a few things for ruredi. im not sure what people are worried about re: stressing about year of block for emmissions etc. I have a 93 model sr in my 1600 and the engineer was going to pass with aftermarket ecu.

call an engineer (sanjay) and get him to give you an idea of what you need to do. tell him only what he needs to know, not about all the plans with different internal bits, just capacity or engine. thats the best plan so you know you will be right

about all this spruking on the Z head... its common knowledge that it is a bit of a dud. its great for crossflow design but thats about it. its designed around good emmissions rather than performance. the ports are more restrictive than L series, can't be ported much because of water jackets and the combustion area issues equal a poor burn.

im not trying to bag the z head just for fun just counteract D's tent pitching rant about them every other post. dont get me wrong D is a wealth of info, i just think that if you take what you like out of info on the internet you;re not getting the full story. as long as you do your research and are happy.

you are welcome to come for a spin in my car and see what 220kw in a datsun feel like, although its not really similar to a revvy motor in a lighter solid axle car - itll make you smile