A free flowing head also greatly improves performance by smoothing out the intake and exhaust ports giving the head improved flow characteristics. Valve seat enlargement is one improvement. Intake and exhaust ports can be enlarged but not hogged out like the English Tunnel as power will be sacrificed. Ports and chambers can be polished for improved flow and the size and shape is open for discussion and advise should be obtained from the professional or experienced engine builder of these cars.

A quick and cheap modification is to had the cylinder head decked by removing a small amount say; 0.010in. Your compression ratio will increase slightly, don't over do it as the milling will alter your timing for every bit taken off.

The EB3 head was introduced in 1978 with larger valves and improved intake and exhaust ports with deeper combustion chamber and domed pistons to match the larger chamber. The EB3 cylinder head can be used on the EB2 block as long as you use the EB3 pistons with it. If you don't use the EB3 pistons the compression will be too low. The EB3 head will give you a greater increase in power when combined with a better carburetor, exhaust or valve train. 

Check out Bottom End mods for further discussion on power gains used in combination with parts from the 80-83 1335cc engine.

Camshafts, can greatly improve your performance and there is much to consider when getting a new cam or regrind. Check out Elgin Cams to help to figure out more about your choices at http://www.elgincams.com/campaper.html

Modifications might include the camshaft of course, rocker arms, valve springs and valves. Installing a high performance camshaft normally has greater lift and duration than stock ones, as well the timing will be different. Increasing valve lift will create a clearer path by the valve head in to the cylinder, allowing for more fuel and air to enter and increasing exhaust valve lift opens the way for more excavating of the cylinder during the exhaust stroke. Your end result will be more power.

These are custom made items these days unless you are lucky enough to find one from Jackson Racing or Norris Cams. If you were one of the lucky ones you might have bought a custom made one by Bryon from your old stock cam pulley. The general use is to advance or retard the valve timing to give somewhat more power or shift the engines strength to a higher power band or a lower power band. With the adjustable cam pulley you will be able to better fine tune the cam to motor and its combination of performance parts.

Larger valves free up the flow of the intake mixture and exhaust gases, thus increasing power.

Stronger valve springs is advisable for a racing camshaft to prevent damaging valve float that may even make contact with the piston. Contact information is listed below if you need help finding stronger springs.

R&D Springs
17710 Bangor Ave.
Hesperia CA. 92345
(760)948-4698

Iskenderian springs, part #455/456 

They are actually for a Ford 2 liter motor (Pinto), but have worked fine for years in 1200 motors.