Street Ryderz
Well-Known Member
You have to look back through the older posts, I've cc'd most of the heads and given the numbers here and have gave out good port maps for both 38 and 40mm strokes and both good all around numbers and more aggressive one's.
A port timing calculator like Lambretta's is a very useful tool as it lets us play around with the values/numbers and see what's needed before even touching the jug saving time and money.
Check your piston crown height (the edge of the piston) in the cylinder as many are 1mm or more below the deck and this coupled with even a true 6cc head would be in the 6:1 range.
prices all over the place between the Clones and the original is there a difference other than the price?
