Pontiac 421 and Pontiac 455 Crankshafts

Molnar Technologies Pontiac 455 Crankshaft

We have an assortment of Pontiac 455 crankshaft and 421 crankshaft models to choose from and new parts are constantly under development for addition to the Molnar Technologies line of premium forged steel 421 and 455 Pontiac crankshaft offerings.

Pontiac 421 crank

Molnar Technologies superior 4340 steel Pontiac 421 and Pontiac 455 forged crankshafts are extremely strong, precision machined high performance parts and are ideal for use in high performance street cars and trucks, muscle car restorations,  and competition cars, trucks, boats and more. These cranks are available with big block Chevy size 2.200 rod pins and the stock size Pontiac 421 and 455 2.250 diameter rod pins. These Pontiac 455 forged steel crankshaft models are an excellent choice for use in building a high output, dependable 421 or 455 Pontiac engine powered vehicle.

Check out the many premium features included with each Molnar 455 Pontiac crankshaft and order today to get started on your next engine project. Check out our selection of Molnar connecting rods also and get a set of rods that will be the perfect match for your new 421 or 455 crankshaft.

Molnar Pontiac 455 Crankshaft Features

  • 4340 forged premium steel construction
  • Nitrided main and rod journal surfaces for superior wear resistance
  • Multi stage heat treatment
  • Precision machined to extremely tight tolerances
  • Material properties are monitored closely to insure optimum performance
  • Counterweight placement designed for improved crankshaft performance
  • .125" radius on both the connecting rod and main journals for increased strength
  • Precision ground and micro-polished journals
  • Chamfered oil holes for improved oiling
  • Indexed for correct stroke

These crankshafts will fit the 421 Pontiac and 455 Pontiac based engines built using these OEM engine specs as foundations when using OEM or aftermarket engine blocks.

Molnar Pontiac 421 | Pontiac 455 Crank Specs

  • Stroke Crankshaft stroke length
  • Desc Additional information about specific applications
  • Pin Crank rod pin / rod journal diameter
  • Main Main journal size
  • Min Rod Recommended minimum rod length
  • Bob Approximate bob weight
Part # and Price Stroke Desc Pin Main Min


$1228.38 $1060.95
4.000 Pontiac 421 or 455 with big block Chevy size 2.200" Rod Pins 2.200



6.535 2300


$1228.38 $1060.95
4.000 Pontiac 421 or 455 with stock size 2.250" Rod Pins 2.250



6.535 2300


If you do not find the 455 Pontiac crankshaft you need, please contact us for assistance. New models are constantly in development so we may have Pontiac forged steel cranks available that have not been added to this website yet.