Differences between the SOHC and DOHC

Originally posted by scoobys EX
this is from the Honda web site

1.6 liter, 16-valve, SOHC VTEC™ engine (115-hp HX, 127-hp, LEV-rated EX)
1.6 liter, 16-valve, DOHC VTEC™ engine (160-hp Si)

What are the main differencees between these two engines for a (2000 EX and SI Civic). internally and external can i convert the SOHC to a DOHC?

Thanks

DOHC uses two cams ... one acts on the intake valves, the other acts on the exhaust valves.

SOHC uses one cam ... one cam uses its lobes to control all exhaust and intake valves.

IM's are different and aren't interchangeable.

EM's are different and aren't interchangeable.

There's more differences, but these are some major ones.

It would basically be a waste to try and convert a D-series to a B-series.