The block is much lighter without all the motor-mount bosses. As you begin building your foundation, use a notebook to keep track of everything that you see and do, from casting numbers to bore sizes, etc. We are told that little problem has since been corrected. Sleeving is the only way to accomplish this bore size. You may be able to use solid roller lifters with the 59º angles in these blocks but it would take considerable grinding.
The vertical outer bolts break through in the standard casting. Honing plates should always be used when boring and honing the cylinder block. This eliminates the windage created by the return oil. Since the 340 carb was a 4 barrel, it was wider and the carb linkages caused interference with the spark plug wires, so they raised the drivers side wire holder up about 2. Due to the large variety of Mopar internal engine parts we offer, we have other pages on our website specifically devoted to Mopar Pistons, Mopar Connecting Rods, Mopar Crankshafts and small block Mopar intake manifolds.
P5249769 W2 Cast Iron Race Cylinder Head — 2. The aluminum block uses steel main caps, and the center three are cross-bolted. Office Address: AutoWise, 809 N 30th St. On Magnum engines, the oil goes to the head and rockers through the pushrods from each tappet. This engine never saw the light of the day on the street, but was used in multiple racing venues, and was a modified production 340 block.
Ideal replacement for stock pump in high performance applications. You can overbore the resto block to 4. I pulled out to pass a slow guy going about 40 on my way to work. If you scattered the original engine you may have received a standard 340 replacement block. The bore walls of adjacent cylinders are joined solid. On the number-1, -2, and -4 caps cap on right , there is no relief for the thrust bearing flanges. Each center cap number-2, -3, and -4 is cross-bolted similar to the 426 Hemi in Top Fuel.
The standard four-bolt small-block head bolt pattern sits around each bore with the added top and bottom bolts showing the six-bolt race pattern. Then, from the mains, the oil goes to the camshaft bearing. All told, the engine has a powerband of 3,600 to 8,500 rpm and idles at 850 rpm, which is incredible. High- Performance Valve Springs — up to. The main reason for splayed outer bolts is to put the bolt into solid material.
The main bulkheads must have enough material and strength to support four-bolt caps with vertical outers. Later versions had the regulator and filter mounted at the in-tank pump. The three bolts are spaced around the right core plug: one to the bottom, one to the upper left, and one to the upper right, both just below the pan rail. The two larger holes above the cam retainer attaching bolt holes are vents from the tappet chamber to the front cover. Early 340 blocks can be overbored about. Please click on the below text links to go directly to more info on these parts. The crank flange is below this surface and not part of the cap.
This feature was added to all R-blocks. The aluminum block does not use either style of motor mounts and is designed for use with motor plates. These engine components affect ultimate power, reliability and longevity. Eight blade pump is recommended for use with aluminum cylinder heads and circle track applications. Once the block is disassembled or the new block is obtained, it is usually mounted to the engine stand. Designed to upgrade the P4120098 cast aluminum rocker stands, these units will not flex,crack or crush.
The cast numbers on the caps are fuzzy and difficult to read. Extra width allows for larger valve springs and longer rocker arms. You can also practice the gear install. In some cases you must use a small mirror to see if this is true. Share Your 340 High Performance Modifications How have you built up your High Performance 340 Engine? They are rough machined and then installed onto the block for final machining. The rear intake gasket seal is just ahead of this surface. You can identify them easily by quickly looking at the core plugs located in the sides of the blocks.
Starting in the 2004 model year it was entirely withdrawn from production and replaced with the 3. Big-Block Performance From a New Small-Block Package What do you call a small-block 340 that can develop 602 hp at 7,000 rpm on 91-octane go-go juice? If you are using 10 bolt heads, the areas circled in red in the photo below can be milled off and our hydraulic roller lifter set 5321 or solid roller lifter set 5323 can be used in this block. The difference comes in oiling the head and valvetrain. The number-3 cap on the left has the front and rear faces machined to accept the flanged thrust bearing. The debut year of the 340 produces 275 horsepower at 5,000 rpm and 340 ft. For use on all cylinder heads with cast-in rocker stands. The engine gained 5 pound-feet of torque in the 1973 model year; that would be its last performance.
It is very important that each oil hole line up with the hole in the block. The 340 resto block, by Mopar Performance, is more readily available. The core plugs are the two at the bottom; one is on the right while the other is on the left. As the open loads went past 500 pounds, the friction went up and the racers wanted to use 50-mm roller cam bearings. The foundry uses sonic testing to help find any broken or damaged core blocks and keep them from getting into the machining process. If you are building many engines, buy a high-quality sonic tester; otherwise have your machine shop sonically test the block.