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  #11  
Old 11th August 2007
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bigdaddy1988 bigdaddy1988 is offline
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Sportster/Buell Model: 1200 sportster
Sportster/Buell Year: 1988
Sportster/Buell Model #2: 1984 sportster 1000
Reputation: 10
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Any good harley modification book will tell you what was just stated above check out motorbooks Harley davidson sportster pg49 "a modified 883 head can easily be made superior to a stock 1200 head. with careful mods the 883 converted to 1200cc outruns a stocker in Every way"
Do your reasearch
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  #12  
Old 15th August 2007
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dave76 dave76 is offline
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Sportster/Buell Model: Sportster XLH 1200
Sportster/Buell Year: 1990
Sportster/Buell Model #2: Sportster XLH 1000
Sportster/Buell Year #2: 1976
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But,,, what if you modify the 1200??? If were talking stock 1200 vs. 883/1200mod, i'd bet the 883/1200 mod would be faster too.
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  #13  
Old 16th August 2007
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Sportster/Buell Model: FLHTPI
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Dave, the problem with the 1200 is that the chamber is already pretty much defined. Because of the extra material on the 883 heads, they can be dug out much more, and to the specific designs of the company doing the job without sacrificing wall integrity.
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  #14  
Old 17th August 2007
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addertooth addertooth is offline
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Sportster/Buell Model: 883 hugger 1200 convert
Sportster/Buell Year: 2002
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apples, oranges, bananas...

Stock to stock 1200 heads outflow 883 heads
stock to stock 883 heads have a better squish zone than 1200 heads, allowing a higher compression ratio without the risk of pinging...
stock to stock 1200 heads have larger valves, and higher better flow above 4500 rpms....
stage 2 to stage 2 1200 heads require less machining to achieve the same flow numbers as a 883 head
stage 3 to stage 3 (welding up the ports and re-machining, oversized valves, recontoured combustion chamber) The award goes slightly to the 883 head...
Stage 1 XB (or 2004 and up 1200 head) versus stage 3 883 heads... The XB style head performs better... stage 2 and up XB heads are dramatically better than anything that can be achieved through machining or voodoo with an 883 head.

Now real world... You are a smart guy with a dremel tool.... You can get more performance HOME porting a pre-2004 1200 head than you can with a 883 head. Read my signature before you ask how I would know.

If I had it to do again... I would use an XB (post 2004 1200) head to do my performance build.

If I want to get into the 70 HP club, and I want to do it cheap... 883 heads... 3.500 forged lightweight pistons... Cams.... Jets for carb....Gaskets.... Less than a thousand spent, and you will gain about 35 horse assuming you have a good exhaust and breather already.
With your Low 883 gearing you will be beating the factory stock 1200s on a stoplight to stoplight drag race.
You will have to figure out what kind of rider you are... will you want a few more HP, and be satisfied, or will this HP pursuit be a never ending quest. Most people fall into the latter catagory. If you are the latter type.. start purchasing parts so that you won't have to remove them at a later point.

Addertooth
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2002 sportster hugger, 3.502 bore, 10.5:1 JE pistons (3.501), Andrews N6 cams, home ported 1200 CC heads (optimized for scavenge), Mikuni HSR42, Dyna Twin Fire II ignition, Big Bore intakes breather, Samson Caliber exhaust. Currently ultra violet pearl with silver leaf and hand pin striping (soon black cherry pearl with red candy over silver flames, I bought all the paint and the tins, now lets see if I can get the time to actually complete this).
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