There are several sponsors of HDF who are skilled engine tuners. I suggest you contact one of them and talk through your options. You can probably buy a package of suitable pistons, ported heads and cams, all matched to each other. Unless you plan on going racing your current heads can be reworked to give very high performance, no need to replace them.

 

[quote=d-roadglidr;10660556]
Question is, which heads? And what is HTCC?
Quote]

HTCC = High Torque Compression Chamber and is a line of Screamin Eagle parts. If you purchase the HTCC heads, you must purchase the HTCC Pistons and you must purchase the HTCC Intake to work with the D port intake.


When I built my '03 Twin Cam I created the following spreadsheet to help me decide where I wanted to be and how much it would cost me. May be neneficial for you to try something like this....

 

That didn't look anything like what I thought I posted, try this....

 

Thanks for that!

 

Sort of a side-note to this thread I'd like to ask if there really is any benefit to modifying heads for the 204 cam. I thought that since this is such a "baby" gind there would be absolutely no point to touching the heads. I just installed a 204, bored to 103 and installed the heads back on with a thinner '036 gasket. Would I see any improvement with headwork, even a quick $299 job from Big Boyz?

 

Yes, but install a set of 1.7 ratio rockers for more. Modifying heads will improve performance with OEM cams; anytime you improve volumetric efficiency, you improve performance.

 

Yep , would be a bolt on , think you might need to change the exhaust flange, not sure though. Easy inexpensive solution .

I have a set of 07 heads if you might be interested.

 

Best heads are your OEM heads ported and machined to match the compression sweet spot for the selected cams. A set of the later OEM heads would also be a good move and economical but the OEM heads should be torn down, chambers measured and equalized at 74-76cc(9.6-9.8 static CR), SERDI valve job, new guide seals and installed with a .030" head gasket. This if displacement is held at 88".

You are mistaken about the bigger bore not making any difference. If you are pulling the heads, you are $300 from bored cylinders,new pistons and the cheapest torque you can buy. More cubic inches equals more displacement; the relationship is linear. If you were to bore to 95", same logic applies to the heads except chambers would be set at 80-82ccs.

Another upgrade would include a set of 1.7 ratio rockers to give the 26 cams a bit more lift which you could use if you improve the flow of the heads. You should also upgrade the inner cam bearings to Torrgington B148 and of course replace the outer cam bearings in the cam plate.

I would also suggest changing the cam tensioner shoes and replace the OEM shoes with the CYCO shoe and install the Baisley pressure relief valve spring in the cam plate.

JMHO

 

You would with a larger intake valve.

 

Intake flanges, exhaust is OK.