The CSX: April 6, 2008

by on Apr.06, 2008, under CSX

Well it’s been about a year and a half since I drove the car.  This weekend I finally got a chance to tear into it.  I pulled the head and tore it completely down.  This crappy reman head is pretty screwed-up.  The three rear coolant jackets have been ground out and rewelded at some point.  There is a small crack between one of the forward jackets and the chamber.  The cam journals are pretty chewed-up too, so I think this head is done.  Too bad too because it has tight guides and fairly new valves.  The plan is to use the original head that came off this car when I got it back in 1998, which appears to have been junkyard TBI roller cam head as the exhaust valves are pretty burnt up.  It also has some small cracks starting in the rear jackets, but they are not threatening yet and can be relieved.  The guides are worn as well and so it needs a complete rebuild….

I also pulled the trans in preparation for the new TU ceramic/organic clutch that’s been sitting on a shelf waiting for a chance to be installed.  I also checked the input shaft and diff carrier play and they seem to be holding up well.  I had a little trouble removing the passenger side axle due to the OBX’s tendency to collapse slightly when the bearings are installed.  A bit of tapping persuaded it out.

Back to the head…a month or so ago I decided to use this head as my first attempt at head porting.  I figured it was no big loss if I ruined it and was still usable if I didn’t.  It turned out much better than I thought it would.  I made a few mistakes, but it should still flow much better than stock so I figure why not try to run it and see how it does.

Intake, before and after (click for higher resolution):

Exhaust, before and after (click for higher resolution):

The bowls were cleaned up and the ports straightened and blended.  The roof of the intake was raised considerably (too much over near the bowls) and the roof of the exhaust was also raised slightly (there is a coolant passage that needs to be watched out for).  I also filled the area on one side of the intake ports where core drift always leaves a pocket the undercuts the seat with JB Weld.  This is probably where Steve Menegon does it, but I didn’t look that closely at his head on the Daytona before installing it.  The floors were smoothed and blended, but otherwise left alone.  I did lay back the floor at the exhaust bowl more on the advice from Tyler.  I’m now coming up with a way to de-shroud the valves so that it is done equally.

No comments for this entry yet...

Leave a Reply


Use the form below to search the site:

Still not finding what you're looking for? Drop a comment on a post or contact me.

Sites that interest me

A few highly recommended friends...