Quote:

Find some 790 cams (I have a set, make me an offer) and maybe port and install 1mm and 2mm over valves.


This is what I'm thinking since he already has an 865. I looked over the specs on the 904 kit and although it did say it increased the ratio to 10.5:1 it didn't increase the stroke and only increased the bore 2mm. Something isn't quite right about that math considering the increase in swept volume is only 20cc per jug. On the other hand, that kit in a 790 would be awesome, especially with valve and head work to match. It seems the more reasonable claim that an increase from 395cc to 452cc per cylinder would bring the compression ration to 10.5:1. I'm thinking from 432.7cc to 452cc (865-904) is more like an increase of 9.8:1, maybe 10.0:1 and doesn't achieve the 10.5:1 as advertised.

Last edited by oldroadie; 07/23/2007 3:02 PM.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)