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[Fraca]

If the 103 head has a smaller combustion chamber is it possible and would there be a performance advantage of using the 103 twin cooled pro CNC ported head part number 16500208 with stock 110 bore and Pistons in lieu of changing to hi comp Pistons in the 110 or boring it out to 113? Or does this present another set of issues?

Thanks again Fraca

[Ridgerunr]

Port and deck the better 110 head while it's off the motor.

[HD Street Performance]

Not sure what country you are at but the availability of parts may be a factor. Best option are your heads ported by an independent experienced shop.

[Fraca]

Hi Fellas,

Thanks for the replies, when i get a more miles on it I will probably just do my heads. I wish Natli Brothers here in Sydney were still in businesses as they used to do all my head work back in the early days before you could buy off the shelf items.

Cheers Fraca

[TorqueInc]

  Not sure I would consider the 110 head better for a 110

[Ridgerunr]

What would you use John? Over the last few years a lot of discussion how much better the 110 heads flow and respond to modification. I'm confused now.

[Fullsac Performance]

If the 103 head has a smaller combustion chamber is it possible and would there be a performance advantage of using the 103 twin cooled pro CNC ported head part number 16500208 with stock 110 bore and Pistons in lieu of changing to hi comp Pistons in the 110 or boring it out to 113? Or does this present another set of issues?

Thanks again Fraca

If those heads have the same port profile as the air cooled 103 CNC heads, you are heading in the right direction. I have used a few sets of the off the shelf CNC 103 heads with great results that are very repeatable. IMHO, one of the very few hidden gems in the SE catalog.

SG

[TorqueInc]

What would you use John? Over the last few years a lot of discussion how much better the 110 heads flow and respond to modification. I'm confused now.

Depends on the rider to a degree but for most that ride 2500 to 4500 rpm I think the regular 06 heads work better.

  I have two basic head packages that work well and its an instant compression bump

No domed Pistons and no heavy surfacing and equal if not better performance

There are guys who have to have the heads pewter.....easy enough and others that can't live without the head badges.... Not so easy

To say they are better I'd say it depends

[GMR-PERFORMANCE]

Have tuned as few 110 kits with stock heads and CNC heads they run well.. For a 113 kit with the smaller chamber it can be done however be casting design ( chamber volume) you are going to get into a area of higher comp ratios and that may make cam change a must do..  Sure you can open up the chambers but at some point you are fighting the build to a larger amount than using what you already have.

Performance wise a CNC   ,  SE or who evers on a 110 flat top runs well. Now with the SE 110 kit as a bolt on there are more and more of these popping up. So results are not hard to find.

I feel that if you plan on a 113 that you use the CVO head as it is a proven item that also works very well..

[TorqueInc]

My biggest issue with the 110 heads is the amount of work and cost to rework them

Guides....and with many miles,valves

I also believe for builds that will see a lot of miles the seats
Should also be replaced.

[Rooster]

Is there a better head out there? Or can you independent guys get the stock 110 heads naked so you can build them the right way rather than have to strip them down and add all the good stuff? Just asking or am I dreaming again?

[GMR-PERFORMANCE]

Yes you can buy the head new from HD without springs valves etc.. We sell crate 113 engines and we buy new 110 cylinders and the CVO heads , rework them , and go .

[HD Street Performance]

After replacing the parts with premium aftermarket pieces the problems go away and even collateral damage such as lifter life can be greatly extended.
When a proper seat is ground on the stock seat inserts the stock exhaust valve no longer microwelds. I replace the intake, guides, springs, and ACRs if they are early versions. Then airflow work, if requested.
These folks out of the USA however have a different set of parameters to deal with. The twin cooled 103 head would put the compression up high but with the proper cam choice it could run well. This would be with a custom high quality tune and that is usually difficult to get in foreign countries.

[GMR-PERFORMANCE]

Don you mean to say that you cannot just install a V&H blue tooth FPK3 and auto tune it..   

[TorqueInc]

Is there a better head out there? Or can you independent guys get the stock 110 heads naked so you can build them the right way rather than have to strip them down and add all the good stuff? Just asking or am I dreaming again?

For some reason this seems to be an s&s superstock winter season

Oddball 116/117" combos and 3 sets slated for 110" upgrades.... 2 got custom diamonds with a 7cc dome the other got .030 kb flattops

I'd consider them an upgrade for sure