Does anyone know anything about these heads?
I'm having a hard time finding info on them.
They are cheap enough...
Jegs says made in the usa;
but ebay listing says:Country of Manufacture:China
In the pictures the combustion chamber looks different from the regular ProMaxx heads
They also flow much better than the "freedom series" 190's

http://www.jegs.com/i/ProMaxx-Perfor...d=#moreDetails

http://www.jegs.com/DynoChart/700/72...9200_graph.jpg

ProMAXX Performance Products 200cc Aluminum Heads for Small Block Chevy.
200cc intake runners / 64cc Chambers / Straight Plugs Bare Heads (check other auctions for assembled)
** THE PRICE YOU SEE IN THE BUY IT NOW IS FOR A PAIR OF BARE UNASSEMBLED HEADS **
"MAXX SERIES" The first out of the NEW Foundry made with true A356 Aluminum. This new design competes with all the big dollar heads out on the market today. We sell a lot of different brands of heads and I have to say that the ProMAXX quality is high, these look like they will change the game in the world of low budget high quality performance cylinder heads.
FLOW NUMBERS:
LIFT .100 .200 .300 .400 .500 .550 .600 .650 .700
Cyl 1 Int 71.1 146.1 205.5 242.1 265.9 274.0 276.5 279.8 280.7
Cyl 1 Ex 54.5 111.0 155.1 179.2 192.9 197.1 199.2 200.1 200.5
28" of vacuum

 

They're what used to be Patriot heads. Supposedly they're cast in China but machined and assembled here in the states.

 

I have their 2151 vortec heads from when they were patriot and they seemed to be decent.

 

If you look close, these seem to be "brand new heads"
NOT the old patriot freedom series,,,These are called MAXX series, hand bowl blending, 5 angle, etc...
look at Jegs
Brand NEW design
http://www.jegs.com/p/ProMaxx-Perfor...44747/10002/-1

 

Reviving this old thread because I am looking at the Promaxx 200 heads and so far the word is good.

 

Get on youtube. There is this guy on there that does headwork. He did a video on them. According to him, dart and brodix better watch out. He said the quality was on par or better than some of the Big name companies. He's listed under "Headbytes". Im looking at them as well.