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I was unaware that the ID on heater boxes was different over the years... anyone shed some light on this?? Is this true of the entire tube? I know that some of the outlet replacements will neck them down. For a 2110 Id imagine any of the stock heater boxes are rather restrictive. 60Psi at speed with 10 w40 is good alright, But Id love to know what exaust valve was in those heads... there are ALOT of cheap ones out there, and Ive never heard of a VW exaust valve breaking with a new guide. 2110 would have larger valves so they wouldnt be VW right? Id look at valve quality but I imagine there a whole slew of things that you would need to be careful of at that engine size with heat as you have mentioned. Heat is our enemy. Keith > Actually,My belief is that when I replaced my rotted HE's > with new from CIP,I failed to notice that were two different > HE designs.The one on #3+#4 were of different inside diameters > than the ones on #1+#2.VERY restrictive.Almost 1/4" smaller! > When this was brought to the attention of a support person at > CIP,he said "let me check that".Needless to say,no answer was forthcoming. > Anyway,while it may increase heat on the exhaust valve in > a gently driven stocker,it seems to be deadly to a 2110cc.The > heads were brand spanking new,bigger valves,blah,blah blah. > Heat cares not a whit.If it can't escape it's gotta burn something. > In my case,#3 valve snapped off,danced on the piston until > it got access to the crank and then lodged itself in the upper inside > corner of the case. > > and the guides are still tight. > > > heat could wear the > > guides faster but its usually that the geometry is not properly set or > > that > > they just plain wear out. 20PSI is Low.. > > At idle? > > >. of course it depends on how old > > your engine is but they see about 40 hot at the bearings at 3400 > > I see about 60psi at about that rpm. > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >