How come you didn't let them do a complete finish on them Most places you shouldn't have to get heads back and do more work to them after you than paid for money for them
Thanks for the reply! I paid for the CNC Service Only, $875. The next stage that they offer is the stage 1, $1300. They clean up the heads and have them ready. If I can do all the work, I'll save money.
So the CNC job they offer is essentially just a starting point for people like you and me. This is what I understand. The obvious advantages of using a CNC job is that it is more precise than what…let’s say….I could do who has no experience with porting heads. I have the tools I am a toyota master tech by trade who has also worked on a little bit of everything brand wise. I’ve been doing a lot of research into porting because I want to do it to my Gen 2 coyote heads while the engine is apart. That’s just my understanding correct me if I’m wrong please. My questions are: Why not port them your self? Like I said I’ve never ported heads before and the reason I’m asking is because I’m afraid to mess up the head and these heads are NOT cheap at all. I want to see your reasoning and make my own decision. Do these heads need porting? I’m going for a high performance N/A build. Not sure what you are doing with your build. Did you need to get bigger valves? Did this decrease the compression--need a taller piston to compensate the loss of said compression? (If any was lost) I’d appreciate your input/help I do a lot of work to cars everyday but I’ve never built an engine before.
If you never ported heads before (by hand) I wouldn't learn on your Coyote heads. Find some junk heads in the junk yard for cheap and practice. There's some good videos on RU-vid to learn from. The CNC port is the best from what they learned and the machine does all the work. For 900 bucks that's a good deal. All you have to do is clean up some rough areas and reassemble your heads. Porting any heads will benefit flow and free up HP. More so for a FI engine. I didn't get bigger valves, I got stock size Ferrea valves. Not 100% on any changes on compression from the valves, but CNC porting the combustion side of the head dropped it a little, but not much. I'll be at 12:1 compression on my engine.
If you already have gen 2 heads, you're off to a great start. If all your chasing is NA horsepower look at what the gt3/gt4 guys have done. There are a plethora of threads about hybrids with gt350 heads, fpc vs cpc (crank variants), and more! Your valves are already bigger than a gen 1 head, and flow quite well. Porting is not necessary depending on end goal. On a stock head, cai and headers we usually see 430+ at the wheels on pump and approaching 450 on ethanol. Increasing valve size does not change compression, you are still limited by volume of the cylinder. That said Headworks has a few data points showing that updating to ferrea valvetrain over oem yields a small yet noticeable gain in flow. So, you would need to decide if that valve has become your biggest restriction. If it were me, Id bump up compression since it sounds like you already have it apart if not, switch to a better fuel to remove the octane limitation you have even in stock form with pump 93, switch to an 2018+ manifold with an intake, long tubes and go from there. Compression can easily be bumped up to 12.5:1 with ford racing parts, for example they offer that in the Aluminator XS package (to which you can also source just a bottom end or do like me and just use the info to copy with your own choice of parts). This can save some cost in chasing displacement with boring as you can see how they went to a 5.2L but kept a cpc with oem spray transfer still used and a nice new gen 3 block. gen 2 blocks are just fine! You could lock out vvt and go with an aggresive cam to chase hp numbers but honestly its hard to touch what the gen 2 cams and factory vvt offer for a starting point. I'd only ditch vvt if it was a necessity due to engine control, you have plenty of seat pressure for factory rpm and gen 2 heads already come with the updated boss valve springs. Its a bit to chew on but I rambled since there wasn't a clear decisive target to hit and instead just spewed about some coyote power points. Feel free to pick my brain, its not omnipotent but I stare at these things every day and they pay me for it... so ... I can atleast offer what we have run into and you can use the info to make your own informed decision. :)
1)- 😮Seats in the heads to send or remove before shipping? 2)- Do they offer blending of new seats after the are cut and the areas they would do if installing... ? Awesome letting the masses know!!! KUDO'S for a nice vid...! Respectfully, Seth
