Chrysler 318 and 360 cylinder head built from a MAGNUM casting that has been drilled for a early intake manifold bolt pattern. Retrofitting an LA engine to a Magnum configuration is amazingly straight forward, requiring no special modifications, just the right parts.
Naturally, the Magnum heads are needed, and to attach them to the block, specific Magnum fasteners are needed. Mopar LA small-block heads are attached with 10 bolts each, with four short ones and a long one under the valvecover, while the Magnum bolt set uses five long ones in these positions.
The stock fasteners are available order part number HB318N. The production Magnum head gasket is a unique design, however the changes from the LA series are primarily to corral the pushrods into position during assembly.
Regular LA engine gaskets can be used here. As noted earlier, the major difference with a Magnum package is the valvetrain. Naturally, Magnum specific rockers are need.
The OEM rockers are actually a very good design, suitable for milder street performance applications. With lifter oiling confirmed, the pushrods need to be hollow, with oil passages at the tips to transfer oil up to the rockers. Since all Magnum engines were equipped with tall-body hydraulic roller lifters, the factory pushrods will be too short to work with the lower flat tappet lifters.
Mopar Performance has a pushrod package designed to mate the standard Magnum valvetrain with a hydraulic flat tappet cam. Competition Cams provides pushrods in their retrofit valvetrain kit, PN 1425-KIT, so you are covered there. Any custom pushrod supplier can provide the required length pushrods where modifications require a special length. In fact, once the length is determined, the pushrods can probably be found in most aftermarket cam companies catalog as a stocking part by length listing, since the ball/ball end configuration in an oiling pushrod is the most common type used in the aftermarket.
With the Magnum's vertical intake mounting pattern, a Magnum-specific intake manifold is required. There are those who have gotten around this problem with custom modifications to change the bolt pattern on the Magnum heads, or revising the intake bosses.
There are several good aftermarket choices in Magnum carbureted intakes, making bolt-on manifolds readily available. Mopar Performance has both dual- and single-plane intakes available for the Magnum heads, and Edelbrock has recently introduced their excellent Performer RPM Air Gap for this application.Professional Products has a manifold that has a dual bolt pattern, which fits both Magnum and traditional LA heads. You'll need to get intake manifold gaskets for the Magnum application, to match the revised bolt pattern. Magnum valve covers are needed to work with the Magnum heads, since the number of attachment bolts are doubled for better sealing. OEM valve covers are a decent choice, but for a little more flash, Mopar Performance carries nice cast aluminum covers.
The swap to a Magnum top-end is really a bolt-together deal on an LA engine, which shouldn't be too surprising, since that's the way Mopar essentially did it in the first place. What Makes an EQ Cylinder Head better than the rest?
Highest grade of material used in manufacturing. Thicker decks for greater strength.Superior port finish for increased flow. Improved flow design to resist cracking. Redesigned water flow for greater thermal conductivity. CNC machined guides and seats. 25 point quality check on every head. Assembled heads use OE quality stainless steel valve, springs, retainers, keepers and viton seals. 1.7830-1.8500 (45.288-46.99 MM). 3110.3120 (7.899-7.925 MM). 4.893-4.918 (124.282-124.917 MM). 4.907-4.932 (124.638-125.273 MM).
1.880 (47.752 MM). 1.600 (40.64 MM). 2.000 (50.8 MM). 1.810 (45.974 MM).1.630-1.690 (41.402-42.926 MM). 1.450-1.520 (36.83-38.608 MM).
1.967 (49.962 MM). 1.640 (41.656 MM). Message us if you have any questions on this item.Rate applies to continues 48 states in the United States only. Let us know so that we may improve our listings and service! Every effort has been made to keep our listing error free, and we reserve the right to correct any errors that may occur. Actual product may vary from the picture(s) provided. We do our very best to accurately describe every product. We are not responsible for product changes made by manufactures. WARNING: This Product May Contain Chemicals Known To The State of California to Cause Cancer, And Birth Defects Or Other Reproductive Harm.
Visit the P65Warnings CA GOV website for more information. The item "318 / 360 CHRYSLER MAGNUM ASSEMBLED CYLINDER HEAD EARLY L.BOLT PATTERN pair" is in sale since Wednesday, August 29, 2018. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Cylinder Heads & Parts".
The seller is "aamidwest" and is located in North Las Vegas, Nevada. This item can be shipped to United States.