Harley Shovelhead, 74 cu in, 3.457 bore, 3.968 stroke, 8.5:1
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Harley Shovelhead, 74 cu in, 3.457 bore, 3.968 stroke, 8.5:1
|
Make |
Harley Davidson |
|
Engine Size |
74 CI |
|
Model |
Shovel Head |
|
Bore (in) |
3.457 |
|
Stroke (in) |
3.968 |
|
Comp Ratio |
8.5:1 |
|
Dome CC |
43.6 |
|
Comp Height |
1.44 |
|
Piston Part Number |
M5040 |
|
Conrod Part Nmber |
N/A |
|
Pint Part Number |
791-2500-14CP1C |
|
Locks Part Number |
787x050 SWL |
|
Rings |
RS1223-3457-0 |
|
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
| Product Name | Harley Shovelhead, 74 cu in, 3.457 bore, 3.968 stroke, 8.5:1 |
|---|---|
| Brands | CP Carrillo |
Delivery & Freight
We are an Australian-based company that ships items nationally and internationally, usually within 48 hours of receiving your order. High-value items shipped internationally are sent via DHL Express, while lower-value items are sent via Australia Post Express unless otherwise instructed.
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Product images are for description purposes only. Actual product may vary.
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If you are unsure, get in touch by emailing [email protected], messaging us on Facebook, or phoning us at +61 7 5645 1333 (8am to 2pm AET).
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 M5040 pistons?
For the M5040 pistons, it's crucial to maintain the correct bore clearance as specified in the supplied instructions. Typically, a clearance of 0.0025" to 0.0035" is common for performance applications, but always verify with your specific engine setup.
What type of wrist pins are included with the M5040 piston kit?
The M5040 piston kit includes high-strength wrist pins designed to withstand the demands of performance applications. Ensure that the wrist pins are properly lubricated during installation to prevent wear.
Can the M5040 pistons be used with a higher compression ratio?
While the M5040 pistons are designed for an 8.5:1 compression ratio, modifying the combustion chamber or using different cylinder heads can allow for a higher compression ratio. However, this requires careful consideration of fuel quality, tuning, and overall engine setup.
What machining processes are recommended before installing the M5040 pistons?
Before installing the M5040 pistons, ensure that the cylinder bores are honed to the correct specifications and that the ring gaps are set according to the supplied instructions. Proper machining will enhance performance and reliability.
What is the significance of the double forced pin oilers in the M5040 pistons?
The double forced pin oilers in the M5040 pistons provide enhanced lubrication to the wrist pins, reducing friction and wear during operation. This feature is particularly beneficial in high-performance applications where engine temperatures and loads are elevated.
