Question about 103 build - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 15 (permalink) Old 02-28-2011, 10:01 PM Thread Starter
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Question about 103 build

I am getting ready to do a 103 build or rather have it done. Here is what my wrench is telling me, keep in mind I have never dealt with this guy but was referred to me by a couple of people that I trust, port and polish heads, open up intake to match tb, punch out cylinder se flat top pistons, .018 head gasket and compression releases. I was wondering about the .018 head gasket does this sound right? I am currently running v&h big shots but have Rinehart tru duals with the stepped head pipe on order, v&H air cleaner and am getting ready to take out power commander III and go to tts master tune, and I am running Andrews 54H cams. With this set up what can I expect Hp and Tq and how do you think it will be as far as rideability. Thanks in advance for any input.

07 Electra Glide Classic, Black Cherry, V&H BigShots Duals, V&H Stage 1, Power Commander III and more still to come.

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post #2 of 15 (permalink) Old 03-01-2011, 05:43 AM
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The .018" cylinder head gasket seems quite snug.
We use .030" here almost exclusively.
As far as a power prediction, without knowing mechanical compression, and cylinder head air flow, I couldn't say.
Scott

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post #3 of 15 (permalink) Old 03-01-2011, 03:43 PM Thread Starter
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Yea I thought .018 head gasket was pushing it but this guy is a performance engine builder so I was giving him the benefit of the doubt. I will question him on it a little bit. Thanks for the input.

07 Electra Glide Classic, Black Cherry, V&H BigShots Duals, V&H Stage 1, Power Commander III and more still to come.

If you don't think every day is a good day just try missing one.
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post #4 of 15 (permalink) Old 03-02-2011, 05:57 AM
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Perhaps his combo has the piston below cylinder deck surface to warrant it's use.
Certainly agree with getting the piston close the head, as the closer you can put it, during normal operating temps, the less chance of detonation you'll experience, when working with an engine that has substancial compression.
Scott

"....3 dueces and a 4 speed..........and a 389"..........
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post #5 of 15 (permalink) Old 03-02-2011, 04:49 PM Thread Starter
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I spoke with my builder and he said that he was only doing this to get the compression up without milling the head. He said he would mill the head if I would rather but it would just cost more money. So with that being said which is my better option. Thanks again for the input.

07 Electra Glide Classic, Black Cherry, V&H BigShots Duals, V&H Stage 1, Power Commander III and more still to come.

If you don't think every day is a good day just try missing one.
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post #6 of 15 (permalink) Old 03-03-2011, 05:23 AM
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If an increase in compression is needed, then reducing chamber volume, by re-surfacing them, or a piston, is how we do that here.
While calculating the total cc's needed to have a given combination run to it's effectiveness, we always factor in the use of a .030" head gasket.
Scott

"....3 dueces and a 4 speed..........and a 389"..........
Goodson H-D Cylinder Head Tooling Manufacturer
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post #7 of 15 (permalink) Old 03-08-2011, 08:57 AM
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A 103 with stock CC chamber heads and a .030 will get you right at 10.1 compression. ( lets say you are 5-6 down in the hole you are still at 9.9 approx) If larger valves are installed you may end up with more chamber volume. All based on what valves the AVV intake 7 mm add about 1 cc as they are a deep dish. Really if the pistons are way down the cylinders should be machined to set piston TDC. GO from there.
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post #8 of 15 (permalink) Old 03-09-2011, 05:44 AM
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How in the wide-world-of-sports, does one have the slightest idea what valves are in the heads????????????????????????????
Did you consult your Magic 8 Ball?????????????????????

"....3 dueces and a 4 speed..........and a 389"..........
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post #9 of 15 (permalink) Old 03-09-2011, 09:01 AM
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It was a example nothing more, If you had read the post the heads where re worked. So without knowing what was done how you can say what compression would or would not be.. further more I am sure he can ask his builder what the cc volume of the chamber is. His head porter should now what that is....... Would be just a basic deal. No magic about knowing what parts are used.

Last edited by GMRPERFORMANCE; 03-09-2011 at 05:33 PM.
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post #10 of 15 (permalink) Old 03-10-2011, 09:22 PM Thread Starter
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Ok, I spoke with the builder again and was told he is not going to change the valve sizes. He is just going to port and polish, clean up the seats and match the ports and use a .028 head gasket. I'm not sure if this is any help but I appreciate any input. I am just not saavy abouts heads, never messed with them.

07 Electra Glide Classic, Black Cherry, V&H BigShots Duals, V&H Stage 1, Power Commander III and more still to come.

If you don't think every day is a good day just try missing one.
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