Harley Shovelhead, 74 cu in, 3.467 bore, 3.968 stroke, 8.5:1
Make
Harley Davidson
Engine Size
74 CI
Model
Shovel Head
Bore (in)
3.467
Stroke (in)
3.968
Comp Ratio
8.5:1
Dome CC
42.8
Comp Height
1.44
Piston Part Number
M5041
Conrod Part Nmber
N/A
Pint Part Number
791-2500-14CP1C
Locks Part Number
787x050 SWL
Rings
RS1223-3467-0
Shelf (RPO) or Made to Order (MTO)
MTO
Proudly made in the USA by CP Carrillo Pistons!
Fully CNC machined
Balanced to +/- 1 gram
Double forced pin oilers
Forged from high strength 2618 alloy
Designed for maximum performance, horsepower and reliability
Complete kit includes two pistons, ring sets, wrist pins and clips
Follow ring end gap and piston to cylinder clearances as per the supplied instructions
More Information
Product Name
Harley Shovelhead, 74 cu in, 3.467 bore, 3.968 stroke, 8.5:1
Brands
CP Carrillo
Delivery & Freight
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Disclaimer:
Product images are for description purposes only. Actual product may vary.
What information do I need to match these pistons to my engine?
You need the engine code, bore size, stroke, rod length, pin diameter and target compression ratio. These determine the correct piston compression height and crown design.
How should ring gaps be set for these pistons?
Ring gaps must be set by your engine builder based on fuel type, boost level and the intended rpm range. Forced-induction engines usually require larger gaps.
Are forged pistons suitable for street engines?
Yes. Forged pistons handle detonation and high cylinder pressure better than cast units. Your builder should set the piston-to-bore clearance to suit your application.
What is the recommended bore clearance for the M5041 pistons?
For the M5041 pistons, a typical bore clearance of 0.0025" to 0.0030" is recommended. This ensures proper thermal expansion and prevents piston seizure, especially under high-performance conditions.
What is the ideal ring end gap for the M5041 pistons?
The ideal ring end gap for the M5041 pistons should be set according to the specific application and expected RPM range. Generally, a gap of 0.004" to 0.005" per inch of bore is a good starting point, but always refer to the supplied instructions for precise specifications.
What type of wrist pins are included with the M5041 piston kit?
The M5041 piston kit includes high-strength wrist pins designed to match the pistons. These pins are engineered to withstand the demands of performance applications and should be installed with proper lubrication to ensure longevity.
How should I prepare the cylinder walls before installing the M5041 pistons?
Before installing the M5041 pistons, ensure the cylinder walls are properly honed to achieve the desired surface finish and clearance. A crosshatch pattern is ideal for oil retention, and the walls should be clean and free of debris to prevent scoring.
What is the significance of the dome CC of 42.8 for the M5041 pistons?
The dome CC of 42.8 for the M5041 pistons contributes to the overall compression ratio of 8.5:1. This design helps optimise combustion efficiency and power output, making it crucial to match with the appropriate cylinder head and combustion chamber specifications.
