Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.000 Bore,3.500 stroke, 6.000 rod 10.1 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1020-STD)
Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.030 Bore,3.500 stroke, 6.000 rod 10.3 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1020-030)
Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.030 Bore,3.480 stroke, 5.700 rod 10.2 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1021-030)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCRS1021-030 |
|
Bore (in) |
4.03 |
|
Stroke (in) |
3.48 |
|
Rod Length (in) |
5.7 |
|
Comp Height |
1.56 |
|
Head Type |
All 23 deg heads |
|
Head CC |
64 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-4.95 |
|
Compression Ratio |
10.2 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.310 / SP |
|
Cubic Inch |
355 |
|
Piston Weight |
415 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's R/L |
|
Gas Port |
No |
| Product Name | Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.030 Bore,3.480 stroke, 5.700 rod 10.2 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1021-030) |
|---|---|
| Brands | CP Carrillo |
| Engine | SB Chevrolet / Holden |
| Make | GM |
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 compression ratio for the BCRS1021-030 pistons?
The BCRS1021-030 pistons are designed to achieve a compression ratio of 10.2:1 when used with a 64cc cylinder head. Ensure that your engine's actual compression ratio is verified after assembly, as it can be influenced by factors such as head gasket thickness and machining.
What type of cylinder heads are compatible with these pistons?
These pistons are compatible with all 23-degree cylinder heads. It's important to verify that the head design and combustion chamber volume align with the specifications of the BCRS1021-030 pistons to achieve optimal performance.
What are the specific machining requirements for these pistons?
When installing the BCRS1021-030 pistons, ensure that the bore clearance is set correctly according to your engine's specifications. Additionally, check that the ring gaps are appropriately set for the intended application, as this can affect engine performance and reliability.
What is the weight of the BCRS1021-030 pistons, and how does it affect engine performance?
The BCRS1021-030 pistons weigh 415 grams each. While lighter pistons can improve engine response and reduce rotating mass, it's crucial to balance them with the rest of the rotating assembly to maintain engine reliability and performance.
Are there any specific installation tips for the BCRS1021-030 pistons?
When installing the BCRS1021-030 pistons, ensure that the piston pin is properly lubricated and that the piston is oriented correctly in relation to the valve reliefs. Always follow the manufacturer's guidelines for installation to avoid any potential issues during operation.
