Big Block Chrysler Flat Top -6.77cc All 15 deg Wedge 4.350 Bore , 3.750 stroke, 6.760 rod 9.86 to 1 Comp with 78cc head (CP Bullets BM4020-030)
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|
Make |
Chrysler |
|
Engine Type |
BB Chrysler |
|
Part Number |
BM4020-030 |
|
Bore (in) |
4.35 |
|
Stroke (in) |
3.75 |
|
Rod Length (in) |
6.768 |
|
Comp Height |
2.06 |
|
Head Type |
BB Chry OC/CC |
|
Head CC |
78 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-6 |
|
Compression Ratio |
10.2 |
|
Pin |
.990 x 2.750 |
|
Ring Thickness |
1/16 x 1/16 x 3/16 in. |
|
VR Depth |
-.250 / SP |
|
Cubic Inch |
446 |
|
Piston Weight |
637 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Big Block Chrysler Flat Top -6.77cc All 15 deg Wedge 4.350 Bore , 3.750 stroke, 6.760 rod 9.86 to 1 Comp with 78cc head (CP Bullets BM4020-030) |
|---|---|
| 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 and stroke for the BM4020-030 pistons?
The BM4020-030 pistons are designed for a 4.350-inch bore and a 3.750-inch stroke, making them suitable for a 446 cubic inch Big Block Chrysler engine.
What compression ratio can I expect with the BM4020-030 pistons?
These pistons provide a compression ratio of approximately 10.2:1 when used with a 78cc cylinder head. However, actual compression may vary based on specific engine assembly and machining.
Do the BM4020-030 pistons require any specific machining?
Yes, ensure the pistons are fitted with the correct bore clearance and that the ring gaps are set according to your engine's specifications. It's also advisable to check for any necessary modifications based on your specific engine setup.
What is the weight of the BM4020-030 pistons, and how does it affect performance?
The BM4020-030 pistons weigh 637 grams. While lighter pistons can improve engine response and RPM capabilities, always consider the balance of the entire rotating assembly for optimal performance.
What type of valve reliefs do the BM4020-030 pistons have?
These pistons feature two valve reliefs, which are designed to accommodate typical camshaft profiles used in Big Block Chrysler engines. Always verify clearance with your specific setup.
