Big Block Chevy -2.9cc Flat Top 4.320 bore 4.000 stroke 6.135 rod, 8.2 to 1 with 118cc head (CP Bullets BBC5020-070)
Brands
CP Carrillo
Engine
Big Block Chev
Make
GM
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 BBC5020-070 pistons?
For the BBC5020-070 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, always verify with your engine builder as specific requirements may vary based on application and tolerances.
What compression ratio can I expect with the BBC5020-070 pistons and 118cc heads?
The BBC5020-070 pistons provide a compression ratio of approximately 8.1:1 when used with 118cc heads. This ratio is suitable for moderate performance applications, but tuning and fuel quality will significantly impact performance and reliability.
What type of valve reliefs do the BBC5020-070 pistons have?
The BBC5020-070 pistons feature a single valve relief with a slant design. This allows for adequate clearance with typical Big Block Chevy valve configurations, but always check your specific engine setup to ensure compatibility.
What is the weight of the BBC5020-070 pistons and how does it affect engine performance?
The BBC5020-070 pistons weigh 445 grams each. While lighter pistons can improve engine response and RPM potential, it's essential to balance them with the rest of the rotating assembly to maintain reliability and performance.
Are gas ports included in the design of the BBC5020-070 pistons?
No, the BBC5020-070 pistons do not feature gas ports. This design is typical for applications where simplicity and durability are preferred over maximum performance, making them suitable for street and moderate race engines.
