318 Pistons Dodge Plymouth Chrysler Mopar 5.2L Magnum Piston Sets

The 318 Mopar V8, also known as the 5.2L, and 5.2 Magnum has been around since 1964 as part of the LA engine series and the 1992 and newer Magnum series. We offer a wide range of pistons for the Mopar 318 engines. The 318 is a dependable, reasonably small and light, efficient engine package, that can be built to do everything from power a street work truck to being an all out drag, oval track or road racing engine. Many people tend to overlook the 318 as a high performance engine, which is a shame as it offers many benefits, and the core engines are easy to come by and relatively inexpensive.

In building up a 318, one of the main things that must be changed is the pistons. From the factory, the 318 was just about always equipped with low compression pistons, as it was intended more for long life than for high power output. Installing higher compression, higher quality pistons is one of the biggest improvements you can make to your 318 engine.

We offer a wide range of replacement pistons for the Dodge, Chrysler, Plymouth 318 engines. We have everything from stock replacement pistons, to custom 318 forged racing pistons, and quite a bit in between. The 318 and 5.2L Magnum piston listings on this page include stock type replacements at the top of the page, and as you work towards the bottom of the page you will find the all out racing forged type pistons.

Sealed Power Mopar 318 Cast Stock Replacement Piston Sets

We offer better than original, stock replacement 318 pistons from Sealed Power. These pistons are great for stock rebuilds, muscle car restorations, and even light duty performance applications. These pistons are a cast piston, which is the type originally used in these engines from the factory. The Sealed Power Piston sets we have are based on the original designs, but with improvements due to modern manufacturing techniques ensuring a better piston, at a great price. The piston sets are weight matched before packaging by Sealed Power. The pistons come with a selectively fit piston pin. We also offer the matching sealed power piston rings for all of these piston sets.

All of these pistons use ring groove widths of 5/64, 5/64, 3/16. The compression height, ch, of each piston is listed in the description column.

We are working to get all of these pistons entered into our online shopping cart system. Until that is completed, please e-mail us for information and pricing on any of these piston sets and piston ring sets.

We also have Speed Pro hypereutectic and forged pistons for many Mopar V8 engines. You may view them on our website by clicking here: Speed Pro pistons for Mopar V8 engines

Please click on the part numbers in the table below for pricing or to order pistons and or piston ring sets.

TRW Speed Pro 318 Forged Pistons

TRW forged piston sets and Speed Pro forged pistons are available for the 318 Mopar engine. All of the Speed Pro and TRW piston sets listed below come as a complete set of 8 pistons and they include the piston pins, and pin locks with the floating pin type pistons. Many of these pistons include low friction skirt coatings also. The piston sets are all weight matched before packaging. TRW forged pistons set the standard for years with their line of forged replacement pistons for stock type engines. Speed Pro forged pistons further that tradition with their line of Powerforged piston sets.

Speed Pro and TRW forged and hypereutectic pistons are great for use in high performance cars and trucks, street strip vehicles, race cars, hot rods, street rods or anywhere a stronger, better performing than stock piston is required.

Part numbers in the below charts with a H as the first digit are hypereutectic pistons, if the first digit is a L they are are forged pistons. Under Pin Type, P indicates the piston will work with a press pin type connecting rod, F means the piston will work with a floating pin connecting rod. If you see P or F it means the piston can be used with either type of connecting rod. FT under the top shape column means Flat Top piston, if it also has valve reliefs the number of reliefs will be listed also.

Ring Groove Width A 5/64 beside the part number in the ring groove width column indicates that the piston uses a ring package of 5/64, 5/64, 3/16. A 1/16 in the ring groove width column indicates that the piston uses a ring package of 1/16, 1/16, 3/16.

If you are looking for stock type cast Mopar pistons, you may view them by clicking here: Sealed Power Mopar cast pistons

Speed Pro TRW Forged Piston Set for Mopar 318 and 5.2 L Magnum Engines

Click on the part number in the charts below for pricing and ordering info.

Keith Black KB forged 318 Piston sets are available in flat top, dish top and dome top designs, for stock 318 stroke engines and 318 390 stroker engines.
All of the sets listed below feature:

Wrist pins and pin fitting included
Accumulator groove included
Double pin oilers are force fed from the oil ring
Large valve relief depths and diameters allow for high lift cams and oversized valves
Piston sets are balanced to +/- 1 gram
Pin lock grooves included to ease lock removal
Fully CNC Machined
Double spiral locks included

Click on the part number in the table below for pricing or to order the pistons and or rings of your choice.

Small Block Mopar Pistons 318 340 360 390 408 Mopar Diamond Racing Pistons

Diamond pistons are available for a wide range of small block Mopar engines, bore sizes, and strokes. Diamond Racing Mopar pistons are all high strength forged pistons. They offer high strength, but at the same time modern technology allows these pistons to be light weight improving engine performance further. These pistons are far superior to any cast or hypereutectic type piston. Small block Mopar Diamond piston sets offer reduced friction, better ring sealing, faster acceleration, more horsepower and torque in your high performance street, strip or race car engine. We are pleased to offer the entire line of Diamond Pistons to our customers at great discount pricing.

Mopar 318, 340, 360, 5.2 Magnum, 5.9 Magnum Diamond Pistons

The Diamond forged pistons listed below, for the 318 engine, are for use with 4" stroker crankshafts. At .030 oversize, the 318 with the 4" stroker crank builds a 390 cubic inch engine.
If you are using a stock stroke crankshaft in your engine project, you will need to select pistons to work with the stock stroke. If you are building a stroker engine using a 4" stroke crankshaft, then you will want to choose the matching 4" stroker pistons. We also have the 4" stroker cranks available as well as rotating assemblies or stroker kits.

If you have any questions about these Diamond Mopar pistons, please e-mail us and we will be happy to help.

All Diamond small block Mopar street, strip dish top pistons feature the following:

Designed to fit most Mopar OEM open and closed chamber heads
Will work with aftermarket Edelbrock and Indy heads
Designed for forced induction applications, turbo charged or super charged
Standard 1/16 - 1/16 - 3/16 ring package
Premium 8620 wrist pins included and pin locks included
Valve relief cut for maximum valve diameters of 2.070" intake and 1.625" exhaust

Small Block Mopar 318 5.2L Magnum Stroker Pistons Dish Top

These 318 pistons are for use with a 4" stroker crank, they are not for use with a stock stroke 318 crank.
Click on the part number in the table below for pricing or to order using our secure online shopping cart system.

Diamond Mopar Small Block Piston Set Features

All Diamond Racing pistons for small block Mopar street, strip flat top piston sets feature the following:

Designed to fit most Mopar OEM open and closed chamber heads
Will work with aftermarket Edelbrock and Indy heads
May be used with small nitrous kits
Standard 1/16 - 1/16 - 3/16 ring package
Premium 8620 wrist pins and pin locks included
Valve relief cut for maximum valve diameters of 2.070" intake and 1.625" exhaust

Small Block Mopar 318 5.2L Magnum Stroker Pistons Flat Top

These 318 stroker pistons are for use with a 4" stroker crank, they are not for use with a stock stroke 318 crank.
Click on the part number in the tables below for pricing or to order using our secure online shopping cart system.

Links to related sections of our website:

CP Pistons Index Page
Pistons Index page for all brand names
Connecting Rods
Crankshafts