probably lost badly.”
Alexander_Monday->What were the rings gapped at?
bedlamite->Almost enough.
| andk5591 wrote: |
The original german engineers have attained sainthood and it is impossible to improve perfection.
Anything that anyone does to deviate from the original designs will be made to wrench on 20 year old Yugos with Harbor Freight tools in hell. |
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David Raistrick
Samba Member
Joined: January 26, 2004
Posts: 634
Location: Geneva, Florida
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| Posted: Sun Jan 19, 2025 12:18 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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some stock numbers for the chart:
043-101-375H - early 2000s castings (2001, 2003, 2003), small valve FI head 33mm/30mm valves
41-43cc chambers on the 3 I've measured (without the step). Step has been a consistent .054" on all 6 bores. (fairly low mile used - 2 have 8k, the 3rd isnt known)
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AlteWagen
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Joined: February 23, 2007
Posts: 8730
Location: PNW
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AlteWagen
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AlteWagen
Troll
Joined: February 23, 2007
Posts: 8730
Location: PNW
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| Posted: Tue Dec 21, 2021 9:05 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| QRP wrote: |
The chamber looks similar to the Berg semi hemi. |
Looks like a custom piston dome is going to be used because of the shape. I think a large dome piston for 1600 based builds sure would help the efficiency of all those semi hemi heads sitting on the shelves and even the stock type chamber design.
A domed, forged, thin ring pack piston in 88mm would be a best seller with a 92 coming in a close second. A 'B' pin height would also open up a lot more options for the 88 since they have not been available for decades
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Grapes of Wrath $200 Engine Rebuild
Official Dual Carb Thread
Cylinder Head Quick Reference Sheet |
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QRP
Samba Member
Joined: April 27, 2008
Posts: 1972
Location: NORTH HOLLYWOOD,CA
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| Posted: Tue Dec 21, 2021 8:33 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| AlteWagen wrote: |
Had to add this thread here for anyone working on WW Okrasa heads.
https://www.thesamba.com/vw/forum/viewtopic.php?t=757037
from the thread are the flow numbers for the WW Okrasa heads
| Alstrup wrote: |
All flow numbers are at 28"
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I might have to try machining some seats in the future! |
The chamber looks similar to the Berg semi hemi. |
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AlteWagen
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AlteWagen
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| Posted: Thu Dec 02, 2021 9:54 am Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| Johannes Persson wrote: |
Heads latest upgrade with modifications to intake throat, valve seat and chamber. Flow improved from 262.5cfm to 277.5cfm at 25"H2O or from 277.7cfm to 293.6 cfm at 28"H2O.
Very exciting!
I guess with this upgrade I have to change the name of the heads from MS250 to MS260 |
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Official Dual Carb Thread
Cylinder Head Quick Reference Sheet |
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-Alex77-
Samba Member
Joined: December 09, 2008
Posts: 514
Location: Finland
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| Posted: Mon Feb 22, 2021 3:43 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| AlteWagen wrote: |
Why the change in tune Roy? you posted this in the billet head thread in direct response to a post of Remmele heads
| [email protected] wrote: |
| Der6VoltFahrers wrote: |
Some pictures of my Remmele Type 1 heads.
They have 45x40 valves and 94mm bore.
They are set up for 10,5:1 compression.
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Look at all those fins!!!!
And the air flow going right down the middle in between the cylinders!!!
Those guys definitely know what they are doing....very cool  |
Looks like more than adequate air flow through the middle of the head as you point out. A custom lower deflector plate will get the cooling air where it needs to be.
Also appears that there was some changes in the center cooling slot compared to the prototype shown above
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That is type 4 head, 12.5mm more cylinder spacing.
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AlteWagen
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AlteWagen
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| Posted: Wed Jun 17, 2020 7:43 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| MitchS046 wrote: |
| what does CFM stand for all I know it is about the flow rate but what is high and what is low? |
It is a measure of how much air can flow through a given restriction over a period of time, cubic feet per minute
Low in this case would be stock flow as a baseline (heads at top of chart)
The general thought is the HP possibility is related to the amount of max flow (200 cfm could possibly get 200HP with all things being perfect).
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Grapes of Wrath $200 Engine Rebuild
Official Dual Carb Thread
Cylinder Head Quick Reference Sheet |
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MitchS046
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Joined: March 02, 2020
Posts: 114
Location: Holland
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| Posted: Wed Jun 17, 2020 3:00 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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what does CFM stand for all I know it is about the flow rate but what is high and what is low?
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Slow is smooth, smooth is fast,
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slalombuggy
Samba Member
Joined: July 17, 2010
Posts: 9340
Location: Canada
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| Posted: Wed Jun 17, 2020 10:56 am Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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My new Ultra Wedgies from CB have the same step.
brad |
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Mrblue01
Samba Member
Joined: January 09, 2009
Posts: 18
Location: Westland, MI
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| Posted: Wed Jun 17, 2020 10:22 am Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| 57BLITZ wrote: |
| AlteWagen wrote: |
| Thanks for the pics! Can you post some of the rocker area? |
Thank you AlteWagen for this informative thread!
Bonus... detail photo of C.N.C. reworked chamber option... heads are opened for 94mm...
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I am wondering why CB heads like yours have a shallow (0.010"?) step on the deck surface? I have a set of SuprPro's that are the same. I am trying to get max compression ratio and this is working against me. Anyone know? |
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57BLITZ
Samba Member
Joined: June 12, 2012
Posts: 2395
Location: DEEK - U.S.A.
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| Posted: Tue Jun 16, 2020 6:03 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| AlteWagen wrote: |
| Thanks for the pics! Can you post some of the rocker area? |
Thank you AlteWagen for this informative thread!
Bonus... detail photo of C.N.C. reworked chamber option... heads are opened for 94mm...
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AlteWagen
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