Afr Big Block Chevy Heads
These are creditable figures as far as flow goes. These are true multi-purpose heads for street, drag race, and power boat applications. And it can be up and running within a weekend. Next, reference the output number on the left-hand scale.
Afr Big Block Chevy Head And The Heart
Peak torque was up from 572 to 605 ft-lbs and peak horsepower was up from 525 to 610. This cam has a step nose for use in OE roller blocks. The backcut feature is not be mistaken for undercut. I use the word "conventional" because the real excitement with BMP is the 16-degree heads they introduced in 2012.
Afr Big Block Heads
Smaller diameter springs may be in the correct spring pressure zone, but they usually have a shorter life. 1:1 compression ratio, using a new special custom grind cam that is only 575 lift. Cylinder Heads, Magnum, Aluminum, Bare, 121cc Chamber, 315cc Intake, Chevy, Pair. 6500 rpm making 868hp is very impressive to say the least. 2:1 compression ratio and 736 horse power at 5900 rpm on a pump gas 555 engine with 10. If you over-estimate the port volume and, consequently, the port's cross section, the price you pay is at least a reduction in output until the very top end of the RPM range. Afr big block chevy heads for sale. CHECK OUT OUR NEWEST DYNO RESULTS POSTED BELOW USING THESE HEADS ON OUR BBC 572 PRO-STREET ENGINE. Official dyno report on our 572 engine with cam choice #2, AFR/Bravo heads, our new Brawler carburetor, and a dual plane intake. These Brodix oval-port heads are very strong on power delivery and the resultant 899 hp proves it. Although it is called an oval port, the design is best described as a hybrid oval/rectangle port. If you are building for marine use, where lake or ocean water cools the engine, you need iron heads to combat corrosion. Just for the record, on the first set of 290 heads I had the ports cc'ed out at about 300.
Afr Big Block Chevy Heads Of State
In the lower section of this ad, you will find valuable information on how these heads perform when used with various engine sizes and cam combinations in street rod form. High grade hardware is nearly double the cost, but we know for a fact that this is very important for the performance and longevity of a set of cylinder heads. I am not sure who started the 24-degree trend (it may have been Dart) but most of the industry followed suit. Short of X-raying them, the castings appeared to be as good as many of the U. To determine required intake port volume, first decide on your target horsepower; be realistic or it will be a step backward. These heads have the correct seat diameter to allow use of these valves. TFS rectangular port heads have a generous corner radius. Check out the dyno reports below. The "on track" performance reflected the high-flow figures seen for the relatively small port volume. How to Build Chevy Big-Blocks: Cylinder Head Guide. They come standard with stainless steel 2. As a result, the now-closer chamber wall increased intake valve shrouding. That is the downside, but on the upside the price of these heads is almost half the cost of their nearest U. We have no other eBay names, nor are we associated with any other company regardless of the similarity in the name or location.
My typical and somewhat cynical response is: "That depends on how badly spec'd the rest of the engine is. " Below is a copy of one of our invoices from Comp Cams showing several of our rather large purchases of valve train hardware. 3-6 points on the flow bench, and possibly more, depending on the initial flow rate of the heads. These heads are well suited on 4. This cam is our most popular choice for our street rod bbc engine builds. To give an idea of how this works in practice, let's look at some engines that have produced some creditably strong results: a 305-cc port producing 825 hp, a 355-cc producing 1, 080 hp, a 280-cc producing 685 hp, and a 320-cc producing 880 hp. Afr big block chevy head and the heart. Once a particular as-cast head in out-of-the-box form is tested, I almost always do a basic porting job, which involves narrowing the guide bosses and blending out the rest of the port. AFR's smallest rectangular heads are commonly referred to as "as-cast" heads, but they're actually semi-CNC finished because the bowls are machined.