Are 440 Source heads any good?
Stock 440 heads just don’t allow enough flow for serious performance, and stock 440 heads are all made from cast-iron, making them heavy as well. Fortunately, 440 Source has an economical alternative to stock 440 heads with their Stealth line of aluminum replacements.
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.
Can you run higher compression with aluminum heads?
Remember that an aluminum head is more tolerant of high compression, and all other factors aside, a higher compression motor will make more power than a low compression motor, provided that its unique compression-related requirements (fuel octane, camshaft, etc.) are met.
Do aluminum heads make more power?
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.
What is the compression ratio for 93 octane with aluminum heads?
Because aluminum conducts (dissipates to the cooling system) heat much faster than cast iron does, you can run 10.5:1 with aluminum heads on 93 octane.
Whats the highest compression you can run on pump gas?
What Is The Highest Compression You Can Run On Pump Gas? The pump-gas street motor can be compressed to 11:1 or 12:1, but you’ll need this simple advie to do it. Four-stroke engines (or four-cycle engines) are called so because the piston passes up and down the bore four times during the engine’s production process.
What temperature is too hot for aluminum heads?
This poses a significant challenge on existing cast aluminum alloys for high temperature performance. Over the past decade, the maximum operating temperature of components like cylinder heads increased from approximately 338F (170C) to temperatures exceeding 392F (200C).
Can I run higher compression with aluminum heads?
What octane is needed for 11.5 to 1 compression?
95 Octane
95 Octane. Gasoline with this octane number is known in Indonesia under the brands Pertamax Plus (produced by Pertamina), Super Extra (produced by Shell), and Primax (produced by Petronas). This type of gasoline is advisable for car engines with compression ratios of 11:1 to 12:1.
Will aluminum heads run cooler?
The big advantage with aluminum heads, besides being almost half the weight of cast iron, is that they run cooler and allow you to run a little more compression (or cylinder pressure) on the same gas without pinging or detonating.