I don't know a whole lot about the 1K head and I've been offered a fairly worked one by a workmate. Yet to actually see it so I can't say about whats been done to it. I'm pretty sure they fit onto 5K blocks? If so would there be a gain from this or just a waste of time... or actually kill power?

 

Either way I'll be making some form of meaty K-motor over my holidays coming up, just tossing around some ideas until then.

 

Cheers.

Thanks for that dude, I'll give that a read. :P

Edited July 5, 200521 yr by Josho

Some "K" discussion came up recently, which I added to the FAQ

 

http://www.rollaclub.com/faq/index.php?tit...gine/K_Series/K

 

Personally I would use a 4K head, but thats just me :P

same here I prefer 4K head + 5K block :P

same here I prefer 4K head + 5K block

 

why not just use the 5k head, rather than making life difficult for yourself.

it is a later better design. and the ports are a little larger than a 4k head, not to mention the exhaust ports of a 5k have a smooth port roof. also the exhaust valves have the stems reduced in diameter for better flow.

 

with any other head (apart from 4k dished) you will have to skim the head shitloads to get some sort of decent compression ratio with dished pistons. reducing the deck thickness on a head too much reduces it's stiffness, and makes it more prone to warpage and blowing head gaskets....not to many seem to realise this.

 

the bigport heads have ports which are too large for the valve size. so unless you are going to run bigger valves, better results can be achieved with a later head. also the bigport heads suffer from a pathetic valve stem sealing arrangement. a change to later valves and guides with the clip on stem seals is a wise move, otherwise you could have troubles with excessive oil consumption as a few others who have gone down the bigport route have found.