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 4.040 Bore,3.480 stroke, 5.700 rod 10.2 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1021-040)
Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.035 Bore,3.480 stroke, 5.700 rod 10.2 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1021-035)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCRS1021-035 |
|
Bore (in) |
4.035 |
|
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 |
356 |
|
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 4.035 Bore,3.480 stroke, 5.700 rod 10.2 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1021-035) |
|---|---|
| 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 BCRS1021-035 pistons?
The BCRS1021-035 pistons are designed to achieve a compression ratio of 10.2:1 when used with a 64cc cylinder head. Ensure that your engine's specifications align with this to optimise performance.
What are the specific machining requirements for these pistons?
When installing the BCRS1021-035 pistons, ensure that the bore clearance is set correctly according to your engine's specifications. Additionally, check that the ring gaps are appropriately set based on your intended use and RPM range.
Can I use these pistons with any 23-degree head?
Yes, the BCRS1021-035 pistons are compatible with all 23-degree heads. However, verify that the head's combustion chamber volume and design match the intended compression ratio for optimal performance.
What is the weight of the BCRS1021-035 pistons, and how does it affect my engine build?
Each BCRS1021-035 piston weighs 415 grams. This weight is suitable for performance applications, but consider the overall rotating assembly balance and the impact on engine RPM and response.
What type of valve reliefs do the BCRS1021-035 pistons have?
The BCRS1021-035 pistons feature two valve reliefs on both the left and right sides. This design is essential for clearance with the valves, especially at higher RPMs, so ensure your camshaft profile is compatible.
