Engine Pro's . . .
 

UPDATE:
45,000 miles now, bike is running well after choosing the 204 cams. Still doesn't run as strong as I'd like and mileage is TERRIBLE.

2005 ElectraGlide 88 cu. in.
SE 204 Cams
SE Air Cleaner with K&N Filter
SE 64910-99 Slip-on Mufflers
Yost Power tube in stock carburetor
New Cam tensioners
Requisite Baisley Spring

The bike runs well, but not what I expect - the engine is happiest at about 80mph, seems to be lacking a little power at lower RPM's - I know the carb is still a little too rich, must be the High-speed jet, because when accelerating hard, I get a little surge if I back off the throttle.

Really have questions for engine guys with experience and knowledge . . .
I have a set of 2006 heads (used, but like new) that I want to install this winter. I have to do something with the Valve spring seals anyway - have the 05 high oil use issue. Can I do anything myself with the 06 heads? I know enough to not try and port them, but polish? grind the ports to match the intake? Which valve stem seals should I go with?

How about ignition? Is there a USEFUL upgrade to the stock upgrade? Remember, it's a carbureted bike . . . Can I gain efficiency and power with some aftermarket ignition?? Leaning toward the SE performance ignition . . .

And - if I change the heads, do I have to change the base gaskets?? I know I should be going to 95, but on a tight budget for this year.

Thanks for all the help - this site has been a terrific resource . . .

It doesn't sound as if you have had your bike set up by a skilled tuner. In my experience that is the magic ingredient to get the best out of any modifications. If you call in the Tech Engines section you will find a few sponsors there who can give you direct advice, also do whatever work you decide on for you.

Read through this thread, especially #4. Some light head work be worthwhile on your 06 heads, boring to 95" with a bump in CR plus suitable cams will give a real boost. Have the work done by the same people, so all the components match each other, then get your bike tuned by a reputable local shop.

Another low cost mod install .030" head gaskets.. This will raise your Compression ratio. the stock gasket thickness in .045" .. equates to having your heads shaved .015" but without the big $$$'s

204s are a little much in a stock compression 88 so it will be pretty sluggish down low. The '06 heads are a good upgrade but ya really need to address the compression ratio with milling or at least a thinner head gasket.

Fair point, have not spent the $$ on a tuner yet . . . that will come . . .
I'm seeing a few head porting outfits and am considering that route - can anyone advise the optimum compression ratio for the 204 cam?

When selecting a cam or building a good strong motor you have 2 key factors to look at.. Static compression ratio and corrected compression ratio. There are some good articles that will explain these key points.

here is some good reads.
http://www.hildrethperformance.com/a...mpression.html

chose the 204 cams with wide recommendations . . .
Thanks for the link, I have some studying to do!!
When I change out the heads, do I have to change the cylinder base gaskets??
How about the ignition question - anyone?

I would change the base o rings as a precaution. While you are that far in I would check piston to wall clearances and bore taper . A fresh hone and a set of rings would not be a bad idea at this point. I would run a aftermarket ignition module. There is a lot that can be had by tuning your ignition curves. A qualified tuner defiantly will make it right ! I would also look into the dynojet thunder slide kit. The composite slide in the kit really helps with quick throttle response.