What is the best factory LS head?
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 241 LS1 heads good?
The 241 heads were used on 5.7L LS1 applications and are considered by many to be just a minor step up in performance from the 706. In terms of peak flow, the 241 heads offered 242 cfm at 0.700-inch lift from the 199cc intake ports, and 204 cfm from the 71cc exhaust ports.
Can I put 6.0 heads on a 5.3 engine?
Registered. You’ll lose compression if you use cathedral port 6.0 heads on your 5.3. The chamber is larger. The rectangular ports should not be used on your engine.
How much HP does 243 heads add?
A stock pair of 243 heads can gain about 20 hp on a bolt-on LS1. Since you already have a cam, you might see a bit more. If your budget does not allow a full porting job, don’t sweat it, just swapping to 243 alone will be a big help.
What’s the difference between 241 heads and 243 heads?
The 243 heads flow 10 cfm more on the intake side, and like 7 cfm more on the exhaust side (if memory serves me correctly). The combustion chamber is a difference of 3cc smaller on the 243’s. Valve sizes are identical in both sets of heads.
What heads come on a LM7?
3 small block engine used in GM trucks between 1999 and 2007. For marketing purposes, it was also known as the Vortec 5300. The information listed here is for the stock LM7 engine….GM LM7 Engine Specs.
| LM7 Cylinder Head Specs | |
|---|---|
| Cylinder Head Bolt Size (1999-2003) | (8) M11 x 2 x 155, (2) M11 x 2 x 100, (5) M8 x 1.25 x 45 |
Is the LS7 cylinder head interchangeable among blocks?
The LS7 heads however, feature CNC-machined chambers, intake ports and exhaust ports. All LS cylinder heads, with the exception of the LS7 heads, are interchangeable among blocks. The LS7 cylinder heads cannot be mounted to other LS blocks, as the wider valve layout would result in valves contacting the bores.
How much horsepower does a LS3 cylinder head have?
The factory-built motor dished out about 430 horsepower right out of the gate, and the cylinder heads play no small role in that impressive output. The LS3 heads hit the flow bench.
How big are the intake ports on an LS block?
Intake port dimensions also vary between the two head versions. The intake ports on the head used for the LS3, LS9 and L92 are 1.250 inches wide by 2.550 inches tall, while the intake ports on the LS7 head are 1.350 inches wide by 2.40 inches tall. Which LS heads will physically swap out to the various LS blocks?
What’s the difference between the LS3 and LS9?
“The LS3 also uses conventional casting process and material, while the LS9 utilizes a stronger material and uses rotational casting process to increase the material density at the cylinder deck surface, and the valves used in the LS9 are lighter than those used with the LS3 head.”