Quote:
Originally Posted by TheRealSy90
So after all this P12 nonsense it appears to me that the P11 head is the better one to use for a VVL swap? lol.
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Nope, the P12 head is better. Flows better, has better cooling and if you're keeping the stock cams, the P12 cams are better than the P11 cams (N1s are better than both). P12 will also rev higher since it has lighter valves. I'm just documenting the differences since the P12 swap is less common. Lots of little differences like valve size, gaskets, timing marks, one piece oil pump collar but nothing difficult/expensive to work around, especially now that I've laid it out for everyone with part numbers for the valve seals, valve springs etc.
It's also incorrect to say the P12 is the more expensive swap, like most people think. Let me break it down. This is based on the current eBay price of $750 for whole P11 and $1500 for a whole P12 with 6 speed trans and all accessories.
I am not including parts that both will need in this comparison like the oil pickup, water neck, etc.
P11:
+$750
+$300 for solenoid relocation and lines/fittings
+$300 for hall sensor or P12 CAS
+$450 for N1 cams
-$150 selling the P11 cams (undesirable/hard sell)
Total: $1650 with N1 cams, $1350 with stock cams
P12:
+$1500
+$450 for N1 cams
-$300 selling P12 cams (P11 guys will buy P12 cams, this is what mine sold for)
-$500 selling 6 speed trans (Sentra guys with 5 speeds or autos desire this swap)
Total: $1150 with N1 cams, $1000 with stock cams
There's more you can part out of the P12 and sell to P11 guys like the pistons and stuff, but I think you get the general idea. The P12 already having the right CAS and not needing to relocate the solenoid helps a lot. Plus I don't like the idea of solenoid relocation anyway, a bunch of extra lines to crowd up the bay and potentially leak.