How good are Dart Pro 1 heads?
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Compared to the stock intake ports, the Dart Pro 1 CNC heads offer twice as much flow (325 cfm vs. 160 cfm). The exhaust flow is even more impressive, with the Pro 1 heads coming in at 235 cfm compared to just 112 cfm for the stock heads, a gain of over 110 percent.
Do aluminum heads increase HP?

Depending on your cam, you can gain anywhere from 40-70hp. Cam and heads can gain you 100+hp.
Are aluminum heads better than iron heads?
Aluminum heads have higher compression, are lightweight and have better ports when compared to iron heads. However, iron heads are usually preferred by daily drivers, since it does not develop problems like aluminum heads over time. Aluminum heads may have to be removed and repaired more often than iron heads.
Where are Dart cylinder heads made?
The immense CNC machining centers that produce Dart heads and blocks from raw castings are located in a separate manufacturing facility in nearby Melvindale, Michigan.

What is the benefit of aluminum heads?
Aluminum heads will dissipate heat faster. This allows for higher Compression Ratios with less risk of Detonation. The cooler head also delivers a cooler air/fuel mixture to the combustion chamber. Cooler air is denser and can make more power.
Is Dart and World products the same company?
You have to remember that World & Dart used to be the same company. They split in the 1990s. When they were together, World was all of the cast iron stuff and Dart was exclusively aluminum. After the split, World continued on with cast iron but also added some new aluminum parts too.
What is a Dart Big M block?
Dart engineered the Big M to be the strongest, most reliable, and easiest to build big block on the market. With deck heights of 9.800” and 10.200” and bore sizes up to 4.600”, the Big M gives you the versatility to build a wide variety of engine combinations. 300” thick with 4.625” bore).