Low on coolant, so i added about a half gallon or so of dexcoolwater. This newly designed cast iron marine and stock replacement head will work on any small block chevy application and is the only head of its. These cast iron vortec cylinder heads will fit 1958 and later small block chevy engines, and offer a 20 to 40 hp increase over earlier cast iron small block heads. Chevrolet performance vortec cylinder heads 19331470.
The steel cylinder liners have a small bore, only 93mm, to help reduce the length of the block, but the stroke is long. Hello well this past fall i purchased some used 062 cylinder heads from a scrap yard with the hopes of switching out the stock heads on my 350 tbi small block. Are these vortec heads cracked beyond usage or repair. This head is complete with brand new valves and springs. This information is somewhat different than previous engines. How i diagnosed a cracked head on my 2005 gmc sierra with a 5. The vortec head out flows the bow tie head out of the box and is a 20 to 40 horsepower bolt on increase over earlier cast iron small block heads. Any cracks or flaws in the cylinder head will cause a disturbance or magnetic flux in the magnetic field.
The special magnetic metallic powder moves right to the damage and lets you define cracks that are not visible to the naked eye. This is not an aftermarket head, it is brand new from gm. Compared to previous gm smallblock cylinder head designs, the vortec bowtie has allnew ports that are taller and narrower, the idea. But when the head is torqued down it could come apart. Now, i see milky colored oilgunk at my oil cap now. This procedure assures the highest quality cast iron cylinder heads. Chevrolet performance sbc cast iron vortec cylinder head. Brazing would add to much heat an cause warping maybe. Have you ever seen a set of cylinder heads cracked like. Features include fast burn combustion chambers, and a highvelocity lt1 port design. The ac will bolt up to the head, but the brace that bolts up from the ac compressor bracket to. We use cookies to give you the best possible experience on our website. Cylinder head, vortec, cast iron, assembled, 64cc chamber, 170cc intake runner, chevy, small block, each more info.
Because of this, it has become a very popular swap. The powder is then drawn to a cracks magnetic field, filling it, and. This is not an aftermarket head, this is a remanufactured gm cylinder head. Go to the passenger side, look at the front of the head and see if you see the casting number 706. You may browse the list of chevrolet cylinder heads below or use the search form below to find the cylinder head for your specific chevrolet vehicle. Cracks in cylinder heads or blocks except in the main bore or web area are often. Plug into any 110 volt ac outlet and simply push the onoff switch down the button stays down so your hands are free. Magnetic particle detection magnaflux is good at finding cracks on block and head deck. The cast iron cylinder head is magnaflux tested by being coated with the iron oxide particles and subjected to a strong magnetic field. Its got a regular hei and 600 holley from a 350 ho deluxe crate engine, cheapo professional products intake, and a set of shorty headers, other than that its stock and has ran 14. Since its introduction in the late 1990s there have been a few versions of the factory vortec head. A head may be cracked because the engine overheated.
Everything wrong with a 1st gen gm sierra silverado vortec. The constant change in temperature causes cracks to form in aluminum heads. They should not be modified for older 12 bolt style intakes because there is not. These polished cylinder heads are pressure tested using magnetic detection to eliminate the chance of cracks or flaws unseen by the human eye. After removing the cylinder head retainers, phillipe mounted our block and. Modifying and test fitting chevy 350 vortec heads for thread in rocker studs.
Trick flow engineers combined the best features of factory gm ls3 and ls7 cylinder heads with trick flows own unique brand of racewinning engineering and technology to create the ultimate square port ls cylinder head for 4. If you do, theres a good chance its a cracked head. After it was cnc ported to optimize air flow, it flowed about 160 cfm. Large port cast iron vortec bare cylinder head 225cc. I dont have any ported numbers on the new heads yet, but i did find the ported numbers from the. How to assess a used engine block and stepbystep machining. Remove the bolt holding the fuel pipe bracket to the rear of the cylinder head.
Oil is vital to maintaining the health of your engine, but if its leaving the areas of the car where its needed it can cause major damage. Vortec l31 cylinder head crankshaft coalition wiki. Of course, i could probably write a book about crack detection. Vortec bowtie cylinder heads come with bigger valves, a thicker deck surface and 66cc combustion chambers. The heads provide outstanding lowlift flow numbers the more air you flow, the more potential power and fast burn performance all in an affordable, castiron head. Why is it important to magnaflux test cylinder heads. Over 90% of the vortecs 275 lbft of torque is available from 1600 rpm to 5600 rpm. This item professional powertrain 2ct7 chevrolet 4. It is highly recommended to check for clearance on anything over. This portable magnetic crack detector goes anywhere to inspect your head or block for cracks. The vortec heads have the 3 bolt holes drilled and tapped on each end of the cylinder heads. I run vortecs on my truck, actually the whole vortec engine from a 96 chevy truck.
Vortec heads tend to crack in the center two cylinders more than the ends. He is a cylinder head specialist and the following numbers and quotes are from him personally from his portingtesting of stock gm 8. Long stroke engines typically provide good low rpm torque and the vortec 4200 is no exception. The iron oxide will gather and react at the points of magnetic flux and become visible under a black. How often do you see cracked cylinder heads or blocks on. The cylinder head along with a gasket reside on top of the engine and. Garage sale speedway portable magnetic crack detector. This is a brand new gm marine cylinder head for all 5. The vortec head outflows the bowtie head out of the box and is a 20 to 40 horsepower bolt on increase over earlier cast iron smallblock heads. Arguably the most dominate cylinder head in motorcycle drag racing, this completely redesigned casting eliminates the limitations of the original vortex formerly mtc cylinder head casting. A magnetic test for cracks on chevy heads with an explanation of the 305 head. The vortec requires a vortec style intake manifold due to its improved manifold mounting flange and gasket design and raised intake ports. Vortec cylinder head for sbc cracked exhaust valve seat. Chevrolet performance vortec cylinder heads 12558060.
Replaces casting numbers 12552520, 125571, 12558059. I fear that i have the dreaded castech head crack issue. Our cylinder heads are assembled using a new valve stem and seals that feature the latest in high temperature technologies increasing heat resistance and longevity. You do not have the required permissions to view the files attached to this post. We have some of the lowest prices on chevrolet performance parts, chevrolet performance engines, and chevrolet performance transmissions. Remove the ground wire bolt and the ground wire from the rear of the cylinder head. Last week i noticed engine temp was bouncing between 210230. Performed 354560degree valve job and 75degree throat cut on. Also, there looks like something hit the top of the chamber between the intakeexhaust valves, like theres a little piece of it missing, though it doesnt. This is a brand new aftermarket marine cylinder head for all 5. I have a chevy 502 water is leaking from top of cylinder head bolt. The name vortec can be confusing because gm used that name for their v6 and v8 truck engines as far back as 1985.
The name vortec can be confusing because gm used that name for. If it were to leak water would be coming out the top of the head bolt if the threads were sealed. The heads feature fully cnc competition ported runners with a premium high resolution surface finish for. Clean the engine block and the cylinder head sealing surfaces. Eventually, we honed in on a 350ci smallblock chevy being sold at a yard in. When performing your own check for cracks, you need a method of testing that does not use expensive equipment and works with a non magnetic metal.
The magnetic method of crack detection is suitable for all of ferrous metals that is used on cast iron cylinder heads. Narrow your results brand american cyl head 9 surefire 10 techhead 5 titan 1 autozone rewards. Chevy vortec cast iron cylinder heads the chevy vortec head is an excellent choice for a variety of performance and race applications. This is a remanufactured gm marine cylinder head for 4. Dry magnetic powder is a fine cast iron dust with dye added to make visual.
Well, i bought a used pair of vortec heads and theres a tiny crack at the edge of the combustion chamber, its just big enough that i can barely hook my finger nail in it. The previous version, in prostock form, used 47mm intake and 39mm exhaust valves. Anything i should know about installing vortec heads. Because the cracks can be very small, using a magnetic particle. Chevrolet automotive cylinder heads clearwater florida. Holes in your head or the fine art of crack detection goodson. Magnetic particle inspection is the most definitive method of detecting cracks and imperfections in any ferrous engine parts. Visit our whats new page to get all the latest chevrolet performance news, announcements, and specials. Gm is now recommending a torque turn method of tightening the cylinder head for this engine. Cracking causes the head to lose pressure, resulting in lost power for your vehicle. How often do you see cracked cylinder heads or blocks on the chevy 3.
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