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Category : Small Block Magnum (3.9/5.2/5.9) : 360/426 Stroker Kit





Small Block 426 Cubic Inch "Hemi-sized"

  This is a premium kit including forged pistons, "H" beam billet rods with ARP2000 bolts, and a forged crankshaft. Naturally, all of the correct rings, main & rod bearings are included (as you would expect from us).  This kit is internally precision race balanced.
We designed this kit for hot street/bracket racing where maximum torque is needed and a light bob weight for quick acceleration is desired. It can be installed in either the 360 "LA" block or the newer Magnum blocks that can clean up at a 4.030" bore. Oversize bores of 4.040".4.060" can be ordered by calling us or making a note in the comments section of the order screen.

The forged pistons are a step dish design giving a compression ratio of 10.45:1 with a 58cc chambered head and 9.87:1 with 65cc chambers.
For more compression ask for our flat top piston (no extra charge). Our goal in designing this was a good premium pump gas ratio with either iron or aluminum heads. The forged crankshaft will have a standard 360 main bearing with NASCAR sized rod journals (1.889"). The stroke is 4.180". The lightweight rods will use lighter weight 0.912" pin diameter and will naturally be full floating. Minimal notching will be required to allow this kit to drop in. We strongly suggest that you use our main bearing support girdle with this long armed screamer. These kits will be internally, race balanced.

Technical Data:      


  • Bore: 4.030" (4.040" bore available at no extra charge)
  • Stroke: 4.180"
  • Rod Length: 6.123"
  • Rod Weight: 628 grams
  • Main Journal:2.810"  (Also available with 340 Mains , 2.500")
  • Rod Journal: 1.988" (NASCAR size)
  • Ring Size: 1/16"-1/16"-3/16"
  • Bob Weight: 1803 grams
  • Compression Ratio with Step Dish Piston (figured with a .039"/9cc head gasket):
    58cc head = 10.45:1
    62cc head = 10"1
    64cc head = 9.87:1
  • Rod to Stroke Ratio: 1.464:1
  • Rod to block clearance: .030" in our test block with no notching. This is adequate clearance. Be sure and check your block!
  • Girdle Clearance: The rod notches in our girdle will require a chamfer on the top side to clear the rods.

     Custom pistons are available for special applications (Usually at no extra charge!) Call for info.












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