Williams Head or Megane head? 32mm or 33mm inlet valves?

[340R]

Is there a definitive guide to which head is better to get more power from i'e 33mm and small port megane or 32mm and big port williams? Or even putting the 33mm valves in a williams head? Has this been done with power figures to prove any results? I'm interested to see which will actually give more power? i have both heads to my disposal!!!
Adam

[16v_paddy]

Stan will be able to give you a definitive answer :wink:

[MAXIBOY]

it all depends on the injection system mate really..

standard run a willy head...itb's run a megane head..

megane head is better standard...but a modified willy head will out flow it without all the hassle of change inlets manifolds etc..

best of all 34/35 mm thin wasted valves can be fitted etc...

[stan]

Had a message at work from you mate, but deleted it when I was trying to get your number from it!

call me again, 01639 845009

williams are 32mm and renault only as sets of 4 at £90+vat
megane f7r are 33mm.

Ive built quite a few 33mm williams/valver heads.