Hi all,
I'm slowly putting together the parts for a "very gentle" bolt-on engine upgrade for Molly the Tolly - NOT to go racing, just to give the old girl a little bit more vim. Call it the equivalent to HRT
A skimmed, ported head** (with either single or twin valve springs, TBD), twin HS2s, the fabled TDC SS extractor manifold and downpipe are the key bits (plus some sort of fabricated exhaust system), but I'm also looking at putting in a warmer cam to go with it all.
All the smart money says use the Spitfire Mk III profile, which comes in large bearing form from Canley or Piper. And logically (since the Mk III used HS2s) this will suit the carbs rather than asking for more than they can give.
** memory also tells me the 1500 head has bigger valves than the 1300, though until I get the original head off and compare with the replacement (which started life on a 1500) I won't know for sure...
The basic engine seems very sound - consistent 150lb compression across all four, no discernible oil consumption, rattles clonks or other nasty symptoms.
Comments, suggestions or general mickey-taking, anyone? Does any of that make sense, or am I talking my usual combination of bollox and cow-poo? Ta...