Big Block Chevy -3.4cc Flat Top 4.530 Bore 4.000 stroke 6.385 rod, 8.7 to 1 with 118cc head (CP Bullets BBC5220-030)
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|
Make |
Chevrolet |
|
Engine Type |
Big Block |
|
Part Number |
BBC5220-030 |
|
Bore (in) |
4.53 |
|
Stroke (in) |
4 |
|
Rod Length (in) |
6.135 |
|
Comp Height |
1.645 |
|
Head Type |
24 OC |
|
Head CC |
118 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-3.4 |
|
Compression Ratio |
8.5 |
|
Pin |
.990 x 2.930 |
|
Ring Thickness |
1/16 x 1/16 x 3/16 in. |
|
VR Depth |
-0.31 |
|
Cubic Inch |
516 |
|
Piston Weight |
715 |
|
Style |
FT |
|
Valve Reliefs |
1 VR with Slant |
|
Gas Port |
No |
| Product Name | Big Block Chevy -3.4cc Flat Top 4.530 Bore 4.000 stroke 6.385 rod, 8.7 to 1 with 118cc head (CP Bullets BBC5220-030) |
|---|---|
| Brands | CP Carrillo |
| Engine | Big Block Chev |
| Make | GM |
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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 BBC5220-030 pistons?
For the BBC5220-030 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. This ensures proper thermal expansion and prevents piston scuffing.
What compression ratio can I expect with the BBC5220-030 pistons and 118cc heads?
The BBC5220-030 pistons provide a compression ratio of approximately 8.7 to 1 when used with 118cc cylinder heads. However, actual compression may vary based on the specific engine assembly and machining tolerances.
What type of ring gaps should I set for the BBC5220-030 pistons?
For the BBC5220-030 pistons, a common recommendation is to set the top ring gap at 0.020" to 0.022" and the second ring gap at 0.018" to 0.020". Adjustments may be necessary based on your specific application and intended use.
What is the piston weight for the BBC5220-030, and how does it affect performance?
The BBC5220-030 pistons weigh 715 grams each. While heavier pistons can provide durability, they may also affect engine response and rev capability. Ensure your rotating assembly is balanced for optimal performance.
Are there any specific machining requirements for the BBC5220-030 pistons?
Yes, the BBC5220-030 pistons may require careful attention to bore size and ring land clearances during machining. Ensure that the cylinder bores are properly honed and that the piston-to-wall clearance is within recommended specifications for best performance.
