J-ROD Posted July 13, 2015 Report Share Posted July 13, 2015 looking to put bigger oversized valves into my 7k-c having some trouble finding what after market ones will fit have heard maybe A15 valves fit ?(but aren't that much bigger) if anyone knows or has done this please comment would be a big help (or any other 7k-c info) cheers J-rod Quote Link to comment Share on other sites More sharing options...
styler Posted July 13, 2015 Report Share Posted July 13, 2015 Hmmm from a quick search seems the 7k are 36mm Inlet and 29mm Exhaust like most k series? I would say the head on the 7k is a huge restriction from a performance aspect and it seems you can't do too much about it, it looks like its built for steady torque being undersquare 80.5 x 87.5mm Anyway try here for some Datsun valve sizes http://datsun1200.com/modules/mediawiki/index.php?title=A-series_Cylinder_Heads http://datsun1200.com/modules/mediawiki/index.php?title=L-series_Engine_Components Quote Link to comment Share on other sites More sharing options...
styler Posted July 13, 2015 Report Share Posted July 13, 2015 (edited) Just from experience, significantly bigger valves need bigger seats, deshrouding and port work to work well, its all about flow, slapping in slightly bigger valves on recut seats and hoping for a magical performance increase just won't happen. Not with a 7k anyway. After a quick look at the 7k it really is not a performance motor, its a work horse. Proceed with caution, modifications may upset the horse. Edited July 13, 2015 by styler Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.