whats the difference - screaming eagle 103 heads vs regular 96 heads?
planning some work for an 07 ultra.
I know you can use your regular 96 heads if you do a 103 upgrade. but I also know there are screaming eagle 103 heads that have fancy 103 logo's on the side of them. do these screaming eagle 103 heads have any functional difference in terms of things like polished ports, large valves, spring differences for cams beyond 255's, machine work to change the compression ratio's, etc. does anyone have a part number for them? thanks for any info.
Check se catalog. The dealer can also look up part number of both heads. I think only difference is decompression releases. The 110 and MBA. Require 10.5-1 pistons for combustion chamber squish to work . I put MBA and new 10.5 pistons in my 103 with 255 cams got 98 go. 107 tq. . Think dyne guy screwed me royaly, map when I looked at later from vci module was completely basic. No timing changes, no ve changes. Nothing at all in program was tweaked. Figure hp could have been (5 higher and tq a couple higher 400 dollar rip off
they do have the logo and the valve springs are for a higher lift something like 589 not to sure though. pretty much a stock head. i had them on my 103.
been googling around and I think I found the pdf for it. looks like definitely some compression differences as well as being incompatible with SE high compression pistons.
what is the difference between the 96 inch stock heads and the 103 heads. are the valves the bigger?I have a 2009 ultra classic that I need to pump up to 103 is going to use the same 96 in.³ heads. any help would be appreciated.
The 103+ SE heads have much bigger valves than the stock 96" heads. You could also send you heads out to be ported and polished. There won't be much difference in price to get yours reworked or buy new performance heads.
I have been searching for the answer to the question what is the difference between 103 Harley-Davidson heads and 96 in. heads.(Stock Harley-Davidson heads)
Here is the answer very simple, the only difference is the compression release valve. The valves are the same size the springs are the same only difference is the 103 has come with electronic compression release. Your bike will have part of the wiring needed to use the electronic compression release. Mine does, it is a 2009 Electra glide. Yours may or may not. You need to check with your dealer. The problem I see is you also have to buy another wiring harness to go along with the wiring harness you got which will add to the cost of your rebuild.
Most 103 kits come with 10.1 compression pistons or 10.5.
I have decided to go with the manual compression release rather than electronic. I have used them before they work great. You have to remember to do it, but there will never be any electrical problems with them.
Changing and 96 in. engine over to a 103 in. is definitely going to be an advantage. I think we all realize that the 96 in. Harley-Davidson motor is a dog. You can cam them up and they will run okay at a higher rpm. But for most of us torque is where it's at.
My 2009 ultra glide classic with a 96 "engine, already has a TTS tuner, 255 SE cam, thunder headers, screaming Eagle air cleaner and adjustable pushrods. I'm going to include a list of parts other than these you would need to build a 103.
The 103+ SE heads have much bigger valves than the stock 96" heads. You could also send you heads out to be ported and polished. There won't be much difference in price to get yours reworked or buy new performance heads.
Dennis
I have found that 103 stock heads and 96 heads are the same thing all except for the release valves. Screaming Eagle heads may be different. I did not ask about them I cannot afford another set of aftermarket heads. Thank you for your input.
07-16-2011, 10:02 AM
whats the difference - screaming eagle 103 heads vs regular 96 heads?
