What are the good LS heads?
What are the good LS heads?
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 193 heads good?
No. 193 is typical of most TBI ’87’95 iron heads, with half the intake valve-bowl approach blocked off—not good for serious performance. With any decent cam, most castings in this series of heads will give up at 3,500-4,000 rpm. Knight says the main exceptions are the ’87-’91 Camaro/Firebird 350-TPI head (casting No.
How big of a cylinder head do you need for a Chevy?
For a big-block Chevy that came with 260 cc intake ports he upgrades to a 310 cc intake cylinder head. Joe also made the point that there is virtually nothing you can do to improve on factory performance below 4,500 rpm so the OEs obviously got the port-sizing pretty close to optimum for the street.
When did Chevy make oval port cylinder heads?
There were no original Mark IV oval-port aluminum heads from the factory Oval-port heads are found on trucks and passenger cars from 1965 through 1990 and they are an excellent choice for street performance applications, particularly in heavier cars.
What kind of head does a corvette have?
The aluminum angle-plug cylinder heads have screw in rocker studs, 1.94-inch intake and 1.50-inch exhaust valves and 58cc combustion chambers that yield a crisp and responsive 10:1 compression ratio. Also included are lightweight valvespring retainers that weigh half as much as the previous design.
How are cylinder heads related to engine displacement?
Joe has always based his engine combinations around his cylinder heads. He makes an interesting correlation between port volumes and engine displacement. He said that he looks at what size intake port the engine came with – for example a 350 small-block Chevy came with a 160 cc intake runner.
What kind of head does a small block Chevy use?
All LT1 engines use center-bolt valve covers. Standard Gen-I small-block Chevy heads position the valves at a 23-degree angle to the deck. In 1989, Chevy introduced the 18-degree Bow Tie aluminum head that shifted the valve-angle vertically, while simultaneously raising the intake port to take advantage of this angle.
What kind of cylinder head did Chevy have?
The famous double-hump cylinder heads. Casting numbers 3782461 and 3782461X used 1.94 and 1.50-inch valves. These were commonly called “Fuelie” heads.
How big is the valve on a Chevy small block?
The stock valve size for this head is the 1.94-inch diameter. The test data included in our flow info is a little different in that this head was fitted with a 2.02-inch valve. The catalog states that the larger valve can be added with a new valve job, which is what happened on this head.
What’s the difference between vortec heads and SBC heads?
•Port flow was designed to be high in the .300-inch to .500-inch valve lift area to make power with relatively low-lift truck camshafts, whereas the old school Gen I heads liked higher-lift camshafts to make their power. Vortec heads have the “sawtooth” pattern casting mark on the end of the heads.
