Are they the same as regular B18c's or not? A couple of different publications say the 'the valve seat was changed from 60 to 45 degrees.'

The cyl head section in the helms shows the same valve seat specs for B18b, B18c1 and B18c5. But if you look in the the first few chapters, the specifications section, the ITR valve seat widths are different. Since valve seat angles aren't normally listed in this section though, there's no way of knowing about them.

So anyone know what the deal is with ITR valve seats?

 

From memory I believe it is 30-45-65 for ITR intake.

 

The valve set angle was changed from 60 degrees to 45 degrees to help aid in airflow...

 

Negative.

 

So, you're saying that they were'nt changed?

 

phil let em kno

 

i edited it for you so you have correct info

 

Thank you.

 

It's part of the "package" Honda to work together with more lift and duration from ITR cams, increased compression, raised rev limit, revised intake valve etc.

Remember, it works as a package.

 

I definitely understand that.

Actually I don't even have a B motor. Interested in the H22 Type-S since it got the same modifications (compression, lift, minor port work, higher resulting peak power etc) as the ITR did, and has the same thing listed regarding revised valve seat angles in it's literature. I wonder if the seat specs are the same as the ITR.