Ok, like the title says I'm looking for the diameter of the valve faces on the 4.6 liter Northstar heads. Also does anyone know the specs or where I can find the specs on the N* cams (lift and duration)? If some one has a pair of heads laying around could you get a measurement of the widest point on the valves as installed (outside of one intake to outside of one exhaust at a diagonal). Trying to see if I can install N* heads on the smaller bore Aurora 4.0.
It's challenging to get an accurate measurment on the diagonal across the valves due to the shrouding, but it's pretty close to 3.36 . if this puts you in the ballpark, get back to me and I'll try for a more accurate measurment when the sun is up .
Russ544
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10:22 PM
HTXtremes Member
Posts: 345 From: Mansfield, AR Registered: Sep 2007
That does help Russ, The bore of the Aurora is 3.425", I was looking at going .060" over for more clearance, that would leave me with 1/16" of an inch on each side. If the valve are angled in much it would provide even more clearance when the valves opened.
Were you able to get the diameters of the valves, Russ?
Thank you both for your time and measurements, this helps out alot!
I'm going to use twin T3 turbos for now, upgrade to ball bearing turbos later. The ECM will be the 7730.
Thank you for the compliments, and for your help!
I'm thinking of having the 4.0 machined for the 4.6 valves the porting and polishing! Desktop Dyno 2000 is saying around 553 peak HP at 8k rpm and 427 ftlbs torque at 5500.
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