#2 done. I guess I'm done too!
https://youtu.be/fCdR7ldlUpA

Hard to tell in a video, but , even though I knocked off 3/4 point worth of static with the EQ heads, the exhaust seems quite a bit louder now , and a little more raspy sounding.

https://www.youtube.com/watch?v=FcH855XCCAk

I like it, sounds Great

WTF, a chiller? Did I miss the memo that you were adding chillers? This should be some interesting results. How hard are you going to drive it?

I was 7% under. Gonna try 6% over.

I got a good deal on them, so gonna try them out.

Next time make sure you clear this with the OSO tribunal.
Carry on...

Haha, all the cool kids are doing it !

That's what I hear!

sounds Friggin Awesome MILD!

Sounds good paisan! How many bodies are in the trunk of that Town Car?

Congrats. I'd imagine they sound a little more snappy. I think we might be heading to the dyno next week.

In the meantime, been working on a 598" refresh and go. Found all kinds of unexpected issues from the original builder but I've addressed them all. There were only 100 or so hours on it. It's a shame... I expect it will make 850 hp when all said and done. Not EQ heads but Big Brodie O 351's.
[ATTACH=CONFIG]554820[/ATTACH][ATTACH=CONFIG]554821[/ATTACH]

Just a quick clarification on some info in this thread. All of the EngineQuest EQ Cast Iron heads are produced and machined in our foundry in Auckland, New Zealand. The aluminum versions of the 320/360 runner BBC heads are produced through RHS/COMPCAMS. I cannot confirm the foundry location however they are pouring some aluminum in Asia.
Thanks for giving us a shot. We appreciate all of the feedback. Good luck with your projects and Happy Boating.

Put $50 on 23 Black for me. Thanks !

Oh, thanks for joining up to say hi.

what exhaust gasket are you guys using on these, I had the round ones from my 088's but they don't like up very good.

I used a 1412 Felpro, because of the round port stellings headers. I did have to remove a little material from the top corners of the gasket. I used a dremel with a sanding wheel, to open the corners up a bit.

Good questions and info ^^^^

Have any of you made sure that the exhaust manifolds or headers does not protrude (block) across any of the exhaust port of the head ?

I didn't notice any issue with the EMI manifolds. I used a Merc exhaust gasket. I really like Mercs graphite gaskets.

Sorry, 570 ft lbs @ 4300 and 540 HP @ 5500.

Thats with a mild cam and thru the stock mag efi intake setup? Stock compression too?

9:1 compression. Stock MPI intake manifold with 3" of runner milled out. Power hit a brick wall at 5300. Only 3 HP difference between 5300-5500. It would make a lot more with a carb instead of the restrictive EFI.

509". 268741 cam

I converted a 454 mag efi with eq320's a couple weeks ago to a dual plane with a small Holley. Customer took the boat out and called while still on the water and said "holy sh!t this thing flies".

On a 532 with Eq 320's at 9.5:1 motor made 650hp @5700 small cam. I bet these heads would go 700 with the right cam on a 540" motor. Spend some money on port work, tunnel ram 2-4's and who knows 750-800???

The 532 made 650/650...

HE should really like the 130hp increase.

Yup, like 60-70hp increase going to carb. Been a few builds up's exactly same (including same heads(RHS,now EQ, identical cam, same 502-509cid and compression) with carburetors. 600-620hp.

EFI too using the Holley EFI intake
http://www.carid.com/images/holley/i...s/9901-203.jpg

Thanks SB. He's happy so I'm happy. It's going to be a completely different boat.

Good info guys.

Black Baja, Im surprised the 454 made any power with a 320cc cylinder head. I was told a 320cc head on a 454 would equal a gutless turd :cool-smiley-011:

Seriosuly though, its nice to see theres another iron head option for us performance boaters out there.

What are you guys paying for the bare castings? PM me if you want.

425 per casting shipped to my door

MT - is your exhaust on yet ?

If not, and I mentioned this before, would be cool (and good) to see how the exhaust ports compare to the exhaust.

I kind of wish more people (including myself at times) would check to see if the exhaust manifold port openings don't protrude over the cyl head port openings. The times I had done this on automobiles, usually proved worthwhile,

Only takes about 15 minutes or so.

I've usually described how to do it, but looking for an article I can link instead, just found this on Stahl's site that explains it.
http://www.stahlheaders.com/ports.htm then scroll to 2nd half of page.

Thats good info.

Ran mine on the dyno yesterday.

468ci
8:1 static
EQ heads
236/245 114 LSA .630/.630 lift cam
Stellings green headers with 1 7/8 primarys and 4" tails
B&M 420 blower with chiller

Ran in full marine trim, made 818HP with 8psi boost.

My last combo, was same shortblock, dart heads, 9:1 static, no chiller, same cams, made 800HP with no accessories, 2.25ID open dyno headers, 7lbs boost. Hard to compare, as major changes made, plus totally different dyno.

I will say, I had to add a chit ton more jetting to get the AFR's to where they were with old combo. Guess the boat will tell the story as far as if I am making more power in the boat.

Ran and made final tuning adjustments with the boat I built the MPI's for yesterday. So far I've seen a 500rpm gain.

No idea what speed but the old setup was spinning 5000. New setup is 5500 with full load of fuel and two guys.

I'm gonna guess mid 70's mph. I was too busy with watching AFR's while monitoring MAP readings and making tuning adjustments to the fuel table to see how fast we were going. But anyway, the 500 rpm gain tells the story of the power the package I built has over stock.

76 MPH on GPS and counting on a conservative tune. 8 mph gain so far. Still testing props.
https://youtu.be/r2QiV9bHmU4

Impressive!
 

That is impressive without a prop change! Nice job.

Thanks! Yeah, that's with box stock 25" Mirage Plus props that were already on it. It's spinning 5400-5500 with a heavy load and calm water so I have the owner trying the next size up and also some 4 blades to see what it does. I imagine it's going to see upper 70's when all said and done.

Eexcellent !

Got a little run time on my new combo. As stated , static compression dropped from 9:1 to 8:1. Replaced Dart heads which were around 319cc runner after CC'ing, with the EQ heads, that I had worked a little. The EQ runners measured about 330cc after CC'ing when done. I added intercoolers to the combo as well. Running 7.5lbs of boost with this combo, old combo was around 6.5-7lbs boost. Typical day with the old combo, 1/2 tank of fuel, some gear on board, boat would run 85-86mph. (best ever with light load perfect chop was 89.9 with old combo). Yesterday, full tanks of fuel, fully loaded cabin with all kinds of stuff she packed for the weekend, we ran 87.5 mph, with a little left.

So, to sum it up so far, I added around 140 lbs in cylinder head weight, 40 lbs worth of intercoolers, 60lbs worth of mufflers on the back, I'd say close to 250lbs of weight on the transom. I can definitely tell she sits a little lower in the water at the stern now. I added pickup for the intercoolers that add a little drag they say, and lost no speed. So far I'm happy with the head swap. I definitely think 8:1 with 7.5psi with intercoolers, is a safer setup than 9:1 with 7psi and no intercooler.

While I never measured intake air temps without the intercooler, this setup stays right around 105-110 when up and running. Today I was getting on plane, and making around 2lbs boost getting it up and laying over. I watched the IAT gauges creep up to 140-145ish , then as soon as it layed over, and water began moving thru the core, temps dropped right back down to 105*.

Good call and I would agree. Glad it worked out for you. I'm sure you had some concerns going into this but gotta be happy with the outcome. Just curious if you were able to leave jetting alone or did you fatten it up a bit?

All said and done tuning, boat ran 96.6 MPH, with 3/4 Tank of fuel, flat water. Back to back runs, so thats not a 1 time speed. Thats with about 1.5-2psi more boost than the old combo. Same props. Boat gained a solid 7+ mph with the engine mods from last winter. This year, she's put away and leaving things alone. Might get the props tweaked, but other than that, I don't think I can get much more out of these 468ci builds. Which kinda sucks, because the boat feels great at mid 90's. I havent talked to many , if any, who have taken a straight bottom 38 Fever to those speeds, and how the handling would be. She's a little light there, but very stable, and no hint of chine walk or anything weird.

Great numbers on a straight bottom 38 Fountain.
Any numbers?$?
As you stated earlier, they are a very nice heads out of the box and don't need much work.

I wanna say, with the porting, milling, valve jobs, springs, valves, flow tests, wash and assembly, i was in the 2500 a set range. I pretty much gave my head guy, free reign to do what he wanted with them.

I did help a couple friends out with specing out a nice spring/hardware/valve setup for these heads, and for two heads, with all parts, it came out to around 1800 a pair. Thats isky springs, ferrea super alloy ex valves, 6000 series intakes, etc.

Impressive numbers on all aspects, cost,hp, real life top speed changes, excellent write up, thanks for sharing.

Who is your head guy? If you wouldn't mind passing on/pm me his contact info that would be appreciated. After reading this i think this is the way I'm going to go.
Thanks again
Matt