Which is the best available for my 400ex?

 

I have heard of some fast Sparks 400's, maybe give them a call.

 

powroll does a few stroker kits, we just did a 440 stroker it is the 416 stroked, it seems to be a pretty reasonable kit. it was like 504 plus labor and cylinder bore. the 465 is just a larger bore and maybe a sleeve.

 

You should PM "Bad465" he has the fastest EX I've ever seen

Rod

 

I hear the 465's have a problem blowing head gaskets.

 

There is a simple update to fix the headgasket issue.