Whats the deal on these heads??????

[396_WAYS_TO_SPIT]

Something looks fishy here!!! I know some of you guys can find issues on these heads. They flow alot of cfm in the intake but the exhaust flow looks weak to me.....
http://cgi.ebay.com/ebaymotors/BBC-CHEVY-ALUMINUM-CYLINDER-HEADS-PAIR-BARE-320CC_W0QQcmdZViewItemQQcategoryZ33617QQitemZ80298 19760QQrdZ1

[396_WAYS_TO_SPIT]

here are some pics....
http://i16.ebayimg.com/03/i/05/e8/7e/49_1.JPG
http://i16.ebayimg.com/01/i/05/e8/7e/44_1.JPG
http://i21.ebayimg.com/04/i/05/e8/60/4c_1.JPG
http://i24.ebayimg.com/01/i/05/ef/59/83_1.JPG

[FILUCKY]

The exhaust numbers are not bad at all but i would never believe those intake numbers, their are very few heads that can flow 400 or more and for sure not a set of heads that don't even have a name brand on 'em. What are they anyways? 400cfm heads can easily support 1000hp and are not cheap. You are getting into Prostock style heads at 400cfm and up. But this is JMO and i'm sure others will disigree. :argue:

[LakesOnly]

If I had to guess, I'd guess that those are Procomp cylinder heads. Procomp is a company from down under whose parts originate from Australia, New Zealand and China.
Judging by the pictures posted in this thread, I'd say that there is absolutely 100% NO WAY that the heads flow those numbers as delivered. What you are buying for the Ebay $685 is a pair of castings with seats and guides that will need to be taken to the machine shop for complete sizing for all the hardware, a throat cutter taken to the bowls and complete porting. What they will flow after all that is anybody's guess, but they can probably be made into mroe cylinder head than you need on your jet boat, 396. Finishing them will just take more money than you expected.
Again, don't know if that's Procomp stuff, but their stuff does look shiney and new...but you get what you pay for. My customers in Australia RUN from Procomp stuff and instead pay big bucks to buy USA made stuff...they don't even like their own Aussie company product.
LO

[steelcomp]

Lakes pretty much hit the nail on the head...those things are popping up all over the place. You'll spend more to finish them than you'll pay for them. Not a bad deal if you are, or know a good port man. I don't know for sure, but I think they're the old ProTopline head. The molds were bought by someone, I think in Australia, but if they are, the chambers have "issues", and don't work very well. There's no way in God's green earth you'll get 400+cfm out of those, with 320cc's, at .700. I'm not sure you could get that out of those even after porting. I don't think the guys selling these know the difference between a cyl. head and a ham sandwich...poor spelling, (guides need to be "reemed") nonsensical references like giving pushrod reccomendations without cooresponding deck hts, etc. Oh well, at that price, they'll sell a bunch of them. :rolleyes:

[Infomaniac]

I can get import alum heads dirt cheap also.
We pressured them for flow numbers and they did not have any. They finally came up with some but I don't think they are genuine. They only came up with numbers for the specific heads we asked about.
There is ALWAYS some get what you pay for in EVERYTHING.

[steelcomp]

I can get import alum heads dirt cheap also.
You can keep them. :crossx:
Here's a quote from another site, that puts it in a nutshell.
Posted: Sat Jan 14, 2006 9:49 pm
This may not be a "nice" way to say it...
The consumer is stupid and does not really want to be "educated".
We fight a losing battle attempting to explain the necessary work that needs to be done to finish a set of new castings.
All they want is the lowest out the door quote from which ever mail order source that will promise them a "ready to bolt on" set of heads.
If it's in print, it must be exactly what it says...
To be on the side of quality, value added components, you better be prepared to lose a lot of sales to cheaper parts, or waste an unaceptable amount of expensive time preaching quality to deaf ears.
Well said, and oh, so true. This off shore stuff is going to kill us, and it's only going to get worse.

[Oldsquirt]

........ I don't know for sure, but I think they're the old ProTopline head. The molds were bought by someone, I think in Australia, but if they are, the chambers have "issues", and don't work very well. ....
RHS bought Pro Topline.

[Infomaniac]

Yea I havent tried any of those import jobs. I don't build that low quality stuff.
But my junkyard boys (as they call themsleves) jump all over those.
The worst part of offshore parts killing us is they buy our country from us with our own money.

[steelcomp]

RHS bought Pro Topline.I had heard that, and I also heard that they didn't buy the lousy mold, and that someone else got ahold of it. If I'm not mistaken, (especially after seeing the pic of the chamber on this head) that's what this is.

[TIMINATOR]

Comp Cams owns RHS. Heads are cast down under and finished in Tennessee. The heads compare to the Canfields size for size. All of the ones we sold had finished valvejobs and needed only final sizing on the guides(and anyone not checking/sizing guides,especially on a boat application should find another line of work). On our Superflow we found the numbers close to published on the intakes, the exhaust seem to be flowed with a test pipe. My biggest problem is the shape of the exhaust port. We typically D port them and or raise them. We have had no complaints. TIMINATOR

[396_WAYS_TO_SPIT]

Comp Cams owns RHS. Heads are cast down under and finished in Tennessee. The heads compare to the Canfields size for size. All of the ones we sold had finished valvejobs and needed only final sizing on the guides(and anyone not checking/sizing guides,especially on a boat application should find another line of work). On our Superflow we found the numbers close to published on the intakes, the exhaust seem to be flowed with a test pipe. My biggest problem is the shape of the exhaust port. We typically D port them and or raise them. We have had no complaints. TIMINATOR
So you have used these heads tim? The price scares me on these compared to the other heads. I would spend a few more $$$ to get a well known name personally. So when you worked a set how much cheaper was it compared to say a set canfields?
396

[TIMINATOR]

They are comparable,except the Canfield has a slightly better exhaust port, we do not hesitate to use either of them.We have a set of the smallblock 200s here, they are of the same quality. Again, no complaints. TIMINATOR

[FILUCKY]

You honestly get 400cfm out of a 320 intake runner on a non-raised intake port head? :rolleyes:

[Bradf]

The worst part of offshore parts killing us is they buy our country from us with our own money.
I try to buy US as much as possible. Stubborn? Proud? Sometimes Foolish? Hell Yes. I have an incredible pet peeve about my generation (born in 83) buying all these little imports and it being the 'cool' trend. BLEH I say. :220v: :mad:

[Animal Magnatism]

Hey all,
I have a set of the Pro-topline 360's. They seem to work well for me. Though I had to get the guides reamed and seats re-ground. I believe the 400cfm is for the 360cc ports. Could be after cnc porting as well, not sure. Not saying I believe that figure, hell, how many 'shop quoted' flow figures can you believe?
Paul.

[Liberator TJ1984]

Here's the Facts !!!! MY Heads >Out of the box to the Flowbench :cool:
Intake Flow #'s Exhaust #'s
.100>108.30 107.90
.200>176.10 151.70
.300>242.10 188.40
.400>305.70 225.70
.500>354.00 256.20
.600>371.90 277.70
.700>385.30 298.00
.800>394.10 311.80
This was out of the box ,as they were delivered...Engine builder said they were respecable #'s for these style heads and some of the better Quality / Machining he had seen compared to others.....if anyone want them ? pm me with your fax # and I will send the test data sheet :idea:

[FILUCKY]

you running a blower on top of those heads? You must be running the 8 second bracket with that much power. :rollside:

[Liberator TJ1984]

you running a blower on top of those heads? You must be running the 8 second bracket with that much power. :rollside:
Ja ! 8/71 w-2/ 1050's ,std.bore 454 8sec.??? I wish :p
alot of confusion with flow #'s it would seem ???
The peak power of these heads is hit at 8,812rpm !way above where most are running I would think.Test report showed at this rpm on a N/A engine ,slightly over 100hp per cyl.

[FILUCKY]

I just thought i'd pull your leg a little there, i just got a '17 Earl Smith from Gary Snow i'll be running this year, so see ya at the races! :)

[don johnson]

I have 2 blown Teague 572's with the Pro Topline 360 CC heads in my boat. Motors made over 1,100 HP on 11 lbs of boost, pump gas. .630 lift Hydraulic roller. Heads work real good.

[Animal Magnatism]

I have 2 blown Teague 572's with the Pro Topline 360 CC heads in my boat. Motors made over 1,100 HP on 11 lbs of boost, pump gas. .630 lift Hydraulic roller. Heads work real good.
Don, What RPM was that at? Sounds good to me. I'm running the 360's on a 565 / 1071 @ 16lbs boost on race gas. .750 lift cam Should make the 1200hp I want.
Paul

[don johnson]

Don, What RPM was that at? Sounds good to me. I'm running the 360's on a 565 / 1071 @ 16lbs boost on race gas. .750 lift cam Should make the 1200hp I want.
Paul
6,000 RPM. I do have chillers on the motors. You should make better then 1,200 with that cam and boost.

[wsm9808]

The "real" Pro Toplines have 1.750 X 2.400 intake ports and are closer to being "ready to run" out of the box. The knock off Pros(like in pictures by 396) have 1.750 X 2.200 intake ports and are a severe miss-match to a rectangular port intake at the top of the port. They need ALOT of porting to fit anything, but are the same port as the real Pros after you open them up(by all appearances). Also the knock offs guides have to be drilled with a piloted drill and then reamed and the seats cut with a Serdi type cutter. You would have to grind for hours to do the seats without a shaping cut first. And a 4.370 gasket will not work, you have to use a 4.500+ like a Felpro 1047.
Here is a pic of a "knock off being port matched to a 1275 gasket so it will fit an intake without a mismatch. The head is upside down in the picture, the "porting" is being done to the roof of the port.
http://www.***boat.com/image_center/data/503/226IMAGE083.JPG
Pics of (in order) GM 781 oval, Pro knock off, GM 074 and GM 990 heads
http://www.***boat.com/image_center/data/520/226IMAGE075.JPG

[Liberator TJ1984]

That just ain't right :2purples:

[Oldsquirt]

I e-mailed the seller and he finally replied back that the heads are indeed "Pro Comp", just like all the other name brand look-alike stuff he is selling.

[wsm9808]

Those are "Pro Comp" heads that I have in my photos above as well. They(everyone I've seen selling them) advertise them to have 2.400 ports, but they are not. I am going to have mine flowed when I'm finished prepping them and have them ready to assemble.
My theory on this is that when Pro Topline sold out to RHS, the original molds went to RHS and a "modified" set of "new design" molds went to someone else and the Aussie foundry just kept on making them under a new name with the "new designed" ports. Because once you knock out that first inch of port roof you cant tell them from the Pro toplines.
Just my opinion though, I dont know any of this for fact, but if you ever see the two heads side by side you will know what I'm talking about.

[fc-pilot]

As far as the knock off's go I have not had any experience with them, but am happy with the real Pro Toplines. I have the 360's and the numbers are not far off. As far as performance compared to Dart 360's out of the box there is no comparison (from my experience). The Toplines outshined then big time. I bought a set of Dart Pro 1's and spent days fighting the rocker geometry only to find out that they were machined wrong. After calling dart and telling them that the rockers with everything from different valve lengths to every pushrod length imaginable and still having the rollers come off the heads of the valve, they had the gall to tell me that there pro stock engines do the same thing. After hearing that and not getting any help with the problem, I will never buy dart stuff again. Just because someone has a big name it does not mean that there "crap doesn’t stink". OK, I will get off my soap box.
Paul

[GOSFAST]

We have a number of units in the field as of today with the 320 runners, 9.75:1 C.R., Comp Cams retro-hyd. roller, and on the 540 C.I. platform. ALL these units make over 730 HP and 700 Ft.Lbs. Torque. They will "drive" on 89 octane and "race" on 93. We have one unit with the 360 runners out there that made 740 HP with the same C.R. However the Torque was slightly lower at about 650 Ft.Lbs. The flow numbers for this line of heads (the Pro-Toplines) are in line with the posted ones. We see 375 intake CFM @ .700" lift and 275 exhaust CFM at the same lift, directly from the boxes. If some of the posted numbers are being checked on any of the Superflow series of benches this would explain the slightly higher numbers. Dart Machinery recently issued a warning about these benches. But all-in-all the heads do work. Thanks, Gary in N.Y.
P.S. The intake port dimensions on the Pro-Toplines measure 2.500" x 1.750" approximate. The Fel-Pro intake set #1275 is an excellent fit.

[wsm9808]

Hi Gary, I see you made it over here from the Chevelle forums. Welcome to Hot Boat.
Do you remember what the specs are on the hyd rollers your using with the Pro 320 heads in your dyno runs? The 505 engine I'm putting my Pro Comp heads on has a .244/.256 @ .050 with .632 lift.
Scott (kamero68)

[GOSFAST]

Hi Gary, I see you made it over here from the Chevelle forums. Welcome to Hot Boat.
Do you remember what the specs are on the hyd rollers your using with the Pro 320 heads in your dyno runs? The 505 engine I'm putting my Pro Comp heads on has a .244/.256 @ .050 with .632 lift.
Scott (kamero68)
Hi Scott, actually my cousin "sent" me here, I have a blown 540 BB coming up for his boat. Seems he's never happy with going faster every year, and wants to keep trying for some kind of speed record. We just finished a smaller blown unit, a 454, that was clocked out here with radar at just under 106 MPH. Anyway I'll have to get back to you with the cam specs on the 540's, I believe they're around 255/265 x .730"/.730" and 112/114 L/S's. These are, by the way, all hydraulic roller cams. With the solid rollers we're well past 800+ under 10:1 C.R. on pump gas. Thanks, Gary in N.Y.