318 Pistons Mopar Dodge 318 5.2 Pistons 318 5.2L 390 Stroker Pistons

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, using low octane regular gasoline, than for high power output. Installing higher compression, higher quality pistons is one of the biggest improvements you can make to your 318 engine. A stroker crankshaft is another item that really brings the 318 to life as it greatly increases torque and power. The 4 inch stroker crank builds a .030 oversize 318 into a 390 and the increase in performance is dramatic.

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, stroker pistons and quite a bit in between. The 318 and 5.2L Magnum piston listings on this page include high performance and racing forged pistons at the top of the page, and stock type replacements at the bottom of the page.

If you are looking for a complete 318 stroker kit they are on our site here: 318 Stroker Kits

Wiseco Pistons 318 A engine & 5.2 Magnum Mopar Forged Pistons

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:

318 Forged KB Pistons Mopar Chrysler Plymouth Dodge 318 and 5.2 Magnum Piston Sets and 390 Stroker Pistons

Stock 318 bore size is 3.910" Stock 318 stroke is 3.310"
Ring grooves are 1/16", 1/16", 3/16"
Compression based on block with a deck cut .010" and .039" compressed head gasket
The 4.000" stroker crankshaft builds a 318 into a 390 cube engine at .030 oversize
FT = Flat Top DM = Dome Top Dish = Dish Top
CH = Compression Height This is the measurement from the centerline of the piston pin bore to the top flat part of the piston
Wt= Piston design weight in grams These are forged pistons, forged out of 2618 aluminum alloy Piston set includes lock rings

Part #

Bore Size

Crank Stroke

Rod Length

Pin Size

Wt. in gms

ccs

piston type

CR w/head chamber of:

Price

60cc

68cc

kb844-30

3.940 +.030"

stock 3.310"

6.123"

.984"

1.810

492

-4.73

10.1-1

9.2-1

~~$428.4~~ $394.13

kb844-40

3.950 +.040"

stock 3.310"

6.123"

.984"

1.810

492

-4.73

10.1-1

9.2-1

~~$428.4~~ $394.13

kb844-60

3.970 +.060"

stock 3.310"

6.123"

.984"

1.810

492

-4.73

10.1-1

9.2-1

~~$428.4~~ $394.13

kb845-30

3.940 +.030"

stock 3.310"

6.123"

.984"

1.810

525

4.9

11.5-1

10.3-1

~~$428.4~~ $394.13

kb845-40

3.950 +.040"

stock 3.310"

6.123"

.984"

1.810

525

4.9

11.5-1

10.3-1

~~$428.4~~ $394.13

kb845-60

3.970 +.060"

stock 3.310"

6.123"

.984"

1.810

525

4.9

11.5-1

10.3-1

~~$428.4~~ $394.13

The 318 STROKER PISTONS listed below are for use with a 4.00" stroker crankshaft

Click here for our 318 Stroker crank page

kb847-30

3.940 +.030"

stroker 4.000"

6.123"

.984"

1.465

439

-23

Dish

9.8-1

9.1-1

~~$428.4~~ $394.13

kb847-40

3.950 +.040"

stroker 4.000"

6.123"

.984"

1.465

439

-23

Dish

9.8-1

9.1-1

~~$428.4~~ $394.13

kb847-60

3.970 +.060"

stroker 4.000"

6.123"

.984"

1.465

439

-23

Dish

9.8-1

9.1-1

~~$428.4~~ $394.13

kb846-30

3.940 +.030"

stroker 4.000"

6.123"

.984"

1.465

439

-4.7

12-1

11-1

~~$428.4~~ $394.13

kb846-40

3.950 +.040"

stroker 4.000"

6.123"

.984"

1.465

439

-4.7

12-1

11-1

~~$428.4~~ $394.13

kb846-60

3.970 +.060"

stroker 4.000"

6.123"

.984"

1.465

439

-4.7

12-1

11-1

~~$428.4~~ $394.13

Small Block Mopar Forged Pistons 5.2 318 390 Mopar Diamond Stroker 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 Dodge Chrysler 318, 5.2 Magnum, 390 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 connecting rods, rotating assemblies and stroker kits.

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

Small Block Mopar 318 5.2L Magnum Stroker Pistons Dish Top

Diamond Mopar Small Block Piston Set Features

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

Small Block Mopar 318 5.2L Magnum Stroker Pistons Flat Top

Sealed Power Mopar 318 and 5.2 Magnum Stock Replacement Pistons

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.

5.2 Magnum 318 Dodge Plymouth Chrysler Mopar Sealed Power Cast 318 Piston Sets

Stock Bore size for the 318 and 5.2L Magnum is 3.910"

All pistons listed use the stock OEM Piston pin size of .984 dia.

Part numbers listed below are for a set of 8 pistons with piston pins

CH = Compression Height

Piston Set Part #

Cylinder Bore Size

Matching Premium Moly Piston Ring Set Part #

Description and Application notes

ch = compression height

Price

Sealed Power H814CP std

3.910 standard stock size

E642K

Stock type OEM replacement piston for 1992 - 2003 5.2 Magnum Truck Engines Hypereutectic Flat Top Piston w/ coated skirts, ring grooves 5/64, 5/64, 5/32, 1.755 CH

~~$315.17~~ $226.92

Sealed Power H814CP-20

3.930 .020 oversize

E642K-20

Stock type OEM replacement piston for 1992 - 2003 5.2 Magnum Truck Engines Hypereutectic Flat Top Piston w/ coated skirts, ring grooves 5/64, 5/64, 5/32, 1.755 CH

~~$315.17~~ $226.92

Sealed Power H814CP-30

3.940 .030 oversize

E642K-30

Stock type OEM replacement piston for 1992 - 2003 5.2 Magnum Truck Engines Hypereutectic Flat Top Piston w/ coated skirts, ring grooves 5/64, 5/64, 5/32, 1.755 CH

~~$315.17~~ $226.92

Sealed Power H814CP-40

3.950 .040 oversize

E642K-40

Stock type OEM replacement piston for 1992 - 2003 5.2 Magnum Truck Engines Hypereutectic Flat Top Piston w/ coated skirts, ring grooves 5/64, 5/64, 5/32, 1.755 CH

~~$315.17~~ $226.92

Sealed Power H814CP-60

3.970 .060 oversize

E642K-60

Stock type OEM replacement piston for 1992 - 2003 5.2 Magnum Truck Engines Hypereutectic Flat Top Piston w/ coated skirts, ring grooves 5/64, 5/64, 5/32, 1.755 CH

~~$315.17~~ $226.92

Sealed Power 285NCP-30

3.940 + .030 oversize

E178K-30

5/64 5/64 3/16

8.5-1 compression, Flat head w/ 4 valve reliefs, use with press pin or floating pin connecting rods, DurOshield skirt coated piston set, ch=1.720"

~~$254.69~~ $183.38

Sealed Power 526AP

3.910 standard stock size

E178K

5/64 5/64 3/16