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Message: <blockquote data-quote="r3dn3ck" data-source="post: 274683" data-attributes="member: 9214">Probe don't have any coating and you have to buy the rings. Mahle are phosphate coated and come with rings as part of the piston package. The only reason I got the probes was the Mahle's were backordered for like 6 months at the time for the .020 over sets. If I'd wanted .010 over or std bore or .030 over it would have been no problem but I wanted .020 so I said screw it and went with the probe slugs.For valves, stock size is fine but IIRC 1.84" is the next size up on the intake side and 1.45" on the exhaust side. Here's an experimental cam grind you can consider. It's specific to 5.4's so DO NOT USE ON A 4.6! 236/250 .510/.550 on 111.5. The low end will suffer a tad but there's still plenty there. The mid-range and top end gain fat under the curve. You'll want that on one of Comp's XE lobes so you get a really fat ramp rate. You'll also need hotter springs than stock. That grind should go completely nuckin futs with a set of longtubes.</blockquote>