So I ordered a set of these today. Other than the heads I believe my build has been done several times before so we shall see what it makes. More than likely I will dyno at Brian's when its together.

Talked with Jim V this morning about these heads, the castings look great and after he flowed them outta the box the intake were comparable to dart 320's but the exhaust is smaller and can be ported or machined for whatever your engine setup is. Tell you what at about 1k shipped for these bare seems like a great budget head.... Kinda replaces the Patriot heads since they went out of business.

agreed, the exhaust has plenty of room to grow, we've been doing some testing up here in the snowy north lol, and these Promaxx heads offer a solid base for the buck... the intake side shows to be a bit better than the Dart 320, but the head really comes alive with some bowl work and a massaged valve job,
again... great bang for the buck, and in today's economic times I think we all need a break!!

Thanks Rob... I'm sure you'll be pleased!!

Anyone weight them against a dart or afr casting?

Well there's the QOD... :lolhit:

Kurt, IMPO I think the CNC version of these heads would be too much head for your combination and the goal you strive to meet... as we discussed in various conversations, the 360+ CFM @ .600 lift on intake side is a great fit and will accommodate you at both WOT and when cruising...

Keep your eye on the ball buddy, ya don't wanna overbuild this to the point that you sacrifice the normal operation of the boat!! Unless, of coarse, you changed your mind and decided you're goin after the shootout!! LOL

I will work on a specific setup customized to your application, My version of the Promaxx head will do what you want and then some!! Feel free to call on me if you have questions,
Thank you

So why is that a stupid question? Wtf?

It's not at all a stupid question, I just feel kinda stupid that I never even considered it as a viable thing to check!!

and I'm just trying to maintain a little levity here too!! lol :thankyouthankyou:

I guess I read into it the wrong way the reason I ask is when I had Procomp heads they were much later than the AFR casting and everyone told me that was because of the grade of material, and because of that they could flex and lose the exhaust seats

Sorry bud.. no insult intended, as for the Promaxx castings they're very robust thicker in the deck, substantial seat size and material, as I've stated a great place to start!! and the price is pretty fair IMO

I have inventory.. wanna talk? lol

I already have the most expensive set of afr heads out there lol

I'll try to get the weights tonight. A skid of Darts arrived at the shop this week.

Im really glad to read the info on this thread. I used these same heads. My builder reccomended them. I was skeptical at first but went with it. He told me we need the bare castings and he would build em up. He said he cleaned em up a little (not sure what that was) and then assembeled em. I have very little run time so far but glad to hear others opinnons on them.

Any head person cut one apart yet ?

There are some video on youtube of them being cut apart....... I think they were posted on a different thread

I will put one on the bandsaw just for u sb. Hah. I didn't know there was YouTube videos on this but going by what Valako has said at this point all is good. Actually his comment was they were pretty much like a dart in many ways. He's working on the exhaust ports now and said it's making some huge improvements.

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http://i43.photobucket.com/albums/e3...203_193725.jpg
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http://i43.photobucket.com/albums/e3...203_194420.jpg
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For SB...
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http://i43.photobucket.com/albums/e3...203_195032.jpg

Rookie, can you weigh one of the EQ heads? I know they sure felt heavy lifting them out of the trunk of my car!

If they weigh anything like a Merlin, it will be like a 68 Olds Toronado. :)

I had a 68 olds cutless in my early 20's........Earl Shieb paintjob complete with the sprayed on fake black vinyl roof......

All of the EQ heads have left the building! Headed off to customers to put smiles on their faces! I'll weigh one the next time they are in the shop.

But there are more Pro1's. 2 race boats and 2 poker run boats need some attention.
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http://i43.photobucket.com/albums/e3...128_164146.jpg

Seems castings are good then, my pro comps were like 28 I think

Hahahahah earl sheib 19.99. Paint jobs!

Thank you FF... I was gonna say they feel about the same as a Dart but, I won't comment unless I can back it up..and you did...

question for getrdunn,what will the total cost be when your promaxx heads are in your hands and ready to bolt on?and what exactly has jim v done to them.reason i am asking is i might want to try them on the 509 build i am doing.allen,ak racing,can you answer the same question.

I sent you a text Mike

Kinda curious about that myself. Lol.... I do know currently Jim v. Is at or near 340 cc on the intakes but the floors aren't welded up yet. I could have Jim skip the floors but there's a lot of power to be made there. Honestly I would expect to be up near a cnc'd head with all the good guy parts when said and done but again the time going into these is well above the normal port job and clean up work.

Jim mentioned the time invested would be no different than any other after market heads. So in s nutshell if I woulda went with dart or afr the bottom line is the job would be the different by the cost of the initial non cnc'd head but I know exactly what will be bolting on and not have to check anything. I would imagine one would save a lot with minimal port and clean up work and assembled with the right parts.

The only issue I see is if you ever sell someone may want a name brand head, personally if they are good they are good, who cares the name...

I can say one thing for sure, they are good, as my name only goes on a good product and jointly, Promaxx is represented as their name is riding on it as well...

In no way will I belittle their product by excluding their efforts in developing a sold platform from which we customised it to meet our specific needs...

Is Promaxx anyway tied into what used to be Patriot Heads?? And what ever happened to Patriot they used to be a good head as well at a good cast that was cast in china

Patriot went out of business likely due to poor financial management as well as other issues... New owners bought the facility and redesigned the head creating what is now Promaxx... so "tied to" I suppose one could loosely make that reference, however one company really has nothing to do with the other...

Hope that helps...

Answers my question 100% thanks.

The AK Racing/Promaxx version is a reworked Promaxx 317 targeted to meet the needs of the marine high performance industry

AK Racing/Promaxx head
 

The AK Racing/Promaxx marine head:
[ATTACH=CONFIG]564538[/ATTACH][ATTACH=CONFIG]564539[/ATTACH][ATTACH=CONFIG]564540[/ATTACH][ATTACH=CONFIG]564541[/ATTACH]
Fully blended intake bowls from the seat through to the transition
Reconstructed venturi intake and exhaust
Marine valve job with wider seats for better cooling of valves
2.250 or 2.300 Severe Duty intake values
1.900 Inconel exhaust valves with fully polished ports for optimal flow...
High quality endurance valvetrain...
Each head is assembled to the end users' application and then vacuum checked to ensure proper valve seal...

Sounds like a win win situation! Good product at a tad less cost.

Also available in CNC versions 340 and 370... they flow big numbers for a 23/4* head