Put a large pot of salted water on to boil. Slice the garlic very thinly.Chop the parsley very finely.Cook the pasta until al dente, usually about 8-10 minutes.Put the olive oil in a large pan, add the garlic and cook over a very gentle heat with the chilli.  Do not colour the garlic or it will become bitter.  Add the clams to the pan and place a lid on it.  Shake slightly and then cook for a further 3-4 minutes or until the clams have opened (discard any that do not open).Add the cooked pasta and the parsley.  Season and toss well. 
To Serve: Serve hot with some fresh crusty bread and a drizzle of extra olive oil.