Big Block Chrysler 4.375 bore, 4.150 stroke, 6.760 rod, 1.860 CH, -6cc Flat Top, 1/16, 1/16, 3/16 ring (CP Bullets BM4021-055)
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|
Make |
Chrysler |
|
Engine Type |
BB Chrysler |
|
Part Number |
BM4021-055 |
|
Bore (in) |
4.375 |
|
Stroke (in) |
4.15 |
|
Rod Length (in) |
6.768 |
|
Comp Height |
1.86 |
|
Head Type |
BB Chry OC/CC |
|
Head CC |
78 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-6 |
|
Compression Ratio |
11.3 |
|
Pin |
.990 x 2.750 |
|
Ring Thickness |
1/16 x 1/16 x 3/16 in. |
|
VR Depth |
-.250 / SP |
|
Cubic Inch |
499 |
|
Piston Weight |
628 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Big Block Chrysler 4.375 bore, 4.150 stroke, 6.760 rod, 1.860 CH, -6cc Flat Top, 1/16, 1/16, 3/16 ring (CP Bullets BM4021-055) |
|---|---|
| Brands | CP Carrillo |
| Engine | Chrysler |
| Make | Chrysler |
Delivery & Freight
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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 BM4021-055 pistons?
For the BM4021-055 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, this can vary based on the specific application and operating conditions, so always consult with your engine builder for the best fit.
What compression ratio can I expect with the BM4021-055 pistons?
The BM4021-055 pistons are designed to achieve a compression ratio of approximately 11.3:1 when used with a 78cc cylinder head. Keep in mind that actual compression may vary based on head gasket thickness and other factors.
Do the BM4021-055 pistons require any special machining?
Yes, the BM4021-055 pistons may require specific machining such as honing of the cylinder bores to ensure proper clearance and fit. Always verify with your engine builder to ensure the correct machining processes are followed.
What type of rings are included with the BM4021-055 pistons?
The BM4021-055 pistons come with a ring set featuring 1/16" x 1/16" x 3/16" thickness. Ensure that the ring gaps are set according to your engine's specifications for optimal performance.
What is the weight of the BM4021-055 pistons and how does it affect performance?
The BM4021-055 pistons weigh 628 grams each. While this weight is suitable for performance applications, keep in mind that lighter pistons can reduce reciprocating mass, potentially improving engine response and RPM capabilities. Always consider the overall balance of the rotating assembly.
