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 do Vortec heads crack?

The crack around the exhaust valves are bad, but the crack between the coolant passage and bolt hole is scary.

What size are Vortec heads?

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.

How do I identify my Mopar heads?

The first would be on the top of the intake runner, under the valve cover. The second location is on the underside of the intake runner on the cylinder head. The two locations in which you can find the casting numbers on Mopar cylinder heads.

How much HP do 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. But, as you’ll see, there’s much more to the story, so read on.

Can I put Vortec heads on a 327?

The L31 Vortec heads will bolt onto any Gen I small block. Your 327 isn’t any different than any other Gen I small block built from 1955 thru 2002. The main difference with using the Vortec heads is the different intake bolt pattern as already mentioned.

What is the difference between Vortec heads and regular heads?

Vortec Intake Valve Seats and Combustion Chamber The Vortec combustion chamber is a kidney-shaped design that promotes better combustion and will have the spark plug located near the center of the chamber. The regular 350 head utilizes a 90 degree intake bolt angle while the Vortec makes do with a 72 degree bolt angle.

Can you fix a cracked Vortec head?

These heads usually crack from the center exhaust seats to the nearest cooling crossover or center head bolt hole. Minor head bolt hole cracking can be fixed by drilling and reaming the hole oversize (usually 5/8″) past the end of crack, about 1 1/8″ deep.

Whats the difference between an LS and a Vortec?

The Vortec truck harness has a large portion up on top of the intake manifold, is supported by it, and is covered or hidden by the plastic engine cover. The LS engine harness is configured much differently and the intake manifold is exposed and uses valve covers to dress up the engine.

How much HP does Vortec heads add?

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.

Can I put 360 heads on a 318?

Stock 360 heads are a great way to get power from a 318. Buit I would use them as a on the cheap method way to get there if the car/engine combo was track bound. A lack of low end torque is the result. In order to get past this weak area, a higher stall converter and gear ratio need to be installed.

What’s the difference between vortec heads 906’s and 062’s?

The only difference was that “some” 906’s had a single angle valve grind while all the 062’s had 3 angle. Anyone choosing to use a set of used GM vortec heads should remember that they are going on 20 years old. Most 20 year old heads probably have a pile of miles on them and need a valve job anyway.

Is the 906 casting head the same as the 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. The other version was the traditional three angle valve grind. Other than that, the #906 is the same as the #062 head.”

What kind of cylinder heads do Chevy performance use?

Chevrolet Performance Small Block Chevy Cast Iron Vortec Cylinder Heads. America’s favorite high-performance cast iron small block cylinder heads offer big power and bigger value. Chevrolet Vortec Cylinder Heads’ fast burn combustion chamber and high-velocity ports combine to produce big horsepower.

Which is better HD 906 or 062 cylinder head?

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. They both utilize back-cut exhaust valves.

https://www.youtube.com/watch?v=GjevyMpbJMc