Chrysler, Dodge, and Plymouth LA 2. V 8 engine and carburetor performance upgradesby Keith Indy. The 3. 18 is a good, solid and dependable engine. Empire Earth Ii By Rahul Gupta. I will be the first to admit and try to sell that. Secondly, the 3. 60 is an outrageously great engine because it has so much potential, greater than a Chevy 3. Ford 3. 025. 0. The SBChevy guys have a little advantage because all the heads and intakes all bolt on without major changes other than combustion chamber and valve sizes. MOPARs have two sizes of runners and various valve sizes. What you have to do is make the determination of what you really want to do. A 3. 18 can be built rather easily using stock components and be very reliable and strong, the 3. About the only things that are different between the two other than the headsintake, are motor mounts right side, actually, harmonic balancer and torque converter being external balance on the 3. The 3. 18 does have the advantage of a steel crank stock, so power and rpm limitations are minimal. If you are on a budget, your best choice is to freshen the 3. There are some differences between the 3. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. Easily share your publications and get. Theory. At the risk of atomizing a little more fuel onto the fire a little carb humor there., lets examine the basic function of a carb. Air flows through the. Number/296068/filename/thermoquad%20idle%20circuit.PNG' alt='Thermoquad Air Valve Tool' title='Thermoquad Air Valve Tool' />It is easier to get raised or decent compression pistons for a 3. Another common thing is there is no replacement for displacement. There is no better source than either the MOPAR Engines or MOPAR Chassis Speed Secrets books available through your nearest dealer. I always advocate that anyone who lacks experience andor technical training and wishes to build up or modify an engine, should talk to engine builders, ask lots of questions and read and learn. Read and talk to a reputable machine shop, talk to MOPAR people at car cruises and swap meets in your area and find out who they recommend in the way of a machine shop and go talk to them about a hi po 3. Find great deals on eBay for mopar air cleaner and mopar air grabber. Shop with confidence. Newsletter. Sign up for the all the latest and greatest updates, discounts and info. First performance enhancement. The first performance enhancement you do on a stock 3. H. P. cam or equivalent. With stock heads, 2. Bbl carb and even 2. Even with 4. 1. 1 gears and street tires, the FIRST 5 feet that the car travels is the most critical. Over carburetion or a non functioning accelerator pump will pretty much have the same effect, the car may indeed fall on its face. You will benefit from a quicker advance curve in the distributor and enough initial lead to give about 3. Carambis Driver Updater Virus'>Carambis Driver Updater Virus. A dist with 1. 3 inside will double to 2. The 3. 60 heads and Intake swap will fit on the 3. The book says the 3. It can be done, but, if you have a 3. Keep in mind that the 3. J heads of the 3. This is going to drop the compression pretty low, which is great for cheap gas, but bad for the performance side, thus most 3. If the engine is out and heads are off, do some measuring to determine what the compression is going to be. Thermoquad Air Valve Tool' title='Thermoquad Air Valve Tool' />Find or Sell any Parts for Your Vehicle in USA. Parts for Sale Add New Used Part Blog Contact Us Add New Used Part. Some of the pistons can be as much as. Terminal City Training Course. I am not trying to squelch your combination, but, as many others have done with similar combinations, if it is a dog, dont be surprised. As stated, the piston sits between. The area of the chamber of a 3. J head is greater. Unless the block was 0 decked to the pistons, aftermarket pistons were limiting the distance below the deck, or the J heads are shaved, measure the compression or it will be lower than stock. Now, there is a solution to this problem. Last months Hotrod mag had an excellent article similar to yours, but the heads were with smaller chambers. They shaved theirs. When removing that much metal from the heads, the cork gaskets front and rear of intake may be too thick, so be cautious during installation of the intake. Here is the thing about the 3. The intake valves are smaller on the 3. The pushrod pinch on the intake port is the same for the 3. Port matching can be done on most castings some are close at the top of the gasket. Here is the hard thing to deal with on the 3. The exhaust valves will be sunk within a couple years because the seats are not hardened and need the leaded gas to survive. Figure you can get approximately 2. Have the 3. 60 heads shaved. Another solution is to hit the junkyards. Performance Upgrades for the Chrysler, Dodge, and Plymouth 318, 273, and 360 engines. Keith Indy. See Rick Ehrenbergs bolton performance tips. Mopar Magazines Index ofUseful Tech Articles Brought to you by the 6171Dodge Truck Website http Last Revised 122298. Mopar Restoration Vendor and parts sources. I had several sets of 3. I have had in 7. 3 7. Plymouth engines. Dont know the casting number but they do exist. Then put the 3. 60 valves in the heads and port them. These heads already have the hardened exhaust seats. Intake valves are not affected. Did it on two sets of heads and have had wonderful results in the power increase world. I originally ordered stock 3. Cut the seats, ported the heads, and really noticed the breathing and torque increase. It was fun You can indeed shave the 3. CR but that should still keep it under 9. The power potential is already there, but everything has to work together the timing, the intake and exhaust flow, the distributor curve, the plugs and wires, the cam specs, the carb itself, and even the typegrade of engine oil to make any 3. The 3. 403. 60 intake is a larger runner than the 3. This is like taking a 34 inch pipe and running it into a 12 inch pipe. They have to be port matched, or, if that cannot be done, find a 3. Streetmaster type dual plane intake. Smog is a concern for some of us, not for others, but there are some things that can be done without too much worry. For starters, we have to remember that the 3. AND larger combustion chambers. The amount of shaving to get them down to the 3. An old favorite, and extremely helpful thing to do is have 1. There is a requirement to tulip the intake port to do this, but the small amount of work is well worth the effort and money. This also prevents having to change out the intake manifold to fit. If you do go with the stock 3. Edelbrock makes a really nice aluminum head, with the smaller chamber size, if they are anything like the big block aluminum heads, would be fantastic, along with headersdual exhaust and a 4 bbl and 6. Go out to the salvage yard and find a set of closed chamber heads. Anything past 1. 97. The closed chamber heads add compression and simplifies the need to shave so much off to raise compression. Get a set of 3. 60 valves 1. Port the heads to gasket size and tulip the bowl to the valve size, but dont just bore the bowl out to the bigger valve. The less you shave the heads, the less likely you will need adjustable rockers. If you cant get a set of heads that are closed chamber, only shave the heads. Get a set from the salvage yard and get them prepped and ready instead of waiting a week with your car down. Port match and bowl work is the best. Do not switch everything over to 3. It really kills your compression and stock ported heads run higher velocity for the 3. You suggested replace the stock 1. Other people recommend this as well. Now I know that the 3. My question is, would the 0. Wouldnt it be easier less expensive to increase the intake flow with a 2. Crane cam Or 1. Id imagine for competition youd want larger valves, but for a daily driver, would the effort machine shop fees be worthwhile And what about increased fuel consumption Im thinking of installing late 8. Has anyone done just this upgrade alone, that could verify performance gain MPG difference I did just this to my 7. Barracuda 3. 18 when the wrong valves were sent to me and I was not in a position to wait for them to be replaced. The difference between 1. Thats one tenth of an inch. Mileage did not decrease, it actually increased because the added efficiency with the small runners breathed better, not worse. I was using the Crane. I could feel the difference from stock and it worked well. It was coupled to a Streetmaster dual plane and Hedman headers, ported heads, balanced stock rods and pistons, and Holley 6. Bay. All Categories. Antiques. Art. Baby. Books. Business Industrial. Cameras Photo. Cell Phones Accessories. Clothing, Shoes Accessories. Coins Paper Money. Collectibles. ComputersTablets Networking. Consumer Electronics. Crafts. Dolls Bears. DVDs Movies. Entertainment Memorabilia. Gift Cards Coupons. Health Beauty. Home Garden. Jewelry Watches. Music. Musical Instruments Gear. Pet Supplies. Pottery Glass. Real Estate. Specialty Services. Sporting Goods. Sports Mem, Cards Fan Shop. Stamps. Toys Hobbies. Travel. Video Games Consoles.