Installing Andrews 57 on a Dyna 06
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Road Captain
Joined: Aug 2018
Posts: 589
Likes: 93
From: Stockholm
Pumped the S&S lifters with oil, filled the holes with assembley lube, and installed the lifters and the covers. Now just waiting for the Cometic MLS 0.030 from USA.
Last edited by OakMountainRider; Feb 9, 2026 at 12:18 PM.
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Road Captain
Joined: Aug 2018
Posts: 589
Likes: 93
From: Stockholm
Question about intake milling
Heads lowered from stock positon:
Earlier milling 0.011. Lowering 0.011
0.030 MLS. Stock 0.045. (0.045-0.030=0.015) Lowering 0.015
Total lowering (0.011+0.015=0.026) 0.026
How much milling on manifold intake surfaces?
Read somewhere half of the head lowering. So then I should ask the machine guy to mill the intake manifold surfaces with 0.013 (0,33 mm). Am I thinking right here?
Appreciate to hear from your knowledge.
Thanks in advance.
Earlier milling 0.011. Lowering 0.011
0.030 MLS. Stock 0.045. (0.045-0.030=0.015) Lowering 0.015
Total lowering (0.011+0.015=0.026) 0.026
How much milling on manifold intake surfaces?
Read somewhere half of the head lowering. So then I should ask the machine guy to mill the intake manifold surfaces with 0.013 (0,33 mm). Am I thinking right here?
Appreciate to hear from your knowledge.
Thanks in advance.
Last edited by OakMountainRider; Feb 10, 2026 at 10:27 AM.
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Road Captain
Joined: Aug 2018
Posts: 589
Likes: 93
From: Stockholm
Ok, thanks. Trying to figure it out myself, and I think Chat TGP is not right. It told me 0.013" on each side. To me it looks like 0.0058" (0,147 mm) on each side, when I draw it geometrically. And it is not much as you say.
Last edited by OakMountainRider; Feb 10, 2026 at 01:29 PM.
Stellar HDF Member
Joined: Sep 2007
Posts: 2,463
Likes: 674
From: Vancouver Island B.C.
Yup, I've got a set that are cut .092. Took way more than a single stroke but just fit.
Tourer
Joined: Feb 2009
Posts: 298
Likes: 103
From: King Island, Tasmania
I was being conservative lol
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Thread Starter
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Road Captain
Joined: Aug 2018
Posts: 589
Likes: 93
From: Stockholm
Correction
Or to be more exact, pull 59 % from how much you lower the heads from stock height and mill the intake surfaces with that (0.026-59%=0.01066)
Last edited by OakMountainRider; Feb 11, 2026 at 07:29 AM.
HDF Community Team
Joined: Jun 2006
Posts: 12,779
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From: san antonio
Try to fit the manifold before doing any milling. I have installed intake manifolds with more of a "drop" than the OP is dealing with without any "milling". The OP will be kicking himself if he cuts the intake and has leaking seals in the future; just sayin.
BTW, I have caught ChatGpt getting things wrong several times. I suggest that the OP reply to Chat Gpt and tell it that several members of a Harley Davidson technical forum have advised that the intake does not have to be milled and see how Chat Gpt replies.
BTW, I have caught ChatGpt getting things wrong several times. I suggest that the OP reply to Chat Gpt and tell it that several members of a Harley Davidson technical forum have advised that the intake does not have to be milled and see how Chat Gpt replies.
