What is a 18 degree SBC heads?

The CHI 18 degree head features repositioned valves, moving them closer to the bore centreline significantly increasing potential flow to suit power well over 700HP. As standard these heads come as standard with CNC machined combustion chamber, extra thick decks suitable for forced induction or nitrous applications.

What degree are SBC heads?

The number refers to the angle of the intake and exhaust valves in relation to the head’s deck surface. By contrast, conventional small block Chevy heads have a valve angle of 23 degrees.

What are 15 degree heads?

One of the first specs noticed is the “shallow” valve-angle of 15-degrees, which is five less than a conventional 20-degree cylinder head. The lower valve angle allows the engineers to increase the valve size as well as move it away from the cylinder wall for increased flow, otherwise known as un-shrouding the valve.

What is an SB2 2 engine?

SB2 – Foundation for Horsepower The SB2 – short for Small Block, Second Generation – is the first engine designed by General Motors specifically for NASCAR racing. It simplifies preparation for racing teams and reduces the overall cost of building and maintaining an engine.

What are SB2 heads?

The Chevrolet Performance SB2. 2 heads are purpose-built race cylinder heads for the small-block Chevy, most famous for their NASCAR success.

Are Promaxx heads made in China?

They are cast in China and assembled in sweet home Alabama.

What is a 12 degree engine?

A V12 engine is a twelve-cylinder piston engine where two banks of six cylinders are arranged in a V configuration around a common crankshaft. Due to the balanced nature of the engine and the smooth delivery of power, V12 engines were found in early luxury automobiles, boats, aircraft, and tanks.

How much HP gain with Vortec heads?

Most of these small block Chevy heads offer a power increase of around 40 hp, and even the iron Vortec heads were worth 20 hp over stock. The two best small block Chevy heads in terms of peak horsepower were worth more than 60 hp. But, as you’ll see, there’s much more to the story, so read on.

Will SB2 heads on standard block?

You can use a standard block, but you need to run a lifter with one cup in each of the pairs offset, the same as what you use in an 18 degree engine. You can use double offset as well, but it puts more stress on the lifter tie bars. You can use an SB2 block that offsets the intake lifter by using a bent tie bar.

What motor does Ford use in Nascar?

FR9 Ford
With the recent introduction of the specially built FR9 Ford NASCAR engine, Roush Yates Engines, the sole supplier of Ford NASCAR engines for the three top series, now has a surplus of Windsor-based 358-inch engines, which you can purchase through RYPP.

What does 18 degrees mean on a Chevy head?

The number refers to the angle of the intake and exhaust valves in relation to the head’s deck surface. By contrast, conventional small block Chevy heads have a valve angle of 23 degrees. So what’s the big deal about 18 degrees?

What’s the difference between a 23 and an 18 degree head?

For example, the 18 degree head’s intake manifold mounting flange is angled at five degrees (standard is 10 degrees) to accommodate the raised intake runners. That requires a special 18 degree intake. The 18 degree heads are also taller than their 23 degree cousins, and require longer valves and special head studs.

What does the 18 degree cylinder head do?

What does the Chi 18 degree head do?

CHI CNC ported intake and exhaust ports are designed for circle track or drag racers who want to benefit from huge horsepower increases over traditional performance chevy heads. The CHI 18 degree head features repositioned valves, moving them closer to the bore centreline significantly increasing potential flow to suit power well over 700HP.