1.2 head on 1.3 block?

[mowgli]

id say stick with your original plan john, would make a more reliable engine, that'l take a good thrashing.

cobblers, my 1400 did 90000miles then got sold to a bloke to put into an astramax...

complete 1300 bottom end
1200 head
1300 cam (means no faffing about with swapping ignition systems and u allready have it at your disposal)

the 1200 & 1300 setups are interchangeable and pretty much identical

slap it all together with a 1300 head gasket and that flash carb u were talkin about, and a 4 branch manifold would complement the whole setup. it'd probably be almost 90 bhp mark when finished.

edit : to seal the deal, a real short ratio final drive in your gearbox, youll have no top end what so ever, but it would accelerate hard !

unless you do some serious head work or the 1300 cam is replaced by a hi lift sport type cam then you will get about 75hp

the 1400 will give about 85-90 on a std 1200 cam & carb and will be reliable

as for the gearbox idea, fine for forest rallying but an absolute pain for any form of road use. you would have to change gear 3 times before 60mph, which is just annoying. the 1400 will pull from 15-115mph in top, I did it.

[John]

If i do it, i'll use a kent ast 1 cam. (270 deg iirc)

[mowgli]

fair enough