the SBC cast had some problems back when they first came out. But all of those issues have been resloved for awhile now. The new castings are made in permanent mold fixtures and they come with a life time warranty against craftsmanship and defects. . We only use the casting it's self. We install new seats, and guides. Out of all the heads we have sold there has only been 2 returns. It was more of a customer issue than the product it's self. just remember you can't believe everything you read on the internet
I have seen some scary shit out of them personally too, from guides, seats and general machine work. The "thing" with these that most people don't like is that they are a cast in China from the last I heard and was told. That puts quite a few people off considering that the US is in such a bad place right now with manufacturing jobs and such going over seas. As far as the heads holding up I have no clue because I know nobody that has run a set.
everybody's bench is different we all know that..........but this type of poot is real touchy with it comes to the raduis entry. Just like a SB2 or big chief.
It seems Shawn is more interested in how they stack up against the other manufactures heads that he has flowed on his bench. All benches are different and that is unfortunate, but when you have data on a few sets of heads it is more of apples to apples then apples to grape fruit. I think that is more of what he is getting at and not trying to bash or discredit you.
I will agree the inlet has a bunch to do with how the head will flow, some heads don't care, others will pick up 20 numbers with a nice opening.
I have seen some scary shit out of them personally too, from guides, seats and general machine work. The "thing" with these that most people don't like is that they are a cast in China from the last I heard and was told. That puts quite a few people off considering that the US is in such a bad place right now with manufacturing jobs and such going over seas. As far as the heads holding up I have no clue because I know nobody that has run a set.
This is why we do our own machine work....for some reason buying a offshore performace cylinder is a horible thing to do as an american....but you can type about it on your chinese computer.........I'm just saying
This is why we do our own machine work....for some reason buying a offshore performace cylinder is a horible thing to do as an american....but you can type about it on your chinese computer.........I'm just saying
This is why we do our own machine work....for some reason buying a offshore performace cylinder is a horible thing to do as an american....but you can type about it on your chinese computer.........I'm just saying
Some things you just can't buy US made anymore, which is mostly the down side from us the consumers saving money and business people trying to make more money.
Cylinder heads is one thing that are made here that there is no shortage of. A Pro Comp is a Chinese head made (cast) no matter any way you try to slice and dice it and thats what I pointed out. There are plenty of other parts that are common parts such as cranks, rods along with other things that are non US made that are common place in this industry. Look at all the valves that everyone uses, Ferrea, REV and Manley, they are not US made they are Argentina, China and I would even bet some are made in India. Computers are another thing along with electronics in general.
I am not trying to shit on your thread at all sorry if you took it that way. I was just replying to a question in general about ProComp heads and why people think the way they do about them.
still have to worry about the casting. Alot of cylinder head castings crack, there is an art to tooling a cylinder head. Some of the best in the business have had head cracking issues.
It seems Shawn is more interested in how they stack up against the other manufactures heads that he has flowed on his bench. All benches are different and that is unfortunate, but when you have data on a few sets of heads it is more of apples to apples then apples to grape fruit. I think that is more of what he is getting at and not trying to bash or discredit you.
I will agree the inlet has a bunch to do with how the head will flow, some heads don't care, others will pick up 20 numbers with a nice opening.
exactly. Numbers really mean little by themselves. Anybody that has flowed more than one head will realize this. It's how they compare to other heads. I have flow alot of different manf's heads over the years. Just wanted to see how these stack up, unless you're afraid of an unbiased opinion.
exactly. Numbers really mean little by themselves. Anybody that has flowed more than one head will realize this. It's how they compare to other heads. I have flow alot of different manf's heads over the years. Just wanted to see how these stack up, unless you're afraid of an unbiased opinion.
I'm not afraid of an unbiased opinion, I've sent alot of our heads out to by independently flow tested. If you read the LS3 head test in HOTROD you would know that our heads made the most power out of the heads with 1.7 rockers ...
If you don't believe our numbers call this guy up and ask him what he thinks of the heads
Anyone using such a casting as the Pro-Comp which is manufactured in China should be prepared for many who will take exception to that fact. Without speaking of the quality, I would say the final price should reflect the low initial cost of the castings themselves. If the cost of the castings is not low, perhaps such a business venture should be re-examined based on the risks at hand.
Looking at the comparison of the LS3 cylinder heads in the Hot Rod article, I am not sure how many folks feel about the price of $2395 (as quoted in the HR article). Generally speaking, anything produced in China can only remain competitive in the market because it is priced significantly below the American counterparts. For the sake of gaining some perspective, where are the GM castings made? Mexico? I for one would not care how thick the decks are or how big the spring pockets of Pro-Comp heads may be if the quality of the material is no better than the recylced Pepsi cans they use in Mexico to make the GM castings. Folks probably should not use that type of gear for an all out build or even a build that flow numbers at 380cfm could support (800hp+ N/A). Maybe that is an overly conservative view point, but, I would think that anyone who is really attempting to go about their build with scrutiny would say, "hey man these things are not up to par and will not last under my proposed conditions." If the build is on a budget, sportsman, bracket or what have you, why not option for the CNC ported GM castings at $1500-1700.
At the end of the day, there are a lot of folks who will see something for $50 cheaper and buy it no matter what. But these folks are not in it for excellence if all they are concerned about it economy. Take my comments for what they are worth; it is a brief analysis of what is happening here and in any manufacturing scenario- in general. Dr. J. you appear to have invested a lot of time and effort into your project here and it shows in your work. I sincerely hope the quality of materials will not compromise your dedication to good machine work.
still have to worry about the casting. Alot of cylinder head castings crack, there is an art to tooling a cylinder head. Some of the best in the business have had head cracking issues.
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