The 1500 heads respond very well to modification. The Fast Road cylinder
head features the larger inlet valve as fitted to the MkIV Spitfire, and works
well with a fast road camshaft and an uprated exhaust system.
The Standard Leadfree head, as with all of our cylinder heads, benefits from
three angle valve seats.
The Econotune Head has modified valves, throats, and combustion chambers.
The 1500 Fast Road Big Valve Head is fitted with competition 21/4N stainless
steel inlet valves and lends itself well to 'hairy' camshafts and a decent
exhaust system.
The Race and Rally heads have extensive combustion chamber and port modifications.
