How do I identify a Vortec cylinder head?
Vortec heads have the “sawtooth” pattern casting mark on the end of the heads. The bowl area is wide around the valve guide – much wider than the old GM cast iron ‘camel-hump’ heads. The intake and exhaust valves and valve seats have a three-angle grind from the factory.
How do I identify my GM heads?
See “A” in the picture General Motors. The casting number of a GM cylinder head is located between the valve springs. It’s a long number of 6 to 8 digits. See “A” in the picture General Motors.
How do I identify Oldsmobile heads?
The Oldsmobile factory-production small-block cylinder heads are identified by a number cast into the front lower portion of the head next to the number-1 and number-8 cylinders. The oldest castings have a lower number and the latest production castings have a higher number.
What size valves are in Vortec heads?
1.94/1.50-inch
These production Vortec heads were used in the new Vortec 350ci engine intended for -, -, and 1-ton Chevy pickups. Amazingly, this mundane, production-based 1.94/1.50-inch valve head performed better than the iron Bow Tie head.
What is the difference between a Vortec and LS?
Engines with the LS designation were typically set up for passenger car duty while the Vortec line was for GM’s SUV and truck lines. In other words, the difference is in the marketing and where the various engines were going to be used across the GM brands.
How do I know if my GM is a double hump head?
These heads got their nickname because of the raised identification shape on the each end. It’s two half-ovals connected by a straight bar-most easily described as “two humps.” Some of these are also nicknamed “Fuelie” heads because a version appeared on fuel-injected 327-powered Chevy Corvettes.
Where is casting number on Chevy heads?
For CHEVY engines, the block casting number is usually located on a ledge found at the rear of the block and has 6 to 8 digits. This ledge is located near the bellhousing. Sometimes the last three digits of the block casting number are cast into the block on the side.
Are Mopar 906 heads good?
While 906 heads do perform well when ported, the labor involved with hand-porting these heads, combined with the cost of new valves, springs, etc, has made it more economical in most cases to simply buy a new set of aluminum aftermarket cylinder heads.
Where is the casting number on a cylinder head?
HEAD CASTING NUMBERS The head casting number is located on the top of the cylinder head. The valve covers must be removed to find the number. Keep in mind that if you remove the valve covers, new gaskets may be needed.
How much HP will Vortec heads add?
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.
What is the max lift on Vortec heads?
around 0.420 inch
The factory Vortec heads use a light, single-wire valvespring with a damper that generates between 70 and 80 pounds of load on the seat. Because these heads are meant to work with a 1.5:1 rocker, their tall valve guides can only handle maximum valve lifts of around 0.420 inch.
Is 5.3 and 6.0 the same block?
Flassh, Actually the 6.0 motor is the same small block that the 5.3 utilizes. The 5.3 is 327 cu. in. and the 6.0 is the same block bored to a 366 cu.
How much are Chevy double hump heads worth?
461 and 462 double hump complete heads should be worth or priced at $200 a set at the very least. With all the choices in new motors and heads these do not have the interest they once had.
How do I find my casting number?
These can be found on the block, cylinder head, transmission case, differential housing, and other cast iron parts. Depending on the make and model of your vehicle they can be located in different areas.
How many cc are 906 heads?
Though factory chamber volume is 79 cc’s, the CNC ported 906 chamber volume is increased to 86 cc’s. Hardened valve seats are available at the customer’s request, and the heads can be further milled to reduce chamber volume if needed.