48H or 54H with 103"? - Road Glide Forums
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post #1 of 28 (permalink) Old 03-17-2013, 07:36 PM Thread Starter
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48H or 54H with 103"?

Gathering up parts to do a mild 103" build on my bike which is currently a stock 96". Got stock 103" cylinders with SE flat tops (number on pistons is 21989-07), dragula 2-1 exhaust and stage 1 intake. Using .030" head gaskets if I go with 54H to make up for .020 smaller base circle. Which cam will work better with the parts I have? Looking for good low-mid power.
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10' Denim Black FLTRX, 103ci, ported, Dragula, Andrews 54H, Power Vision, 15" apes, blacked out.
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post #2 of 28 (permalink) Old 03-17-2013, 08:16 PM
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The 48 will pull a lot harder at low rpm's compared to the 54.


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post #3 of 28 (permalink) Old 03-17-2013, 08:19 PM
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I just had 48H installed on a 103 with stage 1. Stock heads, stock gasket. 95hp/118TQ. The 48 like less than 10:1 compression. 54 like higher compression and big cubes.

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post #4 of 28 (permalink) Old 03-17-2013, 08:27 PM
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Really depends on what kind of rider you are. If you're more of a slow and steady type that rarely turns the motor over 3500-4000 rpm and gets into high gear ASAP, I'd say go with the 48.
If you're one that's not afraid to crank 'er up a bit and would rather run in 4th or 5th gear as long as you're under 70mph, go with the 54, but make sure you do the math and set up the heads to get back up to 190+psi cranking compression.

I'd go with the .030" gaskets either way as long as the deck height at or below zero.

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post #5 of 28 (permalink) Old 03-17-2013, 08:29 PM
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take a look at the andrews 57. It was developed for the 103
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post #6 of 28 (permalink) Old 03-17-2013, 08:53 PM Thread Starter
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Like having lowend TQ, don't spool it up past 4500-5000 often. Another question is what compression ratio will I be at with the .030 gaskets? From what I've read it should be around 9.8:1 correct? Stock 96" is 9.2, with stock heads and 103 BB it should be 9.6:1 and with .030 hg 9:8:1 I think?
Thanks for the responses

10' Denim Black FLTRX, 103ci, ported, Dragula, Andrews 54H, Power Vision, 15" apes, blacked out.
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post #7 of 28 (permalink) Old 03-17-2013, 09:00 PM
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103 is 9.6:1 if you use a .30 headgaskets it will bump the compression uo to 10.1: 1. I ran woods 222's for a little bit and loved the torque but the power fell like a rock @3800 rpm. I swapped them for 555's with .030 headgaskets. I liked it a lot more. I had this set up in my street glide. I pulled them out when I traded it in for my rg. I haven't decided if I'm going back with the 555's yet. I might try the 57's
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post #8 of 28 (permalink) Old 03-17-2013, 09:06 PM Thread Starter
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Part of the reason I was going to use the .030 gasket is to make up for the .020 smaller base circle of the 54H. Im also getting some minor porting done as well.

10' Denim Black FLTRX, 103ci, ported, Dragula, Andrews 54H, Power Vision, 15" apes, blacked out.
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post #9 of 28 (permalink) Old 03-22-2013, 05:53 AM
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Want it all from bottom to top?
Install a .030" head gasket and a set of S&S .570's.
With the base circle of that cam, no need for adj. pushrods(unless for ease of install).
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post #10 of 28 (permalink) Old 03-27-2013, 02:07 PM Thread Starter
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So I have not pulled the trigger on cams yet. I am not interested in putting comp releases in this thing so I will probably stick with .045 headgaskets (9.7-9.8ish:1). Should I still stick with the 54H or possibly go for 57H? Or will the S&S 570's work ok with the little lower CR?
Thanks for the help all
Andy

10' Denim Black FLTRX, 103ci, ported, Dragula, Andrews 54H, Power Vision, 15" apes, blacked out.
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