i am having mancuso harley install a screaming eagle 95in big bore kit on my 04 heritage with 50k miles on it. the 203 cams, new lifters, oil pump, hydralic chain tensioners, push rods, new spring for my clutch and a race tuner. i want more power but still a very reliable bike...any comments???

 

I have that kit but I have the 211 cams, domed high compression pistons with the perfect fit pushrods, SE heads and the race tuner, I think they now call it a pro tuner. I am taking the heads back off this winter to make sure they were flowed, ported and polished right. If they aren't then I am getting them done. I would STRONGLY suggest getting the SE heads or at the very least head work to your existing heads. I also had a Python 2 into 1 pipes but I changed that this past spring and put the Samson 39" tru-duals on it. It still runs fine but I did lose a little going to these tru-duals. It's MORE than enough power at my disposal. After all, it's a Harley and I'm an old man and I just cruise unless challenged. Good luck and let us know how it worked out and what you think when it's done.

 

Those 203 CAMs are not much better than stock. a 204 would be much better with a bit of head work. The choices are limitless.

I did my 95" upgrade a few years ago and it's been solid since.


It's best to do it once.



Mike
NY

 

Just a few.

1. A better/cheaper way to go would have been to pick up a set of TC88 or 96 cylinders and have them bored to fit a set of SE flat top pistons. Most dealers have sets of those cylinders laying around and they can be had cheap. Having said that, since you appear to be locked in to the SE BB kit, verify that Mancuso will torque down the cylinders in torque plates to verify that piston fitment is within spec. The BB "kits" are not matched components and, while not likely, you could get parts that when installed do not meet fitment specifications.

2. To hit that magic 100TQ number, you need head work. A set of street ported heads from the head porter of your choice that have been decked for the additional compression that the 203 cams like installed with a .030" head gasket will make a big difference in performance and worth the additional expense.

Another option would be to pick up a set of '06 or later heads that flow much better than the '04 OEM heads, clean them up, new guide seals, a SERDI multi angle valve job and decked for the proper compression and also installed with a .030" head gasket.

3. Substitute the SE204 cams for the 203s. Some dealers will substitute at no additional cost but some will require payment for the 204 cams but the 203s can be sold on Ebay to recover some of the additional cost.

4. Sounds like the SE Hybrid cam plate upgrade is part of the upgrade? It will come with bronze bushings for the outer cam journals but the inner cam bearings should be upgraded with Torrington B148s.

5. Assume the bike is already Stage I? If not, you will need to upgrade air filter and exhaust to optimize performance.

6. Assume that the "race" tuner is SEPST fuel management system? Ask the dealer for a "break in" tune, just a couple of lower rpm pulls to check/set AFR for break in. When you have rolled up 1000 miles, have the dealer finish the job with a full tune. Just say no to the ECM flash; not necessary with a tune. Also insist that the tuner actually tune. Some will download a map, maybe tweak it a bit and call it good; that's not a tune.

7. Break in is important; rings should seat in the first 50-100 miles. Lots of accel/decel, particularly in gears 3 and 4, keep rpms under 3500 for the first 500 miles; then under 4500 for the next 500 miles.

8. Break in on HD 20W50 dino oil, no synthetic. Dump the oil after 100 miles but keep the filter. Refill with the same oil and dump again at 500 miles, keep the filter. Change to synthetic of your choice at 1000 miles and replace the filter.

JMHO

JMHO

 

Plus 1 on the 204 cams over the 203.

 

I bought my '03 Heritage new in May of 2003.

In Nov of '03 I had the HD big bore kit installed, to include the 203 cams and HD download tune.

It was much better than stock and I love the bike……

Just this last year, I bought a PowerVision for my '12 Limited and got a 2nd license for the '03. The guys at DynoJet gave me a new tune for the '03. WOW, it really woke that thing up!! Runs much better than the HD download tune!

You can go crazy chasing HP with cams, heads, pistons, etc. I like the feel of the big bore enough that when I open it up this winter to replace the cam plate and upgrade to the hydraulic cam tensioners, I'm keeping the 203s and my current tune….

I think you will be very happy with the HD big bore kit, and even happier if you get a dyno or other tune than the HD download for that kit.

Just my 2 cents

 

Sounds like a good and reliable build.

Its funny that the three closest HD dealers near home all suggest different SE cams. One use's 203's, another the 211's and the 3rd 204's or S&S 551's (pre-Auto-CR's).

With a bump in compression, the 211's like T-bone's has above, really shines making TQ all the way across the sheet. If no compression bump then the other cams will do a little better in the 2-3K rpm range.

Head Porting almost always helps if done for the cams being used.

Only other things I can think of is to make sure is that the rear cam chain U have installed has the 96''ers type Roller chain and the cam bearings are Torringtons, I now think the SE cam bearings are the same. Just Don't go with the INA's Stock 88'' bearings on an 88''er when new HP cams are installed.

U'll be glad U had it all done when U get her back, Post up Ur before and after sheet if U get her dynoed if U can. Theres a DYNO Sticky thread here in the Softail section on 1st page to post it.

Just cams on our bike made a pretty big diff, With a BB kit it will add even more and if U do the heads, U'll be amazed and wonder Why U didn't do it sooner....

Good riding and enjoy

 

If you really want to do it right you have to do the heads there is a big difference with the heads done I my self would not do the job without doing the heads you going that far do it now you won't regret it. If you do the heads forget the 203 and 204 heads go bigger

 

I had the same build on my '03 Heritage. After the build I had a Power Commander and dyno tune done to the bike and added a Vance and Hines ProPipe. The 203 cams worked just fine. the bike ran out at 92HP and 102ft lbs. I did no headwork to the engine and the power was perfect for my riding. The bike still got decent mileage on cross country rides, usually 42-46mpg. I really enjoyed the increase in power and the reliablity of the bike.

 

bowtie that's great if your happy with it but as soon as you come upon a bike with the same **** and there heads are done you will be eating their dust just saying