with Jeff Smith: How Much Power Can I Make By Adding Ported Vortec Heads to My SBC Engine? Note: K Motion K-700 springs have been reported by one member of Hotrodders.com to be breakage prone. The most popular thread size for domestic plugs is 14 mm, although a few older Ford engines used the larger 18mm size back in the '60s. In 1969, any Chevy vehicle could be ordered with a 350 engine. How much of a horsepower gain could you expect from porting these heads using the cam and everything? Edelbrock Universal Throttle Bracket. Same as P/N 12558060 except it doesn’t include intake valves, springs, and retainers. They have pushed-in rocker arm studs which could be pinned or drilled and tapped for 3/8-inch studs. Note: Hardened pushrods must be used with guide plates to prevent excessive wear. Torque sequence for big block aluminum heads This is an excerpt from Part 4. This can be a good way to get heads. Because the cracks can be very small, using a magnetic particle inspection system will show defects not readily visible to the naked eye. AC Delco Rapid Fire Spark Plugs R44LTS; AC Delco Rapid Fire Spark Plugs MR43LTS But like the L31, if you’re going for a big cam, they'll need at least better springs. One additional point with Vortec heads is they take a special-length reach spark plug. These are the combustion chambers of the Vortec iron head (PN 12558060). To get to the compression ratio need to start with the cam, the point where it seats the intake is all important as at that point the piston has risen in the bore and pushed inducted mixture back out. Spark Plug Torque. Head gaskets leaking or a cracked casting that lets coolant into the combustion chamber will make the plugs look a lot different than a normal plug- look for uniformity. Spark plugs for the 350 engine are on the sides of the engine, outside the cylinder heads. If a guide plate is used, add the thickness of the guide plate, the hex, and the stud radius together to reach the amount that has to be removed. The plugs I bought per the head dealer were Autolite AR3924. Don’t know which spark plug to choose, ask me. If it was leaking there's too big of a chance it overheated and cracked the heads. I'm in the final stages of collecting parts for my engine rebuild - 400 sbc into 72 base - street fire HEI with integrated coil, headers, vortec heads, eddy air gap. reach - equals depth of threads in the head hex size - 5/8 or 13/16" you want a solid terminal resistor for street use heat range - get a recommendation from Jason gap - you can leave that blank and it will bring up all plugs that meet your other criteria and will list their gaps or you can plug in .035, .040 or .043 (whichever you decide on) Paired with a decent cooling system, the Vortec heads will be as dependable as any cast iron head that came before it and will increase the over-all performance of your engine. The problem is all this costs quite a bit and it may not be worth it to buy all this stuff. ACDelco 41-993 Professional Iridium Spark Plug (Pack of 4) Iridium better engine idle stability and … Either of these can be built for less than a grand. EQUIPPED WITH SPRINGS FOR USE IN MECHANICAL FLAT TAPPET AND HYDRAULIC ROLLER CAMSHAFT APPLICATIONS; Match with Edelbrock head gasket sets. The spring rate for this spring is 409 lb/in and has a 0.870" ID. Fel-Pro Head Gasket, 0.015” thick compressed. The stock springs are not suited for high performance use or for lifts above about 0.460" using stock retainers. I need a 14mm thread 3/4 (or 750) reach with a 5/8" hex. drilling straight, correctly located holes and tapping them, this is better left to a professional machinist/machine shop. And what kind of tools will I need to do this properly? Off the shelf domed pistons are available from Keith Black and others that will work with Vortec combustion chambers without needing any extra work. I will stand up for the NGK (5464) BKR5EIX-11 one. Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach … Because of the superior port and combustion chamber designs, total timing requirements for maximum power is 30-32 degrees BTDC, or about 4-6 degrees less than the earlier non fast burn heads. The original answer was related to modifying the heads to accept more valve lift. Along with that, the guide boss OD can be machined down from 0.852" to a smaller common diameter, like 0.785" of the original Gen1 SBC heads, so aftermarket springs (double or with dampers) can be used. This site uses Akismet to reduce spam. Just click the "edit" tab at the top of this page, or click one of the  links to the right of an article section. Make sure the spark plug is not too short. • A new spark plug has been released for use in the above vehicles. Part Number: NGK-5113 Not Yet Reviewed One such example is the large port Bow Tie Vortec head; it can only be milled to about 51 cc. Patterned from the design of the LT1 cylinder heads from the 1992-96 Corvette, the Vortec iron heads were first used on the fuel injected 1996 pickup truck RP0 Code L31. The pressed studs can be pinned, but this is a stop-gap measure that should be done only in cases where the spring pressures/engine RPM/lobe intensity will not be excessive and/or the budget is limited. A spark plug’s reach is defined as the length of the threads. This is a sure sign of a blown head gasket, bad intake gasket or cracked casting, any of which can lead to overheating and cracked heads. NGK Spark Plugs (U.S.A.), Inc. 46929 Magellan Drive Wixom, MI 48393. tel: 248-926-6900 fax: 248-926-6912. The Vortec head gains more of a kidney bean shape, increasing quench, and has had some attention paid to the swirl characteristics of the incoming charge. Don’t be fooled, these heads are much different from the early large chamber heads even though they may have similar volumes. 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