Do aluminum heads give you more horsepower?
Aluminum heads will dissipate heat faster. The cooler head also delivers a cooler air/fuel mixture to the combustion chamber. Cooler air is denser and can make more power.
Can you use stock head bolts on aluminum heads?
If you’re running a 289, you can use the stock ARP head bolts for such and run a hard washer under the head, or, you can purchase the special bolts to use the alloy heads on a 289/302; or, you can purchase a set of studs for a 289 block.
Are SBC 441 heads good?
The 441 has a reputation as a good-flowing head among the production 76cc chamber heads. In this particular case, it lost out to the 882 head, but overall it’s a decent head that responds well to pocket port work and larger 2.02/1.94 valves….
| GM 441 IRON | |
|---|---|
| Port: | 155 cc |
| I Flow @ 0.400: | 194 cfm |
Do aluminum heads warp easy?
Aluminum is less prone to cracking and warping than cast iron is. It cools down faster, throws heat faster, and is repairable, where cast iron has none of these features.
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.
How much more compression does an aluminum head have?
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.
Do aluminum heads need special bolts?
You need some ARP head bolts 6 or 12 point is a personal preference. They are a bit longer and have hardened washers to compensate for the extra length. You must run the hardened washers on alumanium heads to prevent galling of the head.
Can you machine aluminum heads?
Machining Differences Since aluminum is softer than cast iron, boring and milling bits last longer when machining aluminum. Carbide works well on both cast iron and aluminum, but if you are using superabrasives the best choice for aluminum is PCD.
Do heads always need to be resurfaced?
Cylinder heads may need to be resurfaced; to restore flatness or to just improve the current surface finish. A cylinder head may need to be resurfaced; after welds or other repairs have been made; or milled to increase the compression ratio.
Why choose Pro-Filer SBC heads?
Whether it’s circle track, drag racing or street performance the Pro-Filer All-American Series SBC cylinder heads are the solution for your big horsepower needs. Featuring powerful port designs that are packed with air speed and unbeatable, made in the U.S.A., casting technology.
What are promaxx heads made out of?
The ProMaxx Performance Small Block Chevy Cylinder Heads are manufactured from cast aluminum and are offered with straight or angled spark plug ports, a variety of intake port runner, combustion chamber and valve sizes to work on all of your performance engine builds from mild to wild!
How many valves does a 210cc Chevy small block have?
Pro Filer Small Block Chevy All American Heads with 210cc Intake Runner, 2.08″ Intake Valve and 1.60″ exhaust valve. Flow data based on Cylinder #1 intake and exhaust port. Flow measured at 28″ of depression.
