Datsun#1 Posted July 31, 2015 Share Posted July 31, 2015 Well,im going to be doing a DIY port/polishing job on the maxima head.I will keep everyone updated on my progress.nothing crazy,just port matching the intake manifold,smoothing out the castings,removing the hump around the valve guides and blending into the bowels.A basic stage I port job.I have done this on v8s and one sr20de.this will be my first L series head.I have researched day and night on this.I will not be removing the liners as this will be on a street car... When im done,ill have a shop install new guides and bigger 280z valves as well as a fresh 5 angle cut on the seats. Quote Link to comment Share on other sites More sharing options...
madkaw Posted July 31, 2015 Share Posted July 31, 2015 I'll be watching. Check out FAQ on head building. Back of the exhaust seat is a nasty area. Liners flow well. Unshrouding would be paramount- IMHO. On a stock bore L28 I might even consider notching for more breathing. I'm going to run stock 165 valves first time around with lots of breathing room. Quote Link to comment Share on other sites More sharing options...
Datsun#1 Posted August 1, 2015 Author Share Posted August 1, 2015 Agreed,this head already had the valves unshrouded.combustion chambers were polished too.I learned this after removing all the carbon.the intake runners still have the nasty casting marks and rough edges behind the valve seat.(not sure why PO didnt address this) valves are still stock with a polish.im going to spend some time smoothing out the runners and removing the valve guide humps.then get to work on them bowls. Quote Link to comment Share on other sites More sharing options...
Mack Posted August 13, 2015 Share Posted August 13, 2015 See if you can get some before and after flow numbers with the valves. I'd be interested to see if they make that big of a difference! Quote Link to comment Share on other sites More sharing options...
roger280zx Posted August 15, 2015 Share Posted August 15, 2015 Madkaw, what are 165 valves? Quote Link to comment Share on other sites More sharing options...
madkaw Posted August 17, 2015 Share Posted August 17, 2015 1.65" intakes 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.