Where are RHS heads made?

As the new business grew larger, the RHS operation and name was idled. The intent was always to bring the name and reputation back when the timing was right. The Pro-Topline situation became that opportunity. The New Zealand foundry where the heads are cast is actually a purpose built operation for cylinder heads.

Are RHS LS3 heads good?

The Best Value in LS Heads – RHS Pro Action LS3 Heads are simply the best bang for the buck LS heads available. Made from premium materials with excellent attention to detail and available with several COMP Cams spring kits, this is the best value in LS heads.

Are aluminum heads worth it?

Yes they are worth it. Pretty much every aftermarket head is worth a good power increase over any stock head. I like the aluminum heads since they are easier to port, repairable, and give a nice weight reduction. They usually are only a few hundred more than the iron heads.

Are aluminum heads better than cast iron heads?

Durable Build Both aluminum and cast iron heads can last wear and tear, but cast iron will be the more durable choice. Aluminum is a very soft material, while cast iron is sturdy and can handle even excessive forces. Cast iron heads can also resist structural changes that are brought about by high temperatures.

Who owns RHS heads?

It pioneered the crate engine in the ’80s, delivering turnkey engine packages to satisfied customers. Ultimately, Smiltnieks became the sole owner of RHS when Woodward and McWhirter retired.

Are LS3 heads good for boost?

Just as they had on the naturally aspirated engine, the LS3 heads offered more power under boost, but the extra power also increased the backpressure. The boost pressure peaked at 7.6 psi, but dropped to 6.4 psi at 7,000 rpm.

How much HP does aluminum heads add?

How much HP do heads add? Depending on your cam, you can gain anywhere from 40-70hp. Cam and heads can gain you 100+hp.

What is the advantage 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.

Who owns racing head?

It pioneered the crate engine in the ’80s, delivering turnkey engine packages to satisfied customers. Ultimately, Smiltnieks became the sole owner of RHS when Woodward and McWhirter retired….

180cc Air Flow Specifications
Valve Lift	Intake Flow in CFM	Exhaust Flow in CFM
.700 in	260.0	203.0

Which LS heads are the best?

The LS6 was designed specifically by GM to surpass the LS1 as the best performance head, and it did such a good job that the “243” casting was recycled on the LS2. Aside from the LQ9, which is a copy of the LS6, these are the best performing of the OEM cathedral ports.

Are LQ4 heads cathedral Port?

Cathedral port heads came on the original (Gen III) LS1, but were also used on the performance-oriented LS2 and LS6 versions. Cathedral port heads were bolted on literally millions of truck variants, which included (among others) the 4.8L LR4, the 5.3L LM7, and 6.0L LQ4.

What makes the RHS Pro Elite heads different?

RHS designed these heads to flow big numbers without the need for crazy, exotic parts up top. That is why the Pro Elite heads are designed for stock-style valvetrain components. Even so, the valve angle has been rolled 2° flatter toward the piston.

Are aluminum heads good for drag racing engines?

For big block Chevys, these aluminum heads are great for engines being built for drag racing thanks to their excellent list of features. RHS offers two different sizes of CNC ports on these heads.

What are the best aluminum heads for a big block Chevy?

The crown jewels of RHS are the Pro Elite line of heads. For big block Chevys, these aluminum heads are great for engines being built for drag racing thanks to their excellent list of features. RHS offers two different sizes of CNC ports on these heads.

Why choose an as-cast head from RHS?

RHS also wanted to design a head that would share many of the same great qualities of the Pro Elite heads, but in an affordable as-cast design. Working with their patented Clean Cast Technology, they were able to come up with a head design that rivals many CNC-ported heads.