What is the difference between 906 and 062 Vortec heads?
The only difference between the #062 and #906 Vortec head is in the exhaust seat of the HD/1-ton truck #906 version, as described above. The #062 has a 3-angle grind on a standard induction-hardened seat, as does the non-HD #906 head.
How much HP can you make with Vortec heads?
The original answer was related to modifying the heads to accept more valve lift. Our original answer combined the Chevrolet Hot cam with a set of these Vortec heads. Our estimate then and now is around 350-375 horsepower. Your question relates to porting the Vortec heads to improve the flow, which is a great idea.
What casting numbers are Vortec heads?
Types of GM Vortec Heads L31 Vortecs comes in two different casting numbers, 10239906 (#906) or 12558062 (#062). Originally, the stock #906 casting head was available in two versions.
What do Vortec heads flow?
In essence, the Vortec head uses the iron LT1 chamber intake and exhaust ports in a standard-water-flow iron head. These production Vortec heads were used in the new Vortec 350ci engine intended for -, -, and 1-ton Chevy pickups.
Do they make aluminum Vortec heads?
World Products introduces aluminum Vortec-style heads.
Do Vortec heads use different headers?
The fact is Vortec heads breathe like crazy and make better horsepower and torque than any previous Chevrolet production design. Vortec heads look similar to any ’87-and-later center-bolt head-the ends have the same accessory mounting holes, the exhaust flanges are the same, head bolt patterns are the same, and so on.
Do aluminum heads add HP?
Because the alumiunm bleed off heat and heat is power. Now almost all the power is made in the heads. If you go to a head that adds a little CR, better flowing ports, bigger valves etc you will see an increase.
Are Vortec heads aluminum?
Chevy Vortec Aluminum 350 Cylinder Heads 64cc 2.02/1.60 NEW HI-FLOW Aluminum 64cc Cylinder Heads. 190CC intake ports. Vortec design combustion chamber.
Do Vortec heads crack?
Did you know that 80 percent of used vortec heads are cracked? Yes, that’s right, they are. That means there are only two types of GM vortec heads, those that are cracked, and those that are going to be cracked, including yours.
Do Vortec heads need guide plates?
Re: Pushrod Guide Plates for Vortec Heads No, the guide plates are simply to keep the rocker aligned on the valve stem tip.
What are 202 heads?
“202” refers to the intake valve diameter of 2.02″. Fords and Chevys usually don’t have an intake problem… they usually have an exhaust problem.
Are Vortec heads cast iron or aluminum?
The Vortec head’s bang-for-the-buck value was outstanding, but it did have its shortcomings. First of all, the World Products head is aluminum, rather than cast iron like stock Vortec heads.
What are the casting numbers on a Vortec?
Here’s a quote from the link above: “The L31 Vortec comes in two different casting numbers, 10239906 (#906) or 12558062 (#062). Originally, the stock #906 casting head was available in two versions. One version had an Inconel exhaust seat with single angle valve grind and was available on 1 ton trucks.
What’s the difference between a Vortec 062 and a 906?
The only difference between the #062 and #906 Vortec head is in the exhaust seat of the HD/1-ton truck #906 version, as described above. The #062 has a 3-angle grind on a standard induction-hardened seat, as does the non-HD #906 head. The 062 does flow slightly better on the exhaust side at low lifts but the advantage over a 906 is very slight.
How many hold down points do vortec heads have?
With Vortec heads you have to switch over to an intake with 8 hold down points. And also the center bolt down valve covers. There used to be Vortec heads on the market that took either the older style intake or the newer Vortech style and you could run the older style valve covers.
What’s the difference between 062 and 062 Vortec cylinder heads?
They both make the same amount of power. The 062 is the head you will get when buying the Vortecs from the dealership/GMPP. Vortec heads were designed based on the 1996 Caprice 9C1/Impala SS LT1 cast-iron head castings. The only difference is the water jacket revision so these heads could be used on conventionally-cooled small blocks.