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SBC cc Hand Blended 2. Valve Springs, Gold Series, Dual, 1.

promaxx heads

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ProMaxx, Maxx Series Chev SB Aluminum Heads, 200cc/64cc, Straight Plug, Assembled

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International delivery. United States delivery. X Welcome International Customers!Help Desk. Shop All. My Account Access My Garage. View All. ProMaxx Performance. Hide Info. Acting as one of the largest suppliers of ported cylinder heads, ProMaxx also offers a complete line of replacement diesel cylinder heads.

With replacement heads for the Ford 6. With over 30 years of racing experience, at nearly every level bracket; pro Mod and Prostock, ProMaxx has learned what works and what does not on the street and the strip. They have designed a complete new line of performance heads that meet or exceed the big names in the industry.

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promaxx heads

Manufacturer's Part Number: Part Type: Cylinder Heads. Combustion Chamber Volume cc : Intake Runner Volume cc : cc. Cylinder Head Style: Assembled. Cylinder Head Material: Aluminum. Intake Port Shape: Rectangular.

Intake Valve Diameter in : 2. Cylinder Head Finish: Natural. Intake Port Location: Standard. Exhaust Port Shape: Square. Exhaust Port Location: Standard. Spark Plug Style: Angle. Intake Valves Included: Yes.We tested power curves of several key cylinder heads and recorded the results. We then flow-tested each set, bolted them to the same engine with the same camshaft, and dyno-tested the combinations for horsepower, torque, and power curve.

Meeting our requirements were five sets of iron and three sets of aluminum heads. Rather than banning them, we took the opportunitiy to see how well they would perform under our scrutiny. Why not? After all, it is very represen-tative of a typical performance engine found in most Chevys today.

In the end, we not only gained tons of data, but also found that all the cylinder heads we tested demonstrated power curves to match a variety of performance levels at different costs. For days we beat the heck out of this small-block. Eight paris of heads in three days.

That means the cylinder heads and intake manifold on and off 16 times, head-bolt torques, and valve adjustments. To illustrate the difference between the heads, we placed them into three categories based on published intake-port size. Each category is matched to the engine's size and performance level. As an example, a moderately built should perform well with cylinder heads from category I, whereas category III heads would be too large and should be selected for hot performance engines typically larger than ci.

While greater port size does not guarantee increased airflow, properly matched port size and design promotes increased airflow without sacrificing velocity. This equals improved torque.

On the following pages you'll see the specs for each head, including the true measured chamber and port volumes as testedvalve size, weight of each head, and cost. Below that you'll find each cylinder head's airflow chart at a range of valve lifts. We've listed the torque and horsepower numbers for every rpm up to 6, and figured out the averages. When surveying these test results, keep in mind the performance category you're trying to target. Your engine size, compression, camshaft selection, stall speed, and rearend gears each play a vital part in maximizing performance.

Like all engine modifications, the cylinder heads you install, when matched to your engine's specifications, will help provide huge gains in power levels. It should be noted that this netted a lower compression ratio. With these heads you can gain power and save money.

At 3, rpm these heads produced lb-ft peak torque and peak horsepower at 5, rpm, making them a great choice for many mild-to-medium street-performance engines. To allow the use of a 0. These heads produced an average torque number of lb-ft, a large portion of it near the lower rpm band. Peak horsepower for this head ran in atwith an average of at all measured points from 3, to 6, rpm. These heads make a great choice for a budget-built street car where good torque is needed.

The use of these heads requires a special Vortec intake manifold and recommended head bolt kit. They unleashed lb-ft of torque from the small-block at 3, rpm and horses at 5, rpm. This head incor-porated a larger 72cc cumbustion chamber, which produced lower compression on our test engine than the smaller 64cc chambers featured on many of the other heads.

These heads produced good mid-range power. With its cc intake ports and cfm flow numbers at 0. Matched to a similar engine, you can have neck-snapping torque and big power. Besides, a week of brown-bagging our lunches made up the difference. These heads, with their cc intake ports, are the biggest we tested, and it must be mentioned that the large port size would most likely work better on engines with more than ci such as the latest and small-blocks. Because our test engine was a smaller we were not able realize the power numbers that these heads produce on big-inch small-blocks.When it comes to maximum power production, there are a number of different routes available to enthusiasts.

Some opt for the easy route, choosing some type of power adder like a turbo, supercharger, or even the good old standby, nitrous oxide.

PRI 2019: Choose ProMaxx Performance For All Your Cylinder Head Needs

Power adders are certainly capable of dramatically boosting the power output of almost any type of combination, but what if your goal is to do it the old-fashioned way?

The all-motor route is a time-honored tradition that, while slightly more difficult than adding boost or juice, is for many ultimately more rewarding. Making power without the use of power adders requires considerable planning and experience on the part of the engine builder.

Much more so than when adding boost, all of the critical components must be matched to optimize every last ounce of power production on an NA combo. Missing on just one critical item can ruin a perfectly good combination.

Maximum power comes from the selection of parts working harmoniously. There is nothing better than the sweet music of a big-inch motor running at full song.

Maxxed Out: ProMaxx BBC Head Test

When it comes to power, major effort is placed on what we call the big three, namely heads, cam, and intake. The other components used in the build-up, like exhaust, carburetion, and even the oiling system, are important, but big power comes mainly from the big three. Since the internal combustion engine is nothing more than a giant air pump, the more air we can convince our pump to process, the more power it will produce.

Potentially confusing, this statement does not suggest we seek merely to maximize the air flow of each individual component. The components must operate together to maximize the flow through the engine as a whole. Simply improving one of the many components may or may not improve the whole. The complex nature of so many individual components working together is why engine builders spend so much time testing different combinations.

Cylinder Head Vital Specs - Power Curves

This particular dyno session was designed to illustrate the merits of a new set of big-block Chevy cylinders heads offered by ProMaxx Performance. When they began, co-owner Jason Collins set some lofty goals for their line of performance products. Having come from a solid racing background, Jason understood racers and fellow enthusiasts needed affordable performance. The goal for ProMaxx was to offer a product line that combined performance, quality, and affordability. Being at odds, the combination of the three variables was a seemingly difficult task.

After looking at the results of this test, the gang at ProMaxx might just have pulled off the hat trick. On paper, the specs on the BBC heads supplied for the test certainly looked impressive.

Though ProMaxx offered both smaller, as-cast and larger CNC-ported heads featuring cc intake runners, we opted for the middle of the three available heads.Display Options. Already know the part number you need? Click here to enter them directly into your cart. If you are an international customer who ships to a US address choose "United States delivery" and we will estimate your ship dates accordingly.

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Promaxx heads???

What is this? Loading Today Estimated International Date Loading Today. SBC cc Hand Blended 2. Low Price Guarantee. We're so confident in our low prices, we offer a Beat-a-Price Guarantee: We'll beat our competitors' advertised prices on any identical, in-stock product proof of advertised price required! Vertical Navigation Horizontal Navigation. Search Within Results. Narrow Your Results. Loading, Please Wait I am in the United States. International Customer Options. Delivery Options If you are an international customer who ships to a US address choose "United States delivery" and we will estimate your ship dates accordingly.

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