I think I know the answer, but I’m looking to bump my 88” Dyna motor to 98” likely through Hillside.

Ive got a good plug on some Screamin Eagle HTCC heads, but if I understand I can ONLY use HD Screamin Eagle high comp pistons correct? Which would NOT allow me to run 98”? If I understand, it would have to be 95” bore of the cylinders for the HD pistons that are available?

There are no aftermarket pistons that work with these heads in a 98” bore size?

 

JMHO but pass on the HTCC heads; more trouble than they are worth. Work with Hillside and your OEM heads with the right cam and compression; much better option with a reliable outcome. The last 98" motor I built is a 115/115 motor with worked OEM heads and CP pistons with a 6cc dome.

 

This is super lame, but I want the “Screamin Eagle” tag on the side of the heads. Working on a tribute bike and it needs it. Wonder if I can find an engraver 🤨 haha

Finding the original “non HTCC” heads is impossible. But you’re right, seems like they have their issues.

 

Actually they are part # 16927-06 (non HTCC) but for 06 later....these are too big for my 04 right? These are for 103”?

 

The 103" is irrelevant, you can use them

 

Appreciate the response. Can you elaborate?

When you say I “can” run them, I know it bolts up, but I want to make sure the bike isn’t running like garbage either.

I get that there are better and cheaper ways to go about it, but with a little work these can be decent I believe?

 

IIRC, those heads are the early SE Pro Performance heads that were milled to 72cc chambers; however, rare and the PN is obsolete but if you can find a set, grab them. If you are just hung up on the SE label, the Pro Kompressor heads (17044-08A) might work for you. 10.5 static CR with stock pistons so cam selection should take that into consideration; early intake events will eliminate some cams.

 

I have a brand new set in the aging cabinet for that next someday build. Glad to see you like them.

I do also have a brand new front and rear but one is black and one silver. If the OP wants to go the powdercoat or painting route, they are on the block.

FYI the Kompressor heads were just decked stock heads with springs.

 

You may be familiar with the "Hippo" build but if not it was a bolt together combination of parts that hit the 100/100 mark every time with the right exhaust. This was back in the day, late 90s, early 2000 when those numbers were not as achievable and they are now. The combination was to bore to 95" (98" was years down the road), SE Performance heads out of the box, stock head gasket and S&S 570 cams. With early pistons down in the hole about .005" static CR was a bit above 10; corrected about 9.3/9.4 and CCP about 195psi which was fairly aggressive at the time. Of course hi-flow air filter and the right exhaust completed the package; the 570 is an exhaust sensitive cam. IIRC, Hippo also fly cut the valve reliefs in the flat tops and recommended compression releases.

The build was named after a member of the HTT forum who has long since passed; his forum name was Hippo; I have forgotten his true name. Hippo was the master machinist/builder with Short Block Charlie's in Phoenix. IIRC, Hippo did one of the first 98" builds sometime around 2004; it was quite the talk on HTT at that time; everybody worried about spigot thickness.

I am aware on the Kompressor heads but the OP was hung up on the SE label; just one way to do it.

EDIT: Just thought I would add that the early SE Performance heads flow as well as the '06 castings. I recall seeing a thread wherein WFO Larry confirmed flow. TC bathtub chambers and EFO ports and apparently there was enough metal to do almost anything a porter would want to do with those heads as well.

 

Curious if you remember the exhaust in that hippo build.
Sporties still use the bathtub chambered Buell heads. Did they originate there or were they used before buell on these SE heads? Sporties started using them in 04 on the 1200s but buells before that. Not sure when tho.