[blush] cheers guys :look:[blush]

Yeh i agree!, cheers for that j1400

j1400 you are a mechanical god. your posts make good reading!

It depends on two factors.
Compression (nominal)
Port design. (significant)

Putting a 1.2i SPi head on a 1400 blocvk will ofeer little improvement as the port design remains the same and only compression will be raised. (square port)
Putting a Early 1.2/1.3 head on a 1400 bottom end will gain performance provided the head that was on previously was a carb'd engine, as you will be switching from sqaure ports to catherdral ports, this is only provided that the inlet manifold is also swapped for the correct type for that head.
Putting a MPI 1.4 head will give a gain in performance as they have round ports (best for flow) and also have larger valves. However you cannot get a single carb manifold for this type of head and you would need to modify a 1.3SR manifold to suit.
Also is worth mentioning that is the bottom end is well used then raising the compression won't help things to much as it will increase the strain on the rings wearing them much more rapidly.
Have a dig round on nova load, they have loads abotu the 8v tuning.

This doesn't apply to the 16v heads as you cannot swap a 1.216v head on to a 1.4 bottom end.

ok cheers greg, tried gettin on mig here in colege to do a search but i cant,
thanks again m8
jon

and here http://www.migweb.co.uk/forums/archive/index.php/t-74232

try here, forund it on mig
http://www.migweb.co.uk/forums/archive/index.php/t-38159.html

wel I just need things like whats the main advantages from doing it, whats involved etc just general info for my practical write up thats all

info from? like what info

Im doing this on a nova engine for an assignment in colege and need to do some research for it etc. Does anyone know where i can get the info from, websites etc
cheers
jon:thumbs: