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escott427
Samba Member
Joined: November 16, 2021
Posts: 5
Location: Texas
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 Posted: Wed May 14, 2025 1:34 pm Post subject: Re: Which cylinder heads? CB, Mofoco, Steve Tims, others? |
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I'm in the same boat, Which ones to choose? Mine is 78X92 ,2074cc, W120 Engle cam, 1.25 rockers, 8.5-9 to 1 compression , Dual 40IDF's-(or 44s if needed) .Do I need something with 42 x 37.5s and 200cfm or will Panchitos 40x35.5 sor Empi StgII's work better? What's the groups opinion?
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Brian_e 
Samba Member
Joined: July 28, 2009
Posts: 3899
Location: Rapid City, South Dakota
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| Posted: Wed May 14, 2025 1:56 pm Post subject: Re: Which cylinder heads? CB, Mofoco, Steve Tims, others? |
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| escott427 wrote: |
| Mine is 78X92 ,2074cc, W120 Engle cam, 1.25 rockers, 8.5-9 to 1 compression , Dual 40IDF's-(or 44s if needed) .Do I need something with 42 x 37.5s and 200cfm or will Panchitos 40x35.5 sor Empi StgII's work better? What's the groups opinion? |
Tims S1's, and make it 9.0-9.2ish with a .040" deck height. Switching to 44's would be good also.
Brian
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BFB
Samba Member
Joined: November 03, 2014
Posts: 2519
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| Posted: Wed May 14, 2025 8:38 pm Post subject: Re: Which cylinder heads? CB, Mofoco, Steve Tims, others? |
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| Brian_e wrote: |
| BFB wrote: |
Thats an interesting split grind, do you have a cam card for that? I’d be interested in seeing the events. I never understand why so many vw cams, when they are split run less on the exhaust, considering the typical vw exhaust valve and port youd think theyd do the opposite, like Crower’s 61005.
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Here is the card for a 218/119. Kick ass cam. Especially with single barrels.
https://webcamshafts.com/pages_vehicles/automobile/volkswagen_install_data/tc_000670_002743.html
The reason for the opposite split from typical v8's, is the VW exhaust port is overly efficient. Run a split duration to tame it down a bit, and help the intake keep up. On the flow bench you can really see it. It takes very little work to get a stock exhaust port to work really well. Not so easy with the intake. Ideally you want about a 75-78% E/I flow difference. The split cam and help get that ratio back in check.
The 42x37.5 heads could really use the split cams. Lots of those heads are up in the 88-92% E/I flow ratio. Nice fresh intake charge headed right out the tailpipe because the exhaust is too efficient.
T4 VW heads have the opposite problem. Super shitty exhaust ports, really good intake ports. They have split cams with bigger exhaust profiles.
I never understood the Crower cams.. Must not have been designed with head flow numbers at hand.
Brian |
Thanks for the link & info
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