Are aluminum heads better than iron heads?
Both types of heads can be damaged if the engine overheats. Cast iron is much more durable. However, aluminum heads are easier to fix. The metal is softer and easier to weld and machine.
Are Mopar 906 heads good?
While 906 heads do perform well when ported, the labor involved with hand-porting these heads, combined with the cost of new valves, springs, etc, has made it more economical in most cases to simply buy a new set of aluminum aftermarket cylinder heads.
Are 440 Source heads any good?
We wanted to see what kind of flow numbers and power these heads make in both stock and CnC ported form, so we’ll run them across the flow bench and dyno test them on a 440 engine….To Port or Not to Port – Stealth Fighter.
| Price Tag | |
|---|---|
| 915 Cast Iron Cylinder Heads | Cost varies by parts used, repairs and machine work needed, and port work |
Why are aluminum heads better than iron?
Between the two, aluminum heats much faster compared to iron cast heads. It can heat up at a rate that’s thrice as fast. This will make starting up your engine much easier and in a lesser amount of time. The great thing about aluminum is that it can also reduce risks of detonation and pre-ignition.
Why can you run higher compression with aluminum heads?
You know-bench racing stuff like, “you can get away with more compression ratio with aluminum heads because they dissipate more heat,” and “iron heads make more power because they keep the heat in the chambers.” We’ve heard those things a million times, and we’ve written it a bunch too.
Do you lose compression with aluminum heads?
Aluminum heads are said to drop between 1/2 and 1 full point of your effective compression because they draw more heat out of your combustion chamber (the one place you actually want some heat).
How can you tell a 440 head?
440 has the engine I.D. codes stamped on a machined flat surface (about 3/4″ x 2″) located in front of the intke manifold towards the dirver’s side of the car on the block. The 383/400 has this pad located just in front of the driver’s side cylinder head where the head bolts to the block.
How much compression can aluminum heads run?
As mentioned previously, with a cast iron-headed motor on the street, somewhere in the range of 9.5:1 is the practical limit for compression; with aluminum, 10.5:1 or so is a pretty good maximum figure.