Seems there's a flavor of the month with cheap eBay aluminum heads, so I did some digging.  First, I'm skeptical when a company's website has no details on their "about us" link.  Second, it seems this is the latest company in a line that started with ProComp followed by Sydney Speed.  The company is based out of Australia from what I've read, but is a shill for a Chinese company.  These seem nothing more than rebranded ProComp heads, and the list of failures on those is long. 

Personally I won't buy offshore junk just because its cheap.  If I were buying an engine I'd rather have a set of reworked OEM iron heads than aftermarket ones likely to drop a valve, have the springs go soft, etc., etc. (all failures I've read about multiple times with ProComp heads).

I've watched a couple Youtube videos where they did head shootouts and included the cheap ones, and they were often worse than a stock head, except at max power.  This tells me the ports are just hogged out stock ports that increase peak flow, but lose all the low lift benefit of a careful design like the E7TE or GT40s.  That low cost seems to come in part from not doing any real flow bench testing or R&D.

In this search I came by a quote from the late, great John Lingenfelter: you can bolt crappy heads on an engine with a great cam and make crappy power, or you can bolt great heads on an engine with a crappy cam and make great power.  Chevy guy or not he knew exactly what he was talking about.  I remember those tests where AFR got 80HP on an otherwise stock 5.0 with just their heads. 
 

I just finished watching an Engine Masters episode where they compare a few intake manifolds on a 351w. The last one they tried was a Parker Funnel Web which used to be a good intake, however now that Speed Master makes it the performance was terrible compared to the others. Casting was terrible among other things.

Go ahead and buy em Steve...xi Jinping needs to take his wife out to dinner.

Bolted to Floor wrote:

I’m a firm believer in the “if it’s too good to be true, it probably is”saying. That price seems really cheap for a complete set of heads. They have a 30 return policy. Is it worth buying a set and then having the machinist that just reworked your iron heads take them apart and look at them? From the one pic they have, I can’t tell if there are helicoils for the rocker arms and exhaust bolts.

I was just asking for opinions or any real world data.  I’m not buying that crap!
What about buying bare castings and pieces from alex’s parts then have your machinist put them together?

Made in China, I’d pass.
I was looking to trade my 2019 Nautilus for a 2024, as soon as I found out they are no longer made in NA but come from rice paddy land I said stuff it!