Big Block Chevy Heads. Even as a stock replacement there is a significant performance advantage. These heads don't need intake valve cutouts and possess great potential for producing high output on street small-block engines. Be warned that some sellers of aftermarket heads may not be checking the installed height when assembling the heads, and may not be setting them up to the correct pressures. 496 or larger engines can get by with less compression but no lower than 10:1. I ported a set of them for a nonnitrous street application for a friend right after they became available. At 5, 600 rpm the power increased from 440 to 512 hp. How to Build Chevy Big-Blocks: Cylinder Head Guide. We now use the AFR heads on most all of our bbc engines builds all the way up to the 572 engine. It's not enough to ask them what brand hardware they use because it would be impossible for you to distinguish it from one brand or the other by simply looking at it. 575, AFR/Bravo heads, our new Brawler carburetor, and a single plane intake. AFR as-cast heads feature CNC pocket porting. Suffice it to say, I have had hot street 496 builds making very close to 800 hp on the 325-cc port heads and 540 street builds using the 335 all-CNC-finished head at 825 hp.
But since that was published, I have had the opportunity to be involved with builds that utilized World Products' latest iron heads and the new (as of 2014) Engine Quest (EQ) heads. It is the perfect size to offer the best balance of power while putting a relatively low amount of stress on the valve train. Although both worked well out of the box, a few days of experimentation showed the EQ heads to have great potential. At 6, 000 rpm, the AFR heads posted a staggering 130-hp gain! 400-inch lift and reaches an increase typically of 18 to 20 cfm at 0. I installed a set of the 350-cc port heads in out-of-the-box form on a mule engine. Afr 265 big block chevy heads. 5:1–big-blocks that have produced 1 hp for every 3. Valve Guides: 1/2" OD Int = Mag-bronze Exh = Phos-bronze (. There are no drawbacks! These heads replaced a borrowed set of unported heads from a reputable manufacturer. One other important factor is that the head gaskets must have an opening of at least 4. Our Melling springs are 1. We have looked at several others on the market, and still find many issues with them that are not acceptable. Some computational fluid dynamics studies by my good friend David Woodruff of Design Dreams indicate that even if the port is sized so that no additional flow is produced, the velocity and port energy are often higher.
700 lift, flowed 415 cfm (for the good port) and 409 cfm (for the bad port). What you are after is the best possible combination of airflow and port velocity. This would then side load the valve tip with undue pressure, creating a serious wear problem on the side of the valve tip and create excessive wear on the valve guides in the heads. Outside of following the basic porting steps shown in my previous Chevy big-block book, getting the best airflow possible requires a flow bench. Afr big block chevy head blog. The cams in these engines often have far too wide of an LCA, and as a result they fail miserably. So far problems have been non-existent.
We did not do any "A versus B" tests, but we have done more than enough big-block dyno builds and tests to know what is good and what is not. Big block chevy performance heads. Castability: good, for general purposes. We are aware of only one other rocker arm stud besides ARP on the market of decent quality, and that's from the GM Performance division, and it's fair to say they are most likely supplied to GM by ARP under private label. Our next test will be with Quickfuels's top of the line Q series carb, and then were going to try a custom built Pro-Systems carb. The testing methods we use are considered to be on the conservative side.
Crank cases, cylinder heads, and manifolds. These are respectable figures for what is essentially a very low-cost head. GENUINE ARP ROCKER STUDS, AND COMP ADJUSTABLE GUIDE PLATES INCLUDED. Description: AFR's 335cc BBC Enforcer Cylinder head features their Permanent Mold "As-Cast" Technology surfaces on the intake runners, exhaust runners and combustion chambers that allow for Details ».
The flow increase is approx. 88 valve split Iron Eagles produced 370 and 282 intake/exhaust CFM at 0. Some of those early rectangular-port heads actually made as much as 25 hp more with the bottom 1/4 to 3/8 inch of the port filled in. If the customer on the phone is considering the purchase of a set of Chevy big-block heads, the first question is often, "How big a port volume do I need? "
Cylinder Heads, Aluminum, 345cc Intake, Partially CNC Ported, with Valve Job, 121cc CNC Chambers, Bare, BBC, Pair. AFR Big Block Chevy Heads. So, assuming a middle-of-the-road figure of 4 cfm per hp, and a typical intake flow of 390 cfm at 0. It makes a great amount of overall power on bbc street rods. After some significant tweaking of the Dominator's calibration by AED Performance carb guru Jeff Harris, plus cam and ignition timing, plug style, and exhaust system, it produced impressive results.
I suspected that these heads were better than rumored because the only problems that these two initial builds had were with the tires. After about four days of work, I improved the top-end flow by just 20 cfm. The "on track" performance reflected the high-flow figures seen for the relatively small port volume. All three will have the same cam and cyl.
Below are our dyno results on our newest version of the 572 Pro Street engine. Carburetor Spacers from are used for everything from air cleaner clearance to fine tuning the torque curve of your engine. Recommended for radical street/strip or " Details ». My typical and somewhat cynical response is: "That depends on how badly spec'd the rest of the engine is. " Spark Plug: Straight,. I am not sure who started the 24-degree trend (it may have been Dart) but most of the industry followed suit. When this is the case, to be competitive it is necessary to have the heads ported by an expert in this field. We're going to list below our actual dyno results on every size of bbc engine we have dynoed with this cam. Corrosion resistance: excellent, anode oxidized.
The green curve is the percentage of improvement of the intake flow.
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