Secrets Of Speed Society
Riley Crankshaft Pulleys
SOSS Members get 10% off these parts
UPDATED 8/30/2018

In the 1930’s George Riley, the famous race engine designer, discovered that stock Model "A" water pumps would spin too fast for the best rate of cooling at higher engine RPMs, like we experience in today's normal traffic. He drew up plans for this 3.56" pulley and we are pleased to offer this precision speed part to the community. 

If you drive at modern highway speeds you'll need this important part.  . . . If you race this is the one that won't explode from centrifugal  force and tired castiron. 

Our newest pulley is 5.50 inches in diameter and matches the stock pulley's mechanical specs,  

FIT FORD MODEL "A" & "B" (1928-1934)  ENGINES

  • Steel, one piece, machined from billet. "An exceptionally fine piece of equipment!" 
  • Finest quality, precision, fully CNC machined and balanced.
  • High speed design has reduced the diameter to 2-3/4" at the belt groove (3.56" OD).
  • Reduces water pump RPM approximately 28% for today's higher road speeds.
  • 10/20 degree timing marks.
  • Use normal length Vee belt OR our specially sized slightly shorter belt is available.
  • When used with an alternator normal charging occurs after a quick rev-up to 1500 rpm.
  • When used with a generator the 3rd brush can be moved to increase charge.
  • Additionally, our steel Riley pulleys will not explode or crack like cast iron pulleys can in high speed environments.
  • Be safe, it’s required for hill climbs, racing and over revving situations by serious professionals.
  • The front oil seal will last much longer with a steel pulley.
  • These are NOT cheap soft aluminum pulleys that allow the front crank oil seal to seriously cut into the pulley shank.

Crankshaft Pulley - STEEL Single                                                                                                    
$99.95                IN STOCK
  • Comes with grade 8 bolt and washer.
  • Black Oxide coating
  • 5/8" Belt - 3.5" diameter (our best seller)

Crankshaft Pulley  -  STEEL Dual                                                                                         
$122.95                           IN STOCK
  • Commonly used with air-conditioning.
  • Comes with grade 8 bolt and washer.
  • Black oxide coating.
  • 5/8" & 3/8" belt - 3.5" diameter (stock size)
Crankshaft Pulley  -  STEEL Single   LARGE  5.5"  DIA.                                                  
 $148.95                              IN STOCK  
  • Comes with grade 8 bolt and washer
  • Black Oxide Coating. 
  • 5/8" belt - 5.50" diameter (stock size)
  • Also, we have this pulley in DUAL 5/8" belt:   ​Dual $ 280.00  IN  STOCK
Crankshaft Pulley  -  STEEL Dual  5/8" belts - 3.5" Diameter -  SPECIAL ORDER                        
  • We do NOT normally stock these, but some customers have been using them to drive a variety of equipment like: Blowers, air conditioning, power steering, etc.
  • Black Oxide coating.
  • Expect 3 to 6 week production time.

Mounting Bolt Washer Set   - Replacement Part                                                                    
$9.95                        IN STOCK
  • Grade 8 Bolt is to be torqued to 125 foot pounds of torque.
  • This set comes with each pulley.             

Vee Belt (CP-V39)                                                                                                                    
$17.95            IN STOCK

Our OPTIONAL smaller Vee belt (42") will take up the combined slack of an alternator's small pulley and our 3.50" crank pulley.

​Questions? Please call 513-724-0700
Order send an email with what you want along with your full name and billing/shipping address.
​We will send back an invoice to pay from. . . Or call our office (513) 724-0700 EST, USA
Scalded Dog Speed Parts, 3860 Cain Run Rd, Batavia OH 45103. Phone 513-724-0700, email