Shovelhead Cylinder Set Big Bore 3-5/8″

(12 customer reviews)


Speed And Science Big Bore (3-5/8″) Billet Aluminum Shovelhead Cylinders.


Shovelhead Cylinders Big Bore 3-5/8″ by Speed And Science®.

  • Billet Aluminum outer shell.
  • Suitable for all ’66-’84 models, this product requires engine cases to be bored out to 3.880″ in order to accept the cylinder spigots.
  • Cylinders are supplied 5.440″ long and yield 96CUI with 4-5/8″ stroke crankshafts. Longer stroke requires using stroker plates (not supplied). Shorter strokes (4-1/4 and 4-1/2) require base trimming.
  • Comes with pressed-in, centrifugally spun Grey Iron liners, undersized by -.030″ to allow for bore / hone to fit customer’s pistons. Liner’s beefy, 1/8″ wall thickness allow for all available oversized pistons.
  • Liners are replaceable, making the product infinitely rebuildable.
  • Internal, “hidden” oil drains, OEM locations top / bottom.
  • 9.2lb weight savings (p. pair) versus the all cast-iron construction.
  • Much better heat conductivity / dissipation drops the operating temperature up to 50F.
  • Warranty details and conditions are listed in the Installation Manuals ( Manuals download page )

Additional information

Weight17 lbs
Dimensions18 × 12 × 10 in

12 reviews for Shovelhead Cylinder Set Big Bore 3-5/8″

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Based on 12 reviews
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1-5 of 12 reviews
  1. Seen where some say (expensive) u get what u pay 4 these jugs are a work of art so much so that now trying to scratch together for heads got to have the icing on the cake lol

  2. Parts came in quick and look amazing!

  3. Price is high, but excellent shipping, and fast.

  4. High quality


    More full padding is needed for shipping would be my only critique for delivery.

    There was a rip in the cardboard box bottom and when I looked inside I saw the section where there is a relief cut into the cylinder fins… I let out a loud “NOOOO….!,,, WHY???!!!”

    I had thought a cooling fin was broken off by rough handling during shipment.

    But they were just fine…

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