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Originally Posted by gc350
cheers for that mate, i may well go for the 700cc kit, i guess its gonna depend on if there is anything else that needs doing when i start building it up. Just due to the cost. Can i assume that the rest of the standard internals are suitable for going upto 700cc with no mods needed.
I remember us having this discusion before, i knew i should have saved what you'd said, but it all got lost when the site went down some time ago. TBH i think i'll go for the K3 cams + mine, the idea is to get this engine ready as a stand alone item without touching my current one. Also if i'm gonna swap the cams i may aswell put in the ones that make the bigest difference.
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There's no definate answer on the 700cc kit unfortunately... You're definately more likely to snap the crank, you have a fair bit more moving mass and a good bit more power, so it's a lot more stress. But some people have run them for ages without issues. Then, some people put them in, take them to a trackday, blow it up. I decided against it as a personal thing because of the possible risk- it might be low, it might not even exist at all, but it was enough for me not to risk in on my sole mode of transport. So I'll probably do Busa pistons and increase the compression instead.
But a spare engine? Different story- if it pops you can just swap them back. If I rebuild one of my spares I'll do it 700cc I'm sure. And since you think the bores might need work, well, that's another thing in its favour, since it'll probably be the cheap option.
It does mean you're going to blitz that 75bhp though
Lots more midrange from the 700cc kits too.