*Intake Flow Data w/2.02" at 28" of water

When combined with the right cam in a 350 engine, these heads will produce approx. 400 hp. on pump gas with very little loss of drivability. Read our dyno results below.

We have thoroughly tested the ProComp, (PC) heads, and have added them to our line of high performance cylinder heads. ProComp has realized that the sbc cylinder head market has become very competitive in the past two years. We did at one time carry the ProComp line of sbc heads, and were not satisfied with the flow characteristics, but ProComp was determined to recapture the market, and this they have achieved. The improvements are many. When we first received the new PC heads, they went right to our Super Flo bench, and the results were surprisingly decent. Compared to our Dart heads that we have recently tested, the PC heads were right on their heels, and the PC heads do flow great in the upper lift area on the intake side. Our next step was to dyno the PC heads using a 350 engine, with a good street/strip cam. We also gave consideration to drivability, as most of our customers are into building street rods, and want good drivability. Our target group is the street rod community and the most desirable hp range is around 400+ or may we say that s what it takes to classify your car as a true street rod in our opinion. We mounted the PC heads on a brand new Gen2  350 short block. Compression was to be 9.8:1 The cam of choice was a Howards 488/509 hyd. flat tappet style. Our engine produced 405hp at 5950 rpm and the torque was in the 385-395 pound feet range from 3200rpm to 5400 rpm . What s amazing about these heads and cam combination is the very little loss of drivability. Pump gas is all that is required, and the cam is a hydraulic flat tappet, nothing expensive and very reliable. The intake used was a single plane Hurricane, but the RPM Air Gap or Crosswind are also a good choice, only sacrificing about 15hp off the top end, but will move the torque range down much lower. The Hurricane is our is only recommended on light weight cars or cars with deep final gearing.  

  Most sellers do no testing whatsoever on the Procomp heads. We do more than just flow testing before we market a new style cylinder head. We made over 50 dyno passes as we tested two other brands of aluminum heads. Then our final test is to run it in our company race car at the track. This not only gives us actual numbers but a true feel of how the engine with the new style heads will perform on the street. Our company race car is a Pro Street legal Datsun 240z. Skip has drove the car no less than 1,000 miles on the street to get a true feel of the new combination. It is only then that we feel safe to market the product. One of the main reasons behind much of this testing is to know how our heads will perform when used on a very common setup such as the 350 Chevy engine, with a well mannered street/strip cam, not to mention reliability. This is the type engine that about 70% of our customers have. Cam selection is very important. Our testing on this cam combined with these heads was very extensive. Most of our customers find our info very useful in deciding what combination of parts to use when building an engine.

As mentioned we made at least 50 dyno pulls with the PC heads, and they performed faultless. Cam, carb, and ignition testing is what led to so much testing, but also an opportunity to make sure the new PC heads would not have any reliability issues whatsoever. Our head builder made special note about the excellent style of cutting on the seats in these heads. Our engine builder told us that our line of intake manifolds mounted decently on the heads, and the heads mounted perfectly onto the block. We asked them to make special note on this. All in all, they are very well made heads with good fitment in every area. 

The Howards cam we used in our Stage One 350 engine had just the right amount of lift and duration to bring the PC heads to life, yet maintain streetability. You will need a stall converter in the 2500-2800 range or higher, but you would need this on any 350 engine making 400+hp. We do have all of the many needed items to complete your build in our other listings.

One of the worst mistakes you can make building up an engine is to get a mismatched combination of parts, or cutting too many corners. We know about combinations and how they work. Take a test drive in a car with over 400hp and vs. a 300hp or less and you will then see what you’re missing. The exhaust sound under load is very pleasing. These heads will make the power you need without spending a fortune. We are very pleased with everything about them. We are often asked to compete with others selling at lower prices, yet consideration for the quality of hardware used is not given, not to mention the way others may be setting up the heads could cause serious problems to the heads or the cam. Few if any of the others know much about the correct way to setup a set of cylinder heads.  

 Our new Stage One engines were all built with the Procomp 210 heads and the Howards 488/510 hyd. flat tappet cam. This setup produces 405hp @5950 rpm, and our Stage Three 406 engine produces 515hp with these same heads, using a 565/574 hyd. roller cam. The Stage Three engine setup proved that these heads are capable of making power well beyond what they are doing on our Stage One 350 engine. For those building 350 engines with cams in the 460-470 range we recommend the PC-190cc runner heads. Cams in this size range do not require heads any larger in size. If you do have a small cam in the lower lift range as mentioned, and run the 190cc heads, this will allow for a much better bottom end response. Those running 350 engines with dish pistons will certainly want to run our 58cc combustion chamber heads, as they will bring the compression up to a decent range, and allow the use of a healthy size cam.  

We did one more test worth mentioning. We also sell the Dart Platinum Pro One aluminum heads, so we decided to mount a set of the 200cc Darts on the engine while it had the Howards 488/510 cam in it. It made the best hp between the two but only by 6hp over the PC heads. The dart heads would be a waste of money on the level of street rod we were testing. They may prevail in a much more serious buildup. The Procomp heads are positively the best value by far.

We are puzzled as to why the two different brands of heads ran so close to one another in hp numbers, considering they are very different in flow characteristics. As our company founder explains it, the results of these heads will vary greatly by what type setup you are running. Our test engine is not a good way to determine the true overall value of a cylinder head, but our test engine is representative as to what most street rodders are running. And that s a small block 350 or 383 in the 9.8:1 to 10.8:1 compression range, give or take, being able to run on pump gas, with good street manners, must have a somewhat lopey idle, and most importantly that the engine is not setup in a way that it is short lived or unreliable. While still making around 400+hp, and last but not least, a build up that is not going to cost a fortune. We are sure that the Dart heads would out perform any of the heads we tested in more serious buildup. The PC heads have 210cc runners, and seem to be the best choice for the money without any sacrifice of power worth mentioning when running setups such as mentioned above. The Procomp heads do thrive on a good size street rod cam. The 210cc runners would most likely run very well with cams up to .550 range or more. Even though the PC heads are not flowing on the exhaust side as well as we would like, using the right cam more than compensates for this. We think PC heads are the best value for the money you can possibly find. Our dyno testing has proven that when building up a 350 engine in the 400hp range, the PC heads are up there with the best. We are also certain that the PC-210 heads are a very good choice for the 383 buildups.

You will never see others selling the 210/64cc heads with the cnc d combustion chambers. These were custom built for us only. This was a costly upgrade but we felt it was worth the additional cost. It is our choice of hardware that also makes these heads stand out compared to others. Our testing is also very thorough on our cylinder heads. As far as we know none of our competitors do this. We hope you can value this. We do know for a fact that many dealers are using substandard hardware regardless to what they may say they use, and do not have a true head builder doing the assembly, not to mention the very expensive equipment we have at our shop. Our hardware is superior to what most others offer. Please check out our listing on valve springs, and this will give you an idea of how serious we are when it comes to valve train hardware. Beware of sellers that offer little or no information on the hardware they use. 

Our Stage Three 406 engine results with the PC-210 heads: 8/1/10

 We tested our new Stage Three 406 cid engine with the PC heads a few years ago. We started with one of our Dart SHP blocks bored and stroked to 406 cubic inches, and a hydraulic roller cam in the 564/575 lift range. Compression ratio was approx. 10.6:1 This setup was most certainly demanding of a good set of heads. Our engine made approx 510hp at 6300 rpm, and slightly over 500lb feet of torque at 5000 rpm. This is truly amazing considering the low cost of these heads. We really did not expect the Procomp heads to allow this setup to develop this much horse power and torque. The flow numbers don t really seem to allow for this, but as our company founder said flow numbers are not the complete story. The Procomp heads are on par with most non cnc d heads on the market in the 210cc runner size. Our dyno testing was extensive to say the least. Our next test was for drivability by installing the engine in our company Pro Street 240Z, and much track time was spent at the Bristol Motor Speedway. By the way, our 406 sbc engine had a compression ratio of 10.6:1 and this is a very streetable combination and can use pump gas. You can run much less compression and still make decent top end numbers. Those wondering how these heads performed in a in a 383 will be happy to know that we achieved approximately 440hp with a cam size in the 525 lift range. Rest assured you will never find a set of heads for any price that will do much, if any, better. The most important value in this particular test was that we did establish that the Procomp heads will match up with engine and cam combos that are usually very demanding on the heads flow characteristics. The Procomp heads are perfect for the 383 engine, and will match up well with a broad selection of cams. This testing allows us to more than just test the heads, it allows us to know how a particular cam will perform with the heads. Bottom line is that these heads will perform with very well on a 350, 383 or 406 engine The video clip below is our original sbc 406 engine with the Procomp 210cc heads. This engine ran a full season at the track and was drove on the street for many miles. We did not encounter any problems whatsoever with the PC heads. The car in the video is a 71 Datsun 240Z, and belongs to our company President, Skip White. This car is completely street legal, and was drove to the Bristol motor speedway every week for the entire race season.