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Icon
Premium Forged Pistons

Pontiac

Pontiac 400--------6.630 Rod
2618 Alloy, 4.126 Bore, .9805 Pin, 4.250 Stroke, 1.750 Comp Height, 10.625 Deck Height
Part #
Dome Vol
Comp Ratio
Piston Type
Ring Pack
Notes
14cc 2V
71-9.9, 87-8.6, 96-8.0, 111-7.2
D-Cup
2-1/16, 1-3/16
Centered pin. Use with stock
or Edelbrock style heads.
4.5cc 2V
71-10.9, 87-9.3, 96-8.6, 111-7.7
Flat Top
2-1/16, 1-3/16
Centered pin. Use with stock
or Edelbrock style heads.
Pontiac 428--------6.630 Rod
2618 Alloy, 4.120 Bore, .9805 Pin, 4.000 Stroke, 1.595 Comp Height, 10.250 Deck Height
Part #
Dome Vol
Comp Ratio
Piston Type
Ring Pack
Notes
10cc 2V
71-10.9, 87-9.4, 96-8.7, 111-7.8
D-Cup
2-1/16, 1-3/16
Centered pin. Use with stock
or Edelbrock style heads.
Pontiac 440--------6.800 Rod
2618 Alloy, 4.125 Bore, .9898 Pin, 4.000 Stroke, 1.425 Comp Height, 10.250 Deck Height
Part #
Dome Vol
Comp Ratio
Piston Type
Ring Pack
Notes
4.3cc 2V
72-11.4, 87-9.9
Flat Top
2-1/16, 1-3/16
Centered pin. Use with aftermarket
rods with .990 pin bores. Pistons major axis is based on 4.125 bore. Made with Pontiac 400 block.
Pontiac 455--------6.630 Rod
2618 Alloy, 4.150 Bore, .9805 Pin, 4.150 Stroke, 1.490 Comp Height, 10.250 Deck Height
Part #
Dome Vol
Comp Ratio
Piston Type
Ring Pack
Notes
15cc 2V
71-11.0, 87-9.5, 96-8.9, 111-8.0
D-Cup
2-1/16, 1-3/16
Centered pin. Use with stock
or Edelbrock style heads.
5.5cc 2V
71-12.1, 87-10.3, 96-9.6, 111-8.5
Flat Top
2-1/16, 1-3/16
Centered pin. Use with stock
or Edelbrock style heads.
Pontiac 468--------6.800 Rod
2618 Alloy, 4.125 Bore, .9898 Pin, 4.250 Stroke, 1.300 Comp Height, 10.250 Deck Height
Part #
Dome Vol
Comp Ratio
Piston Type
Ring Pack
Notes
10.6cc 2V
72-11.4, 87-9.9
Dish Top
2-1/16, 1-3/16
Centered pin. Includes spacer
ring. Use with aftermarket rods with
.990 pin bores. Pistons major axis is
based on 4.125 bore. Made with Pontiac 400 block.
4.3cc 2V
72-12.2, 87-10.4
Flat Top
2-1/16, 1-3/16
Centered pin. Includes spacer
ring. Use with aftermarket rods with
.990 pin bores. Pistons major axis is
based on 4.125 bore. Made with Pontiac 400 block.
Pontiac 495--------6.700 Rod
2618 Alloy, 4.125 Bore, .9898 Pin, 4.500 Stroke, 1.275 Comp Height, 10.250 Deck Height
Part #
Dome Vol
Comp Ratio
Piston Type
Ring Pack
Notes
16.8cc 2V
72-11.3, 87-9.9
Dish Top
2-1/16, 1-3/16
Centered pin. Includes spacer
ring. Use with aftermarket rods with
.990 pin bores. Pistons major axis is
based on 4.125 bore. Made with Pontiac 400 block.
4.3cc 2V
72-12.9, 87-10.9
Flat Top
2-1/16, 1-3/16
Centered pin. Includes spacer
ring. Use with aftermarket rods with
.990 pin bores. Pistons major axis is
based on 4.125 bore. Made with Pontiac 400 block.

 

PREMIUM FORGED FEATURES:

Fully machined head and valve ports.
Advanced accumulator and mini groove technology.
Drilled oil returns.
Diamond finished skirts.
Drilled or broached pin holes.
Spiral lock lockrings.
Made from industry's highest quality extruded aluminum billet.

United Engine relocated to Carson City, Nevada in 1978, where it has continued to grow. Since it's move, United Engine has continued to look at it's role in the domestic and world market. Currently, UEM manufactures the Silvolite OE aftermarket piston line, KB Performance Pistons (including the motorcycle division), and The Claimer Performance Piston Series. United Engine and Machine Company is now enjoying more than 80 years in business.

When you examine a piston you rarely examine the bottom of the ring groove. Even if you looked at the grooves of the same style pistons, seeing a difference without a micrometer would be difficult. From manufacturer to manufacturer, however, there can be differences in what is called the root groove diameter. The main difference is in what is called compensated ring grooves. What is compensated ring groove? Basically the root groove diameter is moved with the oversize. For years manufacturers would supply the STD root groove diameter for all oversizes. A .060 oversize piston would have the STD root groove diameter. A compensated ring groove means the root groove diameter would move with the oversize. A .060 oversize piston has the root groove moved out .060. In addition, the ring manufacturers compensate each oversize to match the piston, so there is no need to worry about matching rings and pistons.By compensating the ring grooves it cuts down the space between the back of the groove and the ring. This cuts down on un-burnt fuel stored in this area. In addition, compensated ring grooves make the land stronger, help rings to seat sooner, and allow the top rim of the piston to run cooler.

All KB pistons are supplied with compensated ring grooves.

We have a complete line of racing pistons and rings for import and more from wiseco,probe,srp,trw,venolia,mahle,ross, speed pro, silvolite and keith black.

Call 1-877-354-3812
to order your Parts Today!

Contact us Via Email

About RPM Machine | Specials | Newsletter
RPM Machine-Performance Auto Parts
PO Box 281
Cedar Valley, Utah 84013
We carry parts from scat, je, wiseco, ross, crower, callies, eagle, cat, eagle
Most of our rotating assemblies include forged pistons
and 4340 steelcranks

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