Thanks for the video Eric. I have sold quite a few sets of these heads along with many other offerings from ProMaxx. Great service and have customers with 20+ thousand miles on them, with no issues what so ever. These heads make very respectable horsepower. They are a good option.

Great video Eric. Thanks for sharing this information. Lots of my customers are buying these heads and have had really good success with them. Thanks to the guy that sent them in for the video.

Very good head, stock. I'm still an AFR man though. I've ran several different brands, in a lot of different applications. Overall, I have always gotten more bang for the buck with AFR heads. Always top quality.

Thank you Eric, I have been waiting for you to do a review on these heads. And thank you for all your knowledge sharing. Very much appreciate in helping pending money on the right head for a certain build. Especially with the higher prices of today. Thanks again, Nick at NAR Performance Racing

I used a set of the 200cc maxx series Promaxx heads on a 383 for a street rod (67 chevelle) with out even trying to get maximum HP it dynoed at 491 Ft/lbs at 3900rpm 499Hp at 6600 rpm with a small roller 242/606, 10:1 compression. pump gas. I ordered them bare with valves and put LS B hive springs on. They were considerably less expensive than AFR. My customer is very happy with the out come. I am sold on them and the people are pleasant to work with.

I remember when jegs started carrying those heads, they were dirt cheap. I use to drool over jegs and summit catalogs.

I had called Promaxx about a month ago and asked who's valves they are using. They said they use to buy them straight from Ferrea but they had a cost issue so now they buy there valves from some place in Argentina. I also asked about Valve springs and they told me they were Pac springs.

Awesome service you offering Eric, way to go. Everyone will be buying promaxx and trying to port them for even better flow after viewing this.

Good video thanks Eric. Interesting observations and flow numbers. It would be interesting to see how they would react to some serious port work. I realise that you probably don't have the time, and you would have to get the head for free to justify doing it, but something like your internet porting video series on one of these heads would be something that I would find quite interesting. I wonder how many other people feel the same. Regards Greg

I've said on one of your other vids, my son baught a set of their "Maxx 200cc" heads, I don't know if that's what those are or if the "Maxx" series has a little cnc work done or??? But anyways straight out of the box on his 11.1 ,383ci pump gas engine, it flat out rips!!! Been on his engine gotta be 3yrs now, no problems whatsoever! So myself am sold on them thing's, if you're going to buy a china cast head, them are no doubt the way to go! And you can save about 800 bucks compared to an AFR!!! So why not? Especially after seeing this and seeing how they perform on my son's car! I run Pro-filers myself, but building a stronger engine and will be buying a set of their 225's!

Begs the questions: I have been told as I have been out of the game for 25 years (military), that many of the "cheap" heads have crappy valves and very thin guides. I get there is some truth to that. For example the Edelbrock e street heads, budget friendly USA built heads, advertise max .550 lift but have a reported issue above .500. I feel that they most sell a butt ton more heads then the negative responses would leave you to believe, and I would assume the majority of issues are user errors. Promaxx (changed names a few times) has the same reputation, but they have been around so long now the heads have to be "okay" at least?

I have a set of promax heads and love them

Thanks for the video! Love seeing these comparisons.

i run PW heads and they also outflow brodix. it is an exact copy of ik 200. only difference that i can see is the PW has a 67 cc chamber. casting is ultra smooth. they use Brodix valves, Howards dual springs, Manley valve retainers, Comp valve locks, brodix valves seals, Pep locaters. ARP studs, Brodix guide plates so im very happy. good quality parts I have the 204 cc and getting 77% of flow on exhaust.. At 600 they flow 273.9 on intake and 211.2 on exhaust. this is the 3rd set i have installed and always the same consistant quality. love your videos

Really would love to see the Cleveland heads they make flowed, the claimed flow is pretty good, seems like it would make a great 351 or 351m/400 head for fairly cheap.

My car ran pretty darn good with these heads. I made probably 4 to 500 passes on them. 50 or so on nitrous never a issue. Motor is in a grudge car now and I know it will run dam good... my opinion

Thanks for this video. I got a set of their 183 heads and later saw a video where you shared Promaxx was a copy of the IL head. I feel it’s safe to assume the smaller 183 would be just as proportionally better in flow than it’s Brodix original? Promaxx’s advertised numbers for that 200 head are really close to what you found.

Hey Eric. that last video you did about the different stock LS heads. well I got a Holden 5l head flowed a stock iron one and it was interesting because it flowed 240cfm on the intake and 180 on the exhaust but hit 165 by .300 and flat lined that was with a 2.020 intake and a 1.600 exhaust. it's interesting because it flows very similar to the LS heads from the 4.8l and 5.3l. I think the Holden 5l EFI head was GM's first ever spread port head. If they weren't iron I would send them over for you to have a play with. TK or Tony Knight here in Australia does some good porting with them. TK did a set of the old carby heads which are basically a Pontiac or Olds head from memory and got a 308ci engine to 620hp on the engine dyno with iron heads.

Look at David Visard porting videos and you can fix a poor flowing head he says to use the 194 intake valve to unshroud the port it works and it's worth big flow numbers ive done what visard teaches and it works fantastic

PLEASE review the Promaxx cnc 225 Shocker heads! Promaxx claims they flow 325

love the channel, great info, i run a set of all pro heads on a 410ci sbc, would love to see you test a set of them

Man that’s the problem with American made products we have worker’s that care less about quality in the product’s and people from china are taught to do good work for a whole lot less money truth to be known it’s probably some rich Americans who actually are the real owners of the companies just something to think about great information man

Been doing a lot of comparisons between SBC aluminum heads for my 406 and I'm seriously considering the 225s. Just haven't decided if I'm going to buy the regular or CNC.

Have you ever flowed any pre eliminator 220 AFR SBC Heads ? I have a set standard 2.08-1.6 valves that flowed 263/203 @ .400”. 320/225 @ .600”. And max flow at 333/231 at .900” with a 4 angle valve job and no extension on exhaust Flowed on a 4.155 bore. Curious if that is a respectable head for what it is. Thanks.

Have a brand new set of these that came with my stock 1969 350 nova . Could I run these with stock pistons and cam ?

I own a set of these. I haven't ran them yet but I'm hope for the best.

Another great video Eric. On the topic of off-brand SBC heads. Have you ever flowed Speedway P/N: PCE281-1198? I think they are made in Australia. I was just wondering if you knew who they were patterned after and how they flowed.

Exactly the head that's on my 383 right now! Not to mention been hoping one would make it's way on to your flow bench for some real life numbers. Thanx for the info! Any sort of improvement work to follow??

im a fan of BRODIX but seeing all the variables and cost of Bang for Buck.. I may try these on my 383 build. However, whats the claim to fame on the SKIP WHITE 200cc heads???

thx Eric, did you look at port cross section / volumes? I am thinking in the line of port energy for road racing application

Nice! I'm waiting for my order of these to get delivered for my 383. I went back and forth over getting these vs the brodix and it came down to availability since like you noted, the cost difference isn't that much. From other youtubers the aluminum used in these castings is very comparable to the US cast heads.

Were the inside locators a nice fit to the size of the springs? My small block Mopar promaxx heads also had inside diameter locators, but they were pretty sloppy - meaning inside locator was quite a bit smaller then the inside diameter of the spring so there was lots of movement.

Hey Eric Great video as always are those the maxx series or the project x Greetings from Denmark

Thanks Eric for a great video, I wish you was closer to me, I’m in progress of building a sbc for my 86 C10, I’m building per 1990 mercuiser specs (cause of the 144 going on it), it’s more for show than race, it’s been 25yrs since I built the last one 😀 all these upgrades in todays world from then is something else.. Thanks for sharing this with us 👍

Can you do a teir list of SBC heads? Worst to best.

What after market aluminum heads would you suggest for a 1980's 305 SBC 5.0 engine 🤔

QUESTION please. How does the MBE 10 degree wedge head. Stack up against the promaxx?

Are the PRC heads any good.

Subscribed ! ❤

Hi see peeps on here claiming 300 at 600 on these heads...I think these are the same heads that lots of people sell ..from chia...i have never been able to get over 275 out of them...what am i doing wrong!!

What type of power do you think they would make on a typical flat top 11.1 383?

Have you ever tested the power products BBC heads

This video is really good

Great video

Use. a sharpie or something to mark papers and heads, hard to tell whats what on video. Thank you for making the video though.

I was listening to a podcast the other day, an episode of Hidden Horsepower. One thing that stood out was that it seems, flow numbers aren’t everything and velocity has more importance when it comes to HP Eric, What’s your thoughts? Thanks Tom

Eric, are you sure these heads are 100% finished by Promax? They look like they have been touched up by someone since they are already used. I own a pair of these but my throats is not as well finished as your sample. I also have a 90 degree step into the first bowl cut like the Brodix

With the exhaust working under pressure, would the weaker numbers of the promaxx really hurt much power?

@Eric Weingartner what do you think of the 225cc promaxx heads ? could they be made to flow close to a afr 220 or 227 since these 200 flow like a afr ? if i got them bare and used good parts inside them?

Would love to see you do the new x factor heads I have the 215s on my engine if I wasn't on a time crunch I would have tried to send them to you

Is the VJ and bowl blend done in US on the Promaxx? I heard somewhere it was? These elements are what explains the good performance.

What would the horse power difference be between the promaxx and the IK200 on a 355 with 10 to 1 compression and a 292 magnum camshaft

Another great video Eric! I know promaxx supposedly does all the machine work here, & the heads are supposed to be made of decent material! But what I’ve seen a few times, is guys buying a complete heads with all the parts in them, then run into major issues when they drop a valve & destroy a new engine! (Valve seats were falling out on this one,) Or where a shortblock we built wouldn’t run to 4000rpm! Well the valves were the shittiest I’ve ever seen, & the so called solid roller spring setup on it had about 67lbs on the seat 🙄🙄🙄🙄! Most of the good stuff is set up by distance to bind these days! Luckily he didn’t drop a valve also! So by the time theses guys spent all the down time & money 💰 making them as best as they could be, they were both now behind thousands of dollars 🙄🙄🙄🙄! Things might be much better now???? IDK 🤷‍♂️! But if they are now putting decent parts & doing decent machine work, my question is, why are they so expensive??? Because I’ve heard of engine shops buying pallets of china heads for 100$ per casting 🙄🙄🙄🙄! You know the sellers of the castings are making money! So why do they normally come within a few hundred dollars of the good American 🇺🇸 made castings & parts! If it’s a engine we build, it only goes out with American made parts! Sometimes we have to use the scat rotating assembly’s because of cost! (Not our choice, because it’s usually some morons price shopping!) But 99% of the guys already know the deal & don’t want to send there hard earned cash 💰 to our enemies! Now sometimes parts are brought in, overseas castings & rotating assembly’s, rotating assembly’s are usually not a issue, but if there complete heads, we will not install them without going thru them! From what I’ve seen, the parts in the heads usually get replaced with good stuff! I don’t do the heads, that’s the boss & the cylinder head guy! I also know we did 2 identical BBCs probably 5 or 6 years ago, with the main difference of head castings, one AFR & one overseas castings! Same intakes same carbs, cars that weigh the same, Bla Bla Bla! The car with the AFR heads is almost 2 tenths & a few mph better! Once they spray them, there just about the same! I think 🧐 the slower one has more pill in it 🙄🙄🙄🙄! Sorry for the story! Keep them coming! 👍🏻👍🏻👍🏻👍🏻🇺🇸🇺🇸🇺🇸🇺🇸

Does Brodix, Darin Morgan, and AFR pay attention to these videos? Seems as though they better, lol.

Good video

Crazy these outflow the Brodix iron killers even with the Cnc chambers. Do these have the undercut stems? Just wondering where the extra flow is coming from?

Have u ever flowed the dart shp 200cc head

Cant anderstand The Kina heads are kopia way dou The flow better????

Any experience with the promaxx ls3 small bore head?

we're famous cylinder head block factory in China 🙂

Mine where junk right out of the box. Quality control is awful. The China castings are great but the machine work done on them here in the US is awful!! They seats where way over ground and had to be replaced. If I had to do it over DART all the way!

How does Promaxx get away with copying the Brodix? Do they license the design?

😢

😁

Great video