I'd like to know , if anyone can tell me, if a Harley Davidson SCREAMIN' EAGLE Pro Twin Cam ACR Performance cylinder heads part number 17165-08 would be a good match with my 103" stage II screaming eagle big bore with SE 255 cams and should I expect to gain much torque and power from this upgrade? Or are they basically the same as my original 'o8 fatbob heads only with stronger springs and automatic compression release.

Please i neeeeed to Know! lol I'm addicted to upgrades!

 

IIRC, those heads were new for the '08 model year. 95cc chambers and even with the early close of the 255s, you will be lacking the compression those cams like. Static about 9:1, corrected below 9:1 and cranking mid 170psi.

Have your heads worked instead. JMHO.

 

Send your heads to a reputable builder, (Hillside, Deweys, WFO Larry etc) and have them ported and worked to match the cams.If you just start throwing parts at it you'll be disappointed. #2, Factor in a GOOD tune as part of your build budget. You'll be surprised at the gains that can be made with just a good tune.

oops sorry, it looks like DJL beat me to it

 

Thanks guys, i was at the harley dealer today and they said it would work well if I switched out the cams for 259 istead of 255's which were part of my 103" kit. With those heads i will also need a wiring harness and gasket kit, and the 259 cams + installation would take me to 1600$ in canada. I think the same H-dealer quoted me 1000 to 1100$ last year for the porting and polishing job with the compression releases installed, So I'm glad you guys kind of woke me up, jostled my memory there!

I have a power vision tuner which takes some time but pretty much dials in the tune for me without putting it on a dyno.


Now lots of folks tell me if I do the heads I will always be forever fixing stuff and opening the engine to replace parts and stuff because she just isn't built for that kind of punishment, is that still true with these newer bikes? '08 fatbob with 103" stageII SE kit with 255 cams and a clutch spring.

 

Not true. Get your heads in the hands of the porter of your choice and have them worked for one of TMans cams, either the 555Torkster or the 590, get the bike tuned ans away you go.

 

Thanks man good to hear, gonna wait and have it done this winter!