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Pontiac 400 Pistons by Icon

Icon Pontiac Pistons

Pontiac 400 Forged Pistons

High performance Pontiac 400 pistons are premium quality forged pistons that are available at a price that does not break the bank.We have these Icon brand Pontiac 400 forged piston sets available in a wide range of sizes including standard bore and many popular oversizes. If you are building a 400 Pontiac engine and are looking for improved acceleration, efficiency and strength then these pistons are the perfect choice for many applications.

These pistons can be used in high performance street cars, muscle car restorations, serious street and strip cars as well as dedicated racing engines. The large variety of piston sizes, styles and compression ratios enables you to get the best specifications pistons for your exact application.

Pontiac 400 Engine Specs

For reference the original stock 400 Pontiac engine specifications were:

  • Engine block deck height 10.250 inches
  • Cylinder bore standard size 4.120 inches
  • Crankshaft stock stroke 3.750
  • Connecting rod length 6.630 inches
  • Wrist pin diameter .980

Icon Pontiac 400-V8 Forged Pistons 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
  • Piston tops are polished and the quench area finished to promote maximum combustion efficiency for more complete fuel burn, providing maximum power
  • Piston to valve clearances designed with input from performance engine builders to provide maximum compression and performance
  • Precision wrist pin hole diameter and finish to provide superior pin lubrication at higher RPM’s
  • Unique skirt designs provide reduced friction while maintaining piston stability in the cylinder
  • Icon Premium series forged pistons are made from ultra heavy duty 2618 alloy. FHR series are 4032 Alloy.

Icon 400 Pontiac Pistons

  • Stroke These pistons are for use with a 3.750 inch stroke crank, OEM or aftermarket
  • Connecting Rod Length 6.630 inch
  • Wrist Pin Size .980 x 3.000 inch diameter
  • Ring grooves are * see notes
  • 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 weight in grams followed by wrist pin weight in grams
  • ccs displacement of dome, or dish, and valve reliefs, measured in ccs
  • CR Compression ratio estimates based on a .030 oversize, -.041 deck clearance and .020 compressed head gasket
  • Bore Size Finished cylinder bore size, in inches, that piston is designed for

What is Included?

  • Piston set includes 8 pistons, 8 wrist pins and locks
  • Piston and ring kit includes 1 Complete engine piston set and 1 piston ring set

Pontiac 400 Flat Top Pistons

Pontiac 400 Pistons IC9946

IC9946

NOTES:* FHR Series 4032 Alloy, Ring grooves are 5/64 5/64 3/16. Offset pin. Will work with 14 and 20 degree heads.

CH Wt ccs CR with head chamber of: Bore Size Piston Set Piston and Ring Kit
72cc 87cc 96cc
1.714 563 / 149 -10.8 10.1 8.8 8.2 4.120 standard IC9946
$0.00
Contact us for availability!
IC9946 KTM

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4.140 + .020 over IC9946 20
$0.00
Contact us for availability!
IC9946 KTM20
$0.00
Contact us for availability!
4.150 + .030 over IC9946 30
$0.00
Contact us for availability!
IC9946 KTM30

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4.180 + .060 over IC9946 60
$0.00
Contact us for availability!
IC9946 KTM60

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Pontiac 400 Dish Top Pistons

Pontiac 400 Forged Pistons IC891

IC891

NOTES:* 2618 Alloy, Ring Grooves are 1/16 1/16 3/16. Centered pin. Use original equipment or Edelbrock Style Heads. Some stock rods may need to be narrowed and balance pad removed.

CH Wt ccs

CR with head chamber of:

Bore Size Piston Set Piston and Ring Kit
71cc 87cc 96cc
1.720 574 / 149 -14 9.9 8.6 8.0 4.120 standard IC891
$0.00
Contact us for availability!
IC891 KTD

Add To Cart
4.150 + .030 over IC891 30
$0.00
Contact us for availability!
IC891 KTD30

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4.160 + .040 over IC891 40
$0.00
Contact us for availability!
IC891 KTD40

Add To Cart
4.180 + .060 over IC891 60
$0.00
Contact us for availability!
IC891 KTD60

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Flat Top Pontiac 400 Forged Pistons
400 Pontiac Pistons IC890

IC890

NOTES:* 2618 Alloy, Ring Grooves are 1/16 1/16 3/16. Centered pin. Use original equipment or Edelbrock Style Heads. Some stock rods may need to be narrowed and balance pad removed.

CH Wt ccs CR with head chamber of: Bore Size Piston Set Piston and Ring Kit
71cc 87cc 96cc
1.720 558 / 149 -4.5 10.9 9.3 8.6 4.150 + .030 over IC890 30
$0.00
Contact us for availability!
IC890 KTD30

Add To Cart
4.160 + .040 over IC890 40
$0.00
Contact us for availability!
IC890 KTD40

Add To Cart
4.180 + .060 over IC890 60
$0.00
Contact us for availability!
IC890 KTD60

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Pontiac 400 Connecting Rods

While you are replacing your engine pistons it is a good time to also upgrade your rotating assembly by installing modern connecting rods. Why risk damage to your freshly rebuilt performance engine by installing used connecting rods that have been through who knows how many engine cycles and stress.

With the high cost of machine shop service these days you can often upgrade to far stronger modern rods for not much more than the cost of reconditioning a set of use rods.

Molnar Technologies H Beam Pontiac 400 Connecting Rods

Pontiac 400 connecting rods

Molnar Technologies H Beam rods are machined from billet 4340 steel, and then heat treated to provide improved strength. To make the rods even stronger, they are shot peened to which also increases fatigue life. All Molnar connecting rods are fitted with highly durable premium bronze bushings for use with floating pin type pistons. Each rod set includes ARP fasteners, moly lubricant and installation guidelines.

All Molnar rods are finished in the United States at the Molnar Technologies shop in Michigan. Critical rod dimensions are are held to very precise tolerances of +/- .0001 of an inch, which is the tightest tolerance you will find in the performance and racing aftermarket.

  • Description and Length Engine model that rod is made to for and length of the rod, as measured center to center, in inches.
  • Weight Weight in grams, of one complete connecting rod assembly
  • Bolt Size Bolt dimensions in inches, Rods come with special Molnar Technologies proprietary design ARP2000 fasteners installed
  • Rod Pin Size Crank rod journal diameter
  • Pin Size Piston pin diameter, in inches
  • BE Width Width of the crankshaft end of one rod
  • PE Width Width of the piston end of one rod
  • Part Number Molnar Technologies rod set part number. Set includes 8 connecting rods
Description and Length Weight Bolt Size Rod Pin Size Pin Size BE Width PE Width Part Number

6.625

High performance 400 Pontiac connecting rod

765 7/16 2.249 .980 .994 1.140

PH6625WRB8-A


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