TheSamba.com :: View topic

Sat Jan 19, 2013 4:44 pm

can you put 40mm intake and 35.5 exhaust in stock dp heads and have a decent head if you open ports up some? thanks

Sat Jan 19, 2013 4:46 pm

yeah, that's how it's been done since the ice age

Sat Jan 19, 2013 4:58 pm

do the seats have to be replaced? what is a good valve to use? new to this vw stuff or should i say havent played with them in 20 years and never did any performance stuff back in the day.

Sat Jan 19, 2013 5:01 pm

It is cheaper to buy new heads with 40x35.5 valves installed then rebuilding old heads with larger valves.

Sat Jan 19, 2013 5:02 pm

You can fit a 37mm valve on the stock intake seat, 37x32 is biggest you should go on stock seats.

PEP supplies good seats and valves, Bugpack re-packages them and sells them also

Sat Jan 19, 2013 5:05 pm

I had 40mm/35.5mm in my stock heads. I removed them and added 42mm/37.5mm today. Yes, you have to change the seats each time you change valve size. This head shop charged me $100 to do the work while I watched, which included adding neew valve guides. I supplied the parts. I was amazed at how cheap it was. He has all the good equipment to do the job right.

Ray's Cylinder Heads, 252 944 5503

Sat Jan 19, 2013 5:22 pm

i have all the equipment to do the work. i have a mill with serdi cutters as i am a harley tech. i just havent messed with bugs in years but i got the itch to get me another one. i have a bunch of stock stuff but i want to bulld a 2110 and was just wondering if i opened up some stock heads with bigger valves it would work out. just trying to go the budget route and have a little fun at the same time.

Sat Jan 19, 2013 7:01 pm

The by golly you should have no trouble at all! go for it. Maybe you should get an account setup with PEP, they probably have some good guides for harley too!