You hear this description thrown around quite often, but what is the design reasoning of each? An open chamber head will have a larger combustion bowl/chamber, which opens more area around the valves. The new open-chamber design was larger (118 cc, as compared to closed-chamber heads at 101 to 109 cc). This change offers better combustion in the chamber. In 1969, Chevrolet introduced the open-chamber design (Right). When the big-block engine was introduced in the mid-1960s, the heads had closed chambers (Left). Street cars or heavy street/strip cars are good candidates.” McInnis concurred, “Iron heads can offer great performance at a much lower cost than aluminum in any application where weight is not critical. The fact it dissipates heat very quickly, may or may not be an advantage, depending on what you are trying to achieve. The biggest advantage aluminum has over cast, is its lighter weight when compared to cast iron. Also, if damaged, they can be much easier to repair as well.” “An aluminum head is a bit more costly, but will typically outperform a cast-iron head because of its ability to dissipate heat and reduce detonation. “Probably the biggest reason to choose cast iron, would be because of cost, or if you had to follow some type of rules for a certain class of racing,” said Campbell.
This guide to budget-friendly big-block Chevy heads will be limited to assembled units that are great choices for street and street/strip use, and are sold as a set for less than $2,500.Īluminum heads are hard to beat when it comes to performance, but cast-iron heads are still a viable option for restoration or certain performance needs. To help you decide what big-block Chevy heads are right for you, we have assembled a guide that will help you make an informed choice. Also, knowing as many details about the engine (bore and stroke, compression, and whether using boost or nitrous) are very important when selecting the right head design for the job.” A street engine that will see a lot of low- and mid-range RPM is very different than a drag race engine that is run at peak RPM for short times. Campbell agrees, “The most important factor is knowing the intended use for the combination. With some smart-shopping techniques – like knowing what your overall engine goal is – you can purchase a set of big-block cylinder heads without breaking the bank or compromising power output. To get you some solid input, we reached out to Eric Blakely of Edelbrock Performance, Mark Campbell of Racing Head Service, Jack McInnis of World Products, and Tim Torrecarion of Air Flow Research (AFR) and got some solid advice about choosing cylinder heads. Buying certain parts just because they work great on your buddy’s car might actually cost you more in the long run. Instead, you should focus on proper usage parameters. When you are assembling an engine, one of the worst things you can do is focus on “less expensive” parts. At $1,986.60 a pair, they are great upgrade. These cylinder heads deliver great throttle response and power from 1,500 to 6,500 rpm. The Edelbrock 60455 Performer RPM O-Port cylinder heads are perfect for street performance, daily drivers, street rods, and muscle cars.
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