TR4 Cylinder Heads

TR 4 cylinder heads tend to suffer from severe valve seat recession; this can easily be rectified on the exhaust side. The preferred solution for the inlet side is to fit larger valves. It is well worth finishing the head to our Econotune specification and thus make better use of the flow potential of the larger valve.
Our Fast Road heads work very well on their own, producing a very torquey conversion. To get the most from the potential of the cylinder head a change in exhaust and camshaft is required. The TR4 works well with the standard twin 1 3/4" SU's; however, a change to a pair of 45 DCOE Weber carburettors will pay handsome dividends.
Our Race cylinder heads have produced 200 bhp on a fully loaded large bore engine; this equates to 172 bhp at the wheels!
The aluminium TR4 heads respond well to larger inlet valves, although this entails the fitment of larger inserts for the inlet seats. Ultimately, we feel the cast iron head offers more flow potential for full race use.