Big Block Chrysler Dome +7.3cc All 15 deg Wedge 4.375 Bore , 4.150 stroke, 6.768 rod 12.7 to 1 Comp with 78cc head (CP Bullets BM4003-055)
For shipping cost -add all the products you would like, then navigate to the shopping cart to calculate shipping quote.
|
Make |
Chrysler |
|
Engine Type |
BB Chrysler |
|
Part Number |
BM4003-055 |
|
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 |
0.35 |
|
Dom/Dish CC |
7.3 |
|
Compression Ratio |
12.8 |
|
Pin |
.990 x 2.750 |
|
Ring Thickness |
1/16 x 1/16 x 3/16 in. |
|
VR Depth |
-.250 / -.250 |
|
Cubic Inch |
499 |
|
Piston Weight |
650 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Big Block Chrysler Dome +7.3cc All 15 deg Wedge 4.375 Bore , 4.150 stroke, 6.768 rod 12.7 to 1 Comp with 78cc head (CP Bullets BM4003-055) |
|---|---|
| Brands | CP Carrillo |
| Engine | Chrysler |
| Make | Chrysler |
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.
You can calculate shipping rates inside the shopping cart. After adding all the products you would like, navigate to the cart and click the ESTIMATE SHIPPING & TAX link. .
If you only see the Click and Collect shipping option, it means that your address was not validated correctly.
If you have issues calculating freight, please get in touch. We are happy to help.
Disclaimer:
Product images are for description purposes only. Actual product may vary.
Shipping calculations available at checkout.
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 compression ratio for the BM4003-055 pistons with a 78cc head?
The BM4003-055 pistons are designed to achieve a compression ratio of approximately 12.8:1 when paired with a 78cc cylinder head. Ensure that your engine's overall assembly, including combustion chamber volume and gasket thickness, is considered for accurate compression calculations.
What machining considerations should I keep in mind when using these pistons?
When installing the BM4003-055 pistons, ensure that the bore clearance is set correctly according to your engine's specifications. Additionally, check that the ring gaps are appropriate for your application, as these pistons have specific ring thicknesses and require proper fitment to avoid issues under high RPM and load.
What is the weight of the BM4003-055 pistons, and how does it affect engine balance?
The BM4003-055 pistons weigh 650 grams each. When using these pistons, it's crucial to balance the entire rotating assembly, including the crankshaft and conrods, to maintain engine performance and reliability, especially at higher RPMs.
Can I use these pistons with a different stroke or rod length?
The BM4003-055 pistons are specifically designed for a 4.150-inch stroke and a 6.768-inch rod length. Using them with different stroke or rod lengths may result in incorrect compression ratios and potential clearance issues, so it's essential to ensure compatibility with your engine's specifications.
What type of valve reliefs do the BM4003-055 pistons have?
The BM4003-055 pistons feature two valve reliefs. It's important to verify that these reliefs provide adequate clearance for your specific camshaft profile and valve sizes to prevent interference during engine operation.
