88 cylinders

glider1 said:

I have a set of cylinders for an 88 that have been bored for a 95 inch conversion . Don't know what year they are . Are all 88 cylinders interchangeable . I'd forgotten I had them, was looking thru parts one day and saw them . I bought them with the idea that I would polish them out, that's about half done, anyway I will use them on my 2006 ultra if there's no issue with fitment . If they'll fit ok I'll pickup some used heads to polish out and get some mild headwork done.:feedback:

Click to expand...

In a word.........Yes.

1999-2006 88" jugs are the same. Also the same for 96" engines....... stroke was different. Bore both 4".... Heads changed in 2005.

Just wondering , what changes were made to the newer heads ?

Irony.....I just looked and here you asked this same question back in 2011..... I never answered.

http://www.harley-davidsonforums.co...scussions/32695-twin-cam-head-difference.html


2005 heads were first year to get behive springs and lighter valves (smaller diameter/stem 5/16" vs 7mm)

2006 heads, higher intake runner.

2007 heads have an even higher intake runner/port, different flange mount for intake.

Dave63 said:

. . . 2005 heads were first year to get behive springs and lighter valves (smaller diameter/stem 5/16" vs 7mm) . . .

Click to expand...

These are the heads that had issues with the valve guide seals causing a lot of 2005 bikes to use excess oil. (at least IMO, H-D says it is acceptable)

chasarms said:

These are the heads that had issues with the valve guide seals causing a lot of 2005 bikes to use excess oil. (at least IMO, H-D says it is acceptable)

Click to expand...

45K on my 2005, no oil use issues...........

Uses NO oil between oil changes. I did hear something like that though.......now I forget where.

Dave63 said:

Irony.....I just looked and here you asked this same question back in 2011..... I never answered.

http://www.harley-davidsonforums.co...scussions/32695-twin-cam-head-difference.html


2005 heads were first year to get behive springs and lighter valves (smaller diameter/stem 5/16" vs 7mm)

2006 heads, higher intake runner.

2007 heads have an even higher intake runner/port, different flange mount for intake.

Click to expand...

Thanks Super Dave .
I have the 2005 heads on my 2002 W/G and like yours mine never uses any oil between changes .

chasarms said:

These are the heads that had issues with the valve guide seals causing a lot of 2005 bikes to use excess oil. (at least IMO, H-D says it is acceptable)

Click to expand...

Yep, Chas....you're correct. 2005 had a valve seal issue and there was a TSB, and HD replaced them at no charge.

I'm wondering if mine were replaced already.....? I'll go to dealer and get service records. Never did it before, as I knew the previous owner and never asked him or had a reason to inquire.

Dave63 said:

Yep, Chas....you're correct. 2005 had a valve seal issue and there was a TSB, and HD replaced them at no charge.

I'm wondering if mine were replaced already.....? I'll go to dealer and get service records. Never did it before, as I knew the previous owner and never asked him or had a reason to inquire.

Click to expand...

My 2005 used some oil. It was odd. I pull the plugs every oil change just for a visual inspection. On that bike, the front would be clean, tan and in perfect order. The rear would be black and slightly gummy. Not awful, but obviously the oil was blowing through on the back head.

............and the early heads had a very purposeful constricited exhaust port in order to hold heat in the engine to sqeeeeeeeak past EPA testing.
Once they opened the exhaust up to dump the heat, which did also up the hp a tick, they introduced the 6 spd, to bring engine rpm down as the emmissions went up due to that.
HD claimed the 6 spd to be a big bonus for the rider, but that was not the whole story, as if anyone has ever ridden a 96" touring bike will agree, that 6th gear is almost useless.
Just thought I'd share this with you folks.
Scott

I couldn't agree more with you on the 6-speed . Needless weight & complexity not to mention cost and durability . I always loved the 4-speed tranny with a Harley, being a tractor motor with mostly torque and little horsepower , who needs all that shifting when your not racing anyway ! Took me a while to warm up to the 5-speed .
To each his own I guess .

Drag racers of yesterday with 5", 5 1/4" stroked engines(read big torque) used 3 speed gearboxes, usually manufactured by an outfit via the name of Brad Foote.
Scott

we used a brad foote 3 speed trans in our pro stock & pro gas bike,when they cam out with the 4 speed,we tried one.ended up going back to the 3 speed.this is a 8.28 in 1998 on our 149" pro gas bike